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Tri-gear Flap Cross Tube Slot Length

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tonyrenshaw268(at)gmail.c
Guest

Posted: Sun Jul 28, 2013 4:12 pm Post subject: Tri-gear Flap Cross Tube Slot Length

Gidday,

Building a taildragger version I am not constrained by gear/flap geometry to determine the flap I can deploy, since they will be electric. I feel I recall the tricycle undercarriage versions can deploy 30 degrees of flap and I was wondering if someone with that amount could measure the length of their slots as a guide whilst I remove the fuse material. I don't have the cross tube connected to the flap motor as yet, and am doing it by sanding the slots incrementally as I lower the flaps, as I didn't trust myself with the jig I made up. (I'm getting tired of fixing my mistakes). 

Thanks in advance.

Regards

Tony Renshaw

Sydney Aussie

rparigoris

Joined: 24 Nov 2009
Posts: 796

Posted: Sun Jul 28, 2013 4:53 pm Post subject: Re: Tri-gear Flap Cross Tube Slot Length

Hi Tony



I just did this job on my Mono and will explain the way I did it, which seems to be a good way to do it, but first:



I have read that if you drop the flaps more than the book value of 27 degrees (target is 26-27, do not exceed 27), that yes you will produce a little more lift (and drag), but you can become airborne with ailerons that are less than effective. I think the factory mentioned this in older Tech Talk. Check with others. I am only speaking from what I read, not someone who has flown with more. For me no more than 27 degrees.



Now for flap cross tube slot, I took a 1/2"steel rod, about 6" long and bored a hole in it the precise diameter of the flap drive pin. I then made a slot 3/4" in diameter to allow 27 degrees of flap travel with the 1/2" rod on the flap drive pin sticking inside the fuse.



Then I turned a piece of aluminium that's the diameter of the flap cross tube, about 1.25" long (plus two thicknesses of 80 grit sandpaper), with one side cut at a 30 degree angle and then bored a 1/2" hole in the center where this is now a nice slip fit onto my 1/2" rod. 



Now with a helper, I threw the flap from retracted to 27 degrees with the 1/2" rod on the flap drive pin and with the 30 degree angle of the aluminium rod set on the 1/2" rod, just used the point of the tip of the 30 degree angle pushed against the fuse and traced with a pencil the needed slot.



Mind you this is not a perfect slot because the flap drive pin is not perpendicular with the fuse, but close enough to allow full throw without going "too much".



It ends up that a closet wood pole is the same diameter as the flap cross tube, so I just stuck some 80 grit and had a terrific sanding bar.



Once I have everything set up exactly as I want and can cycle the gear, or in your case actuate the motor, I will just take a carpenters pencil, cut down to about an inch long and sharpened to give desired clearance, and mark the fuse by resting the pencil on the flap cross tube, using the flap cross tube as a guide. By using the flap cross tube as a guide, this will make the perfect mark to follow.



Ron Parigoris

grahamsingleton(at)btinte
Guest

Posted: Mon Jul 29, 2013 1:26 am Post subject: Tri-gear Flap Cross Tube Slot Length

Tony

don't use 30 degree flap, Europa tested it and found you are starting to lose aileron control at the low speeds achieved in ground effect.

Graham

        From: Tony Renshaw <tonyrenshaw268(at)gmail.com>

 To: "europa-list(at)matronics.com" <europa-list(at)matronics.com> 

 Sent: Monday,  29 July 2013, 1:11

 Subject: Tri-gear Flap Cross Tube Slot Length

--> Europa-List message posted by: Tony Renshaw <tonyrenshaw268(at)gmail.com (tonyrenshaw268(at)gmail.com)>

Gidday,

Building a taildragger version I am not constrained by gear/flap geometry to determine the flap I can deploy, since they will be electric. I feel I recall the tricycle undercarriage versions can deploy 30 degrees of flap and I was wondering if someone with that amount could measure the length of their slots as a guide whilst I remove the fuse material. I don't have the cross tube connected to the flap motor as yet, and am doing it by sanding the slots incrementally as I lower the flaps, as I didn't trust myself with the jig I made up. (I'm getting tired of fixing my mistakes). 

