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cowl cutting - bak edge

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graeme bird

Joined: 15 Jul 2010
Posts: 434

Posted: Sun Mar 06, 2011 12:39 pm Post subject: cowl cutting - bak edge

before I cut the back edge of the XS cowl for a 912S I'd like to check that its normal to take about 2mm off the port side and 12 mm off the starboard. I realise the engine is 1.5 off to starboard but I dont know if the cowl design caters for this already. My engine didnt need any adjustment washers and I measured the angle at 1.57 deg.

Thanks

_________________
Graeme Bird
kit4 (Wagstaff) TBD
Kit3 G-CLXU (Gregory) mono 914 xs Woodcomp
Kit2 G-PATS - (kesterton) Mono Classic 912 warpdrive
Kit 1 G-UMPY - Mono Classic/XS 912S, Woodcomp G(@)gdbmk.co.uk

budyerly(at)msn.com
Guest

Posted: Sun Mar 06, 2011 4:40 pm Post subject: cowl cutting - bak edge

<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->  If you didn't need washers, you installed the mount perfectly.

 As for the cut of the rear, you bet it is not uncommon to cut the right  side more than the other.

  For offset, I just do the angle of 1 1/16 inch at 20 inches to make the  angle and it is remarkably close.



 The cowl actually has a bit of P factor lean on the forward  flange. 

  

 Before you cut, be sure to have the exhaust fitted and your propeller  flange mounted as you may find it necessary to push the cowl forward a bit for  more clearance and or to get that look just right.  Also the exhaust often  needs a bit of adjustment left or right/fore or aft to get the clearance just  right.

 As for the cowl:

 As you cut, the cowl drops down into the rebate and changes everything  during the fitting.  To get it just right, I put two inch tape on the  fuselage rebate line.  Now I have a line that is exactly 2 inches  longer than the cowl line.  If I push the cowl to the spinner, I then  scribe my cowl using the end of the tape by using a compass and pen.  OK, I  know the cowl is now 1/8 too long as is up against the spinner  backplate.  A spinner back plate to cowl clearance of 1/8 inch looks  very nice.  So all you have to do is cut another 1/8 inch off.   Occasionally, there is a difference from the top to the bottom with the  sides fine.  Filler works.  Then put a 2 oz. cloth over the filler so  it won't crack and flick off.  That is a heck of a surprise in  flight. 

 Some use a technique to leave the spinner a bit high at first as the engine  settles believe it or not.  I use 1/16 inch on initial fit if it has been a  while, then re-level the engine again before final drill of the cowl.

  

 When the cowl is fitted on the floor for smooth sides, it will occasionally  pucker on one or both sides between your clecos when installed on the plane  (I start with 3/32 inch then go up in increments).  Gravity works 24/7  and you will note that the sag in the cowl due to gravity will pull the  nose down a bit and this causes puckers in the side.  Once the cowl fits  inside the rebate, I work the cowl sides to tart from the front and  push the most forward pucker in and re-drill the cleco hole  and go aft to the next pucker.  It cuts down on filler....    

  

 Best regards.

  

 Bud Yerly

 [quote]   ---

graeme bird

Joined: 15 Jul 2010
Posts: 434

Posted: Tue Mar 08, 2011 10:54 am Post subject: Re: cowl cutting - bak edge

thanks Bud, I think I get the drift of most of it, one thing worries me now though is that you mention a spinner to cowl gap of 1/8th I just don't have enough cowl to do that, I am going to end up with around 1/2". The top is resting on the shaft of the 912S prop plate butted up to the back of the prop bolts and I only have 1/8th of the cowl on the port side to cut off. Is a 3/8th gap going to matter? 



