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Twinstar MK II Items to examine

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Jerry-TS-MkII

Joined: 23 Aug 2017
Posts: 79
Location: Indiana

Posted: Sat Aug 26, 2017 4:04 am Post subject: Twinstar MK II Items to examine

Hello to all,

I just purchased a Mk II, and thought I would ask a few general questions.  It has a 503 DCDI, B box, and 64" Ivo 3 blade prop.  Flying it solo, can anyone share Vx for Best climb angle?  And what cruise I might expect?



One flyer mentioned a benefit of a 2 blade 68" Ivo, to lighten the loads on the B box.  Any other input or other prop suggestions?



I fully plan to completely examine the plane before it's put back in service, but asking here about any specific known problems that might need extra attention?  I have read over many of the posts.



I'll be adding bracing on either side of the tail wheel, and examining the fuse tube connection, and checking brace wire and control wire tensions, and the aileron bellcrank support AD.  I read about some leading edge tubes with fractures and may have to scope the tubes and main spar.  In general it looks good, but not knowing this plane, I'm asking about any other problem areas that others have encountered.  Many thanks for any replies.  Jerry

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brubakermal(at)yahoo.com
Guest

Posted: Sat Aug 26, 2017 4:13 am Post subject: Twinstar MK II Items to examine

we have a nice mk 2 listed on barnstormers here in Michigan, check it out!  

Malcolm & Jeanne Brubaker 

Michigan Sport Pilot Repair 

http://michigansportpilotrepair.com

LSRM-A, PPC, WS

Great Sails - Sailmaker 

for Ultralight & Light Sport

(989)513-3022

 

 

 

 





       From: Jerry-TS-MkII <12flybellaire(at)gmail.com>

 To: kolb-list(at)matronics.com 

 Sent: Saturday, August 26, 2017 8:09 AM

 Subject: Twinstar MK II Items to examine

  

 

--> Kolb-List message posted by: "Jerry-TS-MkII" <12flybellaire(at)gmail.com (12flybellaire(at)gmail.com)>



Hello to all,



I just purchased a Mk II, and thought I would ask a few general questions