Thanks //www.matronics.com/Navigator?Europa-List" target="_blank">http://www.mat=   -->  [quote][b]

frans(at)privatepilots.nl
Guest

Posted: Tue Jul 30, 2013 1:24 am Post subject: Tri-gear Flap Cross Tube Slot Length

On 07/29/2013 11:25 AM, GRAHAM SINGLETON wrote:



 	  Quote: 	
		   don't use 30 degree flap, Europa tested it and found you are starting to

 lose aileron control at the low speeds achieved in ground effect.


	


I have some trouble believing this (and even when it is true it is

questionable whether this is still a valid reason for the XS with the

increased aileron span and with more powerfull engines).



With higher flap settings you are getting more drag than additional

lift. With 10% more flap (30 degree instead of 27) you will get maybe

just 5% more lift. If the ailerons are inadequate for this tiny bit of

extra lift I think they would have difficulties handling 27 degrees as

well. Furthermore, in the XS the ailerons are substantially increased in

lenght, significantly more than 5%, and should have much more control

power at low speeds! Even if control problems were the limiting factor,

than it is questionable whether the same limit would still be needed for

the XS.



I thought that the limitation in flap was because of the 80hp engine

used for the certification, which might have lacked sufficient power to

exercise a go around with full flaps under full load (which is, if I

remember correctly, a certification requirement. For the same reason the

older Cessna's have 40 degree flaps, where the newer ones have 30 degree

which was instantly rewarded with a 30Kg higher MTOW without any

structural changes).



Furthermore, in the tri gear the fact that you have the option to use 30

degree flaps doesn't mean that you will have to use this all the time.

There are situations where more flap would be welcome, and there might

be situations where using less flap would be better. I can't see the

benefit of the 26 degree limit. Of course for the mono you have no other

option than to land with full flaps, so maybe in this case the

limitation is justified.



I know folks having drilled a new hole in the lugs on the flap control

tube, so that the actuator can drive the flap further (and faster). No

control difficulties are observed even in quite a few nasty situations

with 30 knots wind and lots of turbulence. Instead the short field

capabilities are somewhat improved.



Regards,

Frans

grahamsingleton(at)btinte
Guest

Posted: Tue Jul 30, 2013 1:29 am Post subject: Tri-gear Flap Cross Tube Slot Length

Frans

I was talking about monowheel in ground effect.

Graham



        From: Frans Veldman <frans(at)privatepilots.nl>

 To: europa-list(at)matronics.com 

 Sent: Tuesday, 30 July 2013, 10:23

 Subject: Re: Tri-gear Flap Cross Tube Slot Length

  

 

--> Europa-List message posted by: Frans Veldman <frans(at)privatepilots.nl (frans(at)privatepilots.nl)>



On 07/29/2013 11:25 AM, GRAHAM SINGLETON wrote:



 	  Quote: 	
		   don't use 30 degree flap, Europa tested it and found you are starting to

 lose aileron control at the low speeds achieved in ground effect.


	


I have some trouble believing this (and even when it is true it is

questionable whether this is still a valid reason for the XS with the

increased aileron span and with more powerfull engines).



With higher flap settings you are getting more drag than additional

lift. With 10% more flap (30 degree instead of 27) you will get maybe

just 5% more lift. If the ailerons are inadequate for this tiny bit of

extra lift I think they would have difficulties handling 27 degrees as

well. Furthermore, in the XS the ailerons are substantially increased in

lenght, significantly more than 5%, and should have much more  control

power at low speeds! Even if control problems were the limiting factor,

than it is questionable whether the same limit would still be needed for

the XS.