Regards Graeme

grahamsingleton(at)btinte
Guest

Posted: Tue Mar 08, 2011 12:38 pm Post subject: cowl cutting - bak edge

Not really, but it won't look nice and that will upset you more and more over the years

Graham

From: graeme bird <graeme(at)gdbmk.co.uk>

To: europa-list(at)matronics.com

Sent: Tuesday, 8 March, 2011 18:55:01

Subject: Re: cowl cutting - bak edge

--> Europa-List message posted by: "graeme bird" <graeme(at)gdbmk.co.uk (graeme(at)gdbmk.co.uk)>

thanks Bud, I think I get the drift of most of it, one thing worries me now though is that you mention a spinner to cowl gap of 1/8th I just don't have enough cowl to do that, I am going to end up with around 1/2". The top is resting on the shaft of the 912S prop plate butted up to the back of the prop bolts and I only have 1/8th of the cowl on the port side to cut off. Is a 3/8th gap going to matter? 

Regards Graeme

--------

Graeme Bird

G-UMPY

Mono Classic/XS FWFD 912ULS/Warp drive FP

Build nearing completion

Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=333194#333194

         - The Europa-List atronics.com/Navigator?Europa-List" target="_blank">http://www.matronics.                   -Matt Drallontribution" target="_blank">http://www.matronics.com/contribution<br===========

graeme bird

Joined: 15 Jul 2010
Posts: 434

Posted: Tue Mar 08, 2011 1:22 pm Post subject: Re: cowl cutting - back edge

Graham, checking again I am compliant with the 1" back from the front of the flange as it says in the manual, so it must be the spinner that doesnt come back enough.

neveyre(at)aol.co.uk
Guest

Posted: Tue Mar 08, 2011 1:26 pm Post subject: cowl cutting - bak edge

Hi Graeme,

   If I read it correctly, you haven't fitted the spinner backplate to the front face of the engine prop flange yet ? Bolt the spinner backplate on.

   The spinner backplate is about 1'' deep, shim that with 3 mixing sticks between the rear of the spinner backplate to the front of the cowl, there is your overlap onto the fuselage !

   I use a similar process to Bud, tape the fuselage with masking tape.Mark a line at the fuselage joggle of the cowl line edge and use a flexi ruler or similar spline,to mark a line paralell to the joggle line the width of the ruler aft.

   Fit the top cowl with the 3 mix sticks shim between the cowl and back of the spinner backplate. Tape the aft edge of the cowl onto the fuselage, checking the bottom edge of the cowl is level [ reference the fuselage top / bottom join line if still visable, or the top of the footwells] and use the same ruler / spline to transfer the line on the fuselage forward onto the cowl..... simples !  

   Cheers,

   Nev.

 

 

   

 

 

   --

grahamsingleton(at)btinte
Guest

Posted: Tue Mar 08, 2011 4:36 pm Post subject: cowl cutting - bak edge

Graem

looks like Nev has your answer

Graham

From: graeme bird <graeme(at)gdbmk.co.uk>

To: europa-list(at)matronics.com

Sent: Tuesday, 8 March, 2011 21:23:00

Subject: Europa-List: Re: cowl cutting - bak edge

--> Europa-List message posted by: "graeme bird" <graeme(at)gdbmk.co.uk (graeme(at)gdbmk.co.uk)>

Graham, checking again I am  compliant with the 1" back from the front of the flange as it says in the manual, so it must be the spinner that doesnt come back enough.

--------

Graeme Bird

G-UMPY

Mono Classic/XS FWFD 912ULS/Warp drive FP

Build nearing completion

Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=333250avigator?Europa-List" ="http://forums.matronics.com" target="_blank">http://forums.matronics.                    &nbsptronics.com/contribution" target="_blank">http://www.matronics.com/contri================

 [quote][b]

neveyre(at)aol.co.uk
Guest

Posted: Wed Mar 09, 2011 12:43 am Post subject: cowl cutting - bak edge

Hi Graham,

   Had a thought, where did you get the spinner from ?