I thought that the limitation in flap was because of the 80hp engine

used for the certification, which might have lacked sufficient power to

exercise a go around with full flaps under full load (which is, if I

remember correctly, a certification requirement. For the same reason the

older Cessna's have 40 degree flaps, where the newer ones have 30 degree

which was instantly rewarded with a 30Kg higher MTOW without any

structural changes).



Furthermore, in the tri gear the fact that you have the option to use 30

degree flaps doesn't mean that you will have to use this all the time.

There are situations where more flap would be welcome, and there might

be situations where using less flap would be better. I can't see the

benefit of the 26 degree  limit. Of course for the mono you have no other

option than to land with full flaps, so maybe in this case the

limitation is justified.



I know folks having drilled a new hole in the lugs on the flap control

tube, so that the actuator can drive the flap further (and faster). No

control difficulties are observed even in quite a few nasty situations

with 30 knots wind and lots of turbulence. Instead the short field

capabili//www.matronics.com/Navigator?Europa-List" ="http://forums.matronics.com/" target="_blank">http://forums.matronics                    &nbsptronics.com/contribution" target="_blank">http://www.matronics.com/contri================

 

  

  

 [quote][b]

ivanshaw(at)btinternet.co
Guest

Posted: Tue Jul 30, 2013 4:19 am Post subject: Tri-gear Flap Cross Tube Slot Length

I tested the flaps down to 40 degrees, ailerons worked just fine.

Ivan



--

grahamsingleton(at)btinte
Guest

Posted: Tue Jul 30, 2013 5:15 am Post subject: Tri-gear Flap Cross Tube Slot Length

Not what you told me re the monowheel!

G



        From: Ivan Shaw <ivanshaw(at)btinternet.com>

 To: europa-list(at)matronics.com 

 Sent: Tuesday, 30 July 2013, 13:18

 Subject: RE: Tri-gear Flap Cross Tube Slot Length

  

 

--> Europa-List message posted by: "Ivan Shaw" <ivanshaw(at)btinternet.com (ivanshaw(at)btinternet.com)>



I tested the flaps down to 40 degrees, ailerons worked just fine.

Ivan



--

nigel_graham(at)m-tecque.
Guest

Posted: Wed Jul 31, 2013 4:42 am Post subject: Tri-gear Flap Cross Tube Slot Length

A fascinating insight into the reasoning behind the recommendation for 

the optimum flap setting can be found on page three of this early 

factory newsletter, dated March 1994.

This did of course relate to the first prototype, G-YURO, which was 

powered by the 80 horse 912 driving a fixed pitch Warp Drive prop.

Happy days. The enthusiasm and excitement was palpable.  Isn't it time 

somebody developed a new homebuild?

Nigel

On 30/07/2013 10:23, Frans Veldman wrote:

 	  Quote: 	

 On 07/29/2013 11:25 AM, GRAHAM SINGLETON wrote:

> don't use 30 degree flap, Europa tested it and found you are starting to

> lose aileron control at the low speeds achieved in ground effect.

 I have some trouble believing this (and even when it is true it is

 questionable whether this is still a valid reason for the XS with the

 increased aileron span and with more powerfull engines).

 With higher flap settings you are getting more drag than additional

 lift. With 10% more flap (30 degree instead of 27) you will get maybe

 just 5% more lift. If the ailerons are inadequate for this tiny bit of

 extra lift I think they would have difficulties handling 27 degrees as

 well. Furthermore, in the XS the ailerons are substantially increased in

 lenght, significantly more than 5%, and should have much more control

 power at low speeds! Even if control problems were the limiting factor,

 than it is questionable whether the same limit would still be needed for

 the XS.

 I thought that the limitation in flap was because of the 80hp engine

 used for the certification, which might have lacked sufficient power to

 exercise a go around with full flaps under full load (which is, if I

 remember correctly, a certification requirement. For the same reason the

 older Cessna's have 40 degree flaps, where the newer ones have 30 degree

 which was instantly rewarded with a 30Kg higher MTOW without any

 structural changes).

 Furthermore, in the tri gear the fact that you have the option to use 30

 degree flaps doesn't mean that you will have to use this all the time.

 There are situations where more flap would be welcome, and there might

 be situations where using less flap would be better. I can't see the

 benefit of the 26 degree limit. Of course for the mono you have no other

 option than to land with full flaps, so maybe in this case the

 limitation is justified.

 I know folks having drilled a new hole in the lugs on the flap control

 tube, so that the actuator can drive the flap further (and faster). No

 control difficulties are observed even in quite a few nasty situations

 with 30 knots wind and lots of turbulence. Instead the short field

 capabilities are somewhat improved.

 Regards,

 Frans

1994_-_Q1_-_Issue_7.pdf

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grahamsingleton(at)btinte
Guest

Posted: Wed Jul 31, 2013 5:22 am Post subject: Tri-gear Flap Cross Tube Slot Length

Thanks for that Nigel

As you say, fascinating! I'm glad my memory is not so innacuarate after all!

Graham

        From: "nigel_graham(at)m-tecque.co.uk" <nigel_graham(at)m-tecque.co.uk>

 To: europa-list(at)matronics.com 

 Sent: Wednesday, 31 July 2013, 13:42

 Subject: Re: Tri-gear Flap Cross Tube Slot Length

A fascinating insight  into the reasoning behind the recommendation for 

the optimum flap setting can be found on page three of this early 

factory newsletter, dated March 1994.

This did of course relate to the first prototype, G-YURO, which was 

powered by the 80 horse 912 driving a fixed pitch Warp Drive prop.

Happy days. The enthusiasm and excitement was palpable.  Isn't it time 

somebody developed a new homebuild?

Nigel

On 30/07/2013 10:23, Frans Veldman wrote:

 	  Quote: 	
		   --> Europa-List message posted by: Frans Veldman <frans(at)privatepilots.nl (frans(at)privatepilots.nl)>

 On 07/29/2013 11:25 AM, GRAHAM SINGLETON wrote:

> don't use 30 degree flap, Europa tested it and found you are starting to

> lose aileron control at the low speeds achieved in ground effect.

 I have some trouble believing this (and even when it  is true it is

 questionable whether this is still a valid reason for the XS with the

 increased aileron span and with more powerfull engines).

 With higher flap settings you are getting more drag than additional

 lift. With 10% more flap (30 degree instead of 27) you will get maybe

 just 5% more lift. If the ailerons are inadequate for this tiny bit of

 extra lift I think they would have difficulties handling 27 degrees as

 well. Furthermore, in the XS the ailerons are substantially increased in

 lenght, significantly more than 5%, and should have much more control

 power at low speeds! Even if control problems were the limiting factor,

 than it is questionable whether the same limit would still be needed for

 the XS.

 I thought that the limitation in flap was because of the 80hp engine

 used for the certification, which might have lacked  sufficient power to

 exercise a go around with full flaps under full load (which is, if I

 remember correctly, a certification requirement. For the same reason the

 older Cessna's have 40 degree flaps, where the newer ones have 30 degree

 which was instantly rewarded with a 30Kg higher MTOW without any

 structural changes).

 Furthermore, in the tri gear the fact that you have the option to use 30

 degree flaps doesn't mean that you will have to use this all the time.

 There are situations where more flap would be welcome, and there might

 be situations where using less flap would be better. I can't see the

 benefit of the 26 degree limit. Of course for the mono you have no other

 option than to land with full flaps, so maybe in this case the

 limitation is justified.

 I know folks having drilled a new hole in the lugs on the flap control

  tube, so that the actuator can drive the flap further (and faster). No

 control difficulties are observed even in quite a few nasty situations

 with 30 knots wind and lots of turbulence. Instead the short field

 capabilities are somewhat improved.