   The original XS spinner was as I described with about a 1'' flange aft of the prop hub face, for some reason Europa have supplied non original spinner assemblies plucked it seems, at random, from an outside supplier [ I think Dave Park had one of those which he sent back] sets the entire spinner too far forward.

   Luke 23, 34     Nev.

 

 

   

 

 

   --

dpark748(at)hotmail.co.uk
Guest

Posted: Wed Mar 09, 2011 2:41 am Post subject: cowl cutting - bak edge

Hi Graham, Nev,

 Yes, I bought a new Warp Drive from Europa and they sent a spinner as described by Nev.  I had to replace it with an original Europa spinner.

 Also bought the Airmaster and that comes with spinner backplate etc. looks like excellent quality. Test flying on Warp Drive.

 Dave P

  

 

   To: europa-list(at)matronics.com

Subject: Re: Re: cowl cutting - bak edge

From: neveyre(at)aol.co.uk

Date: Wed, 9 Mar 2011 03:27:44 -0500



 Hi Graham,

 Had a thought, where did you get the spinner from ?

 The original XS spinner was as I described with about a 1'' flange aft of the prop hub face, for some reason Europa have supplied non original spinner assemblies plucked it seems, at random, from an outside supplier [ I think Dave Park had one of those which he sent back] sets the entire spinner too far forward.

 Luke 23, 34     Nev.

 

 --

grahamsingleton(at)btinte
Guest

Posted: Wed Mar 09, 2011 3:39 am Post subject: cowl cutting - bak edge

Dave

sensible plan!

Graham

From: david park <dpark748(at)hotmail.co.uk>

To: europa-list(at)matronics.com

Sent: Wednesday, 9 March, 2011 10:37:00

Subject: RE: Europa-List: Re: cowl cutting - bak edge

    Hi Graham, Nev,

 Yes, I bought a new Warp Drive from Europa and they sent a spinner as described by Nev.  I had to replace it with an original Europa spinner.

 Also bought the Airmaster and that comes with spinner backplate etc. looks like excellent quality. Test flying on Warp Drive.

 Dave P

   To: europa-list(at)matronics.com

Subject: Re: Re: cowl cutting - bak edge

From: neveyre(at)aol.co.uk

Date: Wed, 9 Mar 2011 03:27:44 -0500

 Hi Graham,

 Had a thought, where did you get the spinner from ?

 The original XS spinner was as I described with about a 1'' flange aft of the prop hub face, for some reason Europa have supplied non original spinner assemblies plucked it seems, at random, from an outside supplier [ I think Dave Park had one of those which he sent back] sets the entire spinner too far forward.

 Luke 23, 34     Nev.

 --

Fergus Kyle

Joined: 03 Jun 2007
Posts: 291
Location: Burlington ON Canada

Posted: Wed Mar 09, 2011 8:08 am Post subject: Cowl cutting - bak edge

Lord, Graeme,  

        .....we are truly fortunate that Nev is watching and always has the answer!  Altough one needs to quote Graham, Bud and several others from time to time.  

Ferg    [quote][b]

graeme bird

Joined: 15 Jul 2010
Posts: 434

Posted: Wed Mar 09, 2011 11:47 am Post subject: Re: cowl cutting - bak edge

ah, well I brought the prop and spinner secondhand from a certain europa flyer in Corinth Texas, who had it on a 914 while waiting for his airmaster to be repaired

budyerly(at)msn.com
Guest

Posted: Wed Mar 09, 2011 8:13 pm Post subject: cowl cutting - bak edge

<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->  It is not uncommon to have 1/4 inch.  My Classic with the XS FWF had  the same problem and I added three layers of glass on the inside and flox to  fill level and one layer on the outside peel plied and let cure.  Fill  and sand.  I use poster board with release tape on it to make a  form on the outside, after laying the glass and use small clamps to hold  the paper exactly where I want it.  Sand and block to  make the line straight.  Remember, the two lines looked at most  are around the canopy and the cowl.

 Bud 

 [quote]   ---

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