 Regards,

 Frans

 [quote][b]

ivanshaw(at)btinternet.co
Guest

Posted: Wed Jul 31, 2013 5:27 am Post subject: Tri-gear Flap Cross Tube Slot Length

Looks like mine is!!

Ivan

From: owner-europa-list-server(at)matronics.com [mailto:owner-europa-list-server(at)matronics.com] On Behalf Of GRAHAM SINGLETON

Sent: 31 July 2013 14:22

To: europa-list(at)matronics.com

Subject: Re: Tri-gear Flap Cross Tube Slot Length

Thanks for that Nigel

As you say, fascinating! I'm glad my memory is not so innacuarate after all!

Graham

From: "nigel_graham(at)m-tecque.co.uk (nigel_graham(at)m-tecque.co.uk)" <nigel_graham(at)m-tecque.co.uk (nigel_graham(at)m-tecque.co.uk)>

To: europa-list(at)matronics.com (europa-list(at)matronics.com) 

Sent: Wednesday, 31 July 2013, 13:42

Subject: Re: Tri-gear Flap Cross Tube Slot Length

A fascinating insight into the reasoning behind the recommendation for 

the optimum flap setting can be found on page three of this early 

factory newsletter, dated March 1994.

This did of course relate to the first prototype, G-YURO, which was 

powered by the 80 horse 912 driving a fixed pitch Warp Drive prop.

Happy days. The enthusiasm and excitement was palpable.  Isn't it time 

somebody developed a new homebuild?

Nigel

On 30/07/2013 10:23, Frans Veldman wrote:

 	  Quote: 	
		   --> Europa-List message posted by: Frans Veldman <frans(at)privatepilots.nl (frans(at)privatepilots.nl)>

 On 07/29/2013 11:25 AM, GRAHAM SINGLETON wrote:

> don't use 30 degree flap, Europa tested it and found you are starting to

> lose aileron control at the low speeds achieved in ground effect.

 I have some trouble believing this (and even when it is true it is

 questionable whether this is still a valid reason for the XS with the

 increased aileron span and with more powerfull engines).

 With higher flap settings you are getting more drag than additional

 lift. With 10% more flap (30 degree instead of 27) you will get maybe

 just 5% more lift. If the ailerons are inadequate for this tiny bit of

 extra lift I think they would have difficulties handling 27 degrees as

 well. Furthermore, in the XS the ailerons are substantially increased in

 lenght, significantly more than 5%, and should have much more control

 power at low speeds! Even if control problems were the limiting factor,

 than it is questionable whether the same limit would still be needed for

 the XS.

 I thought that the limitation in flap was because of the 80hp engine

 used for the certification, which might have lacked sufficient power to

 exercise a go around with full flaps under full load (which is, if I

 remember correctly, a certification requirement. For the same reason the

 older Cessna's have 40 degree flaps, where the newer ones have 30 degree

 which was instantly rewarded with a 30Kg higher MTOW without any

 structural changes).

 Furthermore, in the tri gear the fact that you have the option to use 30

 degree flaps doesn't mean that you will have to use this all the time.

 There are situations where more flap would be welcome, and there might

 be situations where using less flap would be better. I can't see the

 benefit of the 26 degree limit. Of course for the mono you have no other

 option than to land with full flaps, so maybe in this case the

 limitation is justified.

 I know folks having drilled a new hole in the lugs on the flap control

 tube, so that the actuator can drive the flap further (and faster). No

 control difficulties are observed even in quite a few nasty situations

 with 30 knots wind and lots of turbulence. Instead the short field

 capabilities are somewhat improved.

 Regards,

 Frans

 	  Quote: 	
		    http://www.matronics.com/Navigator?Europa-List 	
0 	  Quote: 	

1 	  Quote: 	

2 	  Quote: 	

3 	  Quote: 	

4 	  Quote: 	

5 	  Quote: 	

6 	  Quote: 	

7

   [quote][b]

nigel_graham(at)m-tecque.
Guest

Posted: Wed Jul 31, 2013 5:28 am Post subject: Tri-gear Flap Cross Tube Slot Length

I felt you needed a bit of support 

     

     N

     

     On 31/07/2013 14:22, GRAHAM SINGLETON       wrote:

     

     [quote]       Thanks for that Nigel

         As you say, fascinating! I'm glad my memory is not so         innacuarate after all!

         Graham

         

         

         

                                                  From:                 "nigel_graham(at)m-tecque.co.uk" (nigel_graham(at)m-tecque.co.uk)                 <nigel_graham(at)m-tecque.co.uk> (nigel_graham(at)m-tecque.co.uk)

                 To:                 europa-list(at)matronics.com (europa-list(at)matronics.com) 

                 Sent:                 Wednesday, 31 July 2013, 13:42

                 Subject:                 Re: Tri-gear Flap Cross Tube Slot Length

                

             

               A fascinating insight into the reasoning behind the               recommendation for 

               the optimum flap setting can be found on page three of               this early 

               factory newsletter, dated March 1994.

               This did of course relate to the first prototype, G-YURO,               which was 

               powered by the 80 horse 912 driving a fixed pitch Warp               Drive prop.

               

               Happy days. The enthusiasm and excitement was palpable.                Isn't it time 

               somebody developed a new homebuild?

               

               Nigel

               

               

               

               On 30/07/2013 10:23, Frans Veldman wrote:

               > --> Europa-List message posted by: Frans Veldman               <frans(at)privatepilots.nl (frans(at)privatepilots.nl)>

               >

               > On 07/29/2013 11:25 AM, GRAHAM SINGLETON wrote:

               >

               >> don't use 30 degree flap, Europa tested it and               found you are starting to

               >> lose aileron control at the low speeds achieved               in ground effect.

               > I have some trouble believing this (and even when it               is true it is

               > questionable whether this is still a valid reason for               the XS with the

               > increased aileron span and with more powerfull               engines).

               >

               > With higher flap settings you are getting more drag               than additional

               > lift. With 10% more flap (30 degree instead of 27)               you will get maybe

               > just 5% more lift. If the ailerons are inadequate for               this tiny bit of

               > extra lift I think they would have difficulties               handling 27 degrees as

               > well. Furthermore, in the XS the ailerons are               substantially increased in

               > lenght, significantly more than 5%, and should have               much more control

               > power at low speeds! Even if control problems were               the limiting factor,

               > than it is questionable whether the same limit would               still be needed for

               > the XS.

               >

               > I thought that the limitation in flap was because of               the 80hp engine

               > used for the certification, which might have lacked               sufficient power to

               > exercise a go around with full flaps under full load               (which is, if I

               > remember correctly, a certification requirement. For               the same reason the

               > older Cessna's have 40 degree flaps, where the newer               ones have 30 degree

               > which was instantly rewarded with a 30Kg higher MTOW               without any

               > structural changes).

               >

               > Furthermore, in the tri gear the fact that you have               the option to use 30

               > degree flaps doesn't mean that you will have to use               this all the time.

               > There are situations where more flap would be               welcome, and there might

               > be situations where using less flap would be better.               I can't see the

               > benefit of the 26 degree limit. Of course for the               mono you have no other

               > option than to land with full flaps, so maybe in this               case the

               > limitation is justified.

               >

               > I know folks having drilled a new hole in the lugs on               the flap control

               > tube, so that the actuator can drive the flap further               (and faster). No

               > control difficulties are observed even in quite a few               nasty situations

               > with 30 knots wind and lots of turbulence. Instead               the short field

               > capabilities are somewhat improved.

               >

               > Regards,

               > Frans

               >

               >

               >

               >

               >

               >

               

               

               

             

           

         

       

        	  Quote: 	
		  

	
     [b]

grahamsingleton(at)btinte
Guest

Posted: Wed Jul 31, 2013 5:30 am Post subject: Tri-gear Flap Cross Tube Slot Length

Old age I guess! {{ now you know how I feel!

G



        From: Ivan Shaw <ivanshaw(at)btinternet.com>

 To: europa-list(at)matronics.com 

 Sent: Wednesday, 31 July 2013, 14:27

 Subject: RE: Tri-gear Flap Cross Tube Slot Length

  

 

Looks like mine is!!

  

Ivan

  

From: owner-europa-list-server(at)matronics.com [mailto:owner-europa-list-server(at)matronics.com] On Behalf Of GRAHAM SINGLETON

Sent: 31 July 2013 14:22

To: europa-list(at)matronics.com

Subject: Re: Tri-gear Flap Cross Tube Slot Length

  

Thanks for that Nigel

As you say, fascinating! I'm glad my memory is not so innacuarate after all!

Graham

  

From: "nigel_graham(at)m-tecque.co.uk (nigel_graham(at)m-tecque.co.uk)" <nigel_graham(at)m-tecque.co.uk (nigel_graham(at)m-tecque.co.uk)>

To: europa-list(at)matronics.com (europa-list(at)matronics.com) 

Sent: Wednesday, 31 July 2013, 13:42

Subject: Re:  Tri-gear Flap Cross Tube Slot Length

A fascinating insight into the reasoning behind the recommendation for 

the optimum flap setting can be found on page three of this early 

factory newsletter, dated March 1994.

This did of course relate to the first prototype, G-YURO, which was 

powered by the 80 horse 912 driving a fixed pitch Warp Drive prop.



Happy days. The enthusiasm and excitement was palpable.  Isn't it time 

somebody developed a new homebuild?



Nigel



On 30/07/2013 10:23, Frans Veldman wrote:

 	  Quote: 	
		   --> Europa-List message posted by: Frans Veldman <frans(at)privatepilots.nl (frans(at)privatepilots.nl)>



 On  07/29/2013 11:25 AM, GRAHAM SINGLETON wrote:



> don't use 30 degree flap, Europa tested it and found you are starting to

> lose aileron control at the low speeds achieved in ground effect.

 I have some trouble believing this (and even when it is true it is

 questionable whether this is still a valid reason for the XS with the

 increased aileron span and with more powerfull engines).



 With higher flap settings you are getting more drag than additional

 lift. With 10% more flap (30 degree instead of 27) you will get maybe

 just 5% more lift. If the ailerons are inadequate for this tiny bit of

 extra lift I think they would have difficulties handling 27 degrees as

 well. Furthermore, in the XS the ailerons are substantially increased in

 lenght, significantly more than 5%, and should have much more control

 power at low speeds! Even if control problems  were the limiting factor,

 than it is questionable whether the same limit would still be needed for

 the XS.



 I thought that the limitation in flap was because of the 80hp engine

 used for the certification, which might have lacked sufficient power to

 exercise a go around with full flaps under full load (which is, if I

 remember correctly, a certification requirement. For the same reason the

 older Cessna's have 40 degree flaps, where the newer ones have 30 degree

 which was instantly rewarded with a 30Kg higher MTOW without any

 structural changes).



 Furthermore, in the tri gear the fact that you have the option to use 30

 degree flaps doesn't mean that you will have to use this all the time.

 There are situations where more flap would be welcome, and there might

 be situations where using less flap would be better. I can't see the

  benefit of the 26 degree limit. Of course for the mono you have no other

 option than to land with full flaps, so maybe in this case the

 limitation is justified.



 I know folks having drilled a new hole in the lugs on the flap control

 tube, so that the actuator can drive the flap further (and faster). No

 control difficulties are observed even in quite a few nasty situations

 with 30 knots wind and lots of turbulence. Instead the short field

 capabilities are somewhat improved.



 Regards,

 Frans


	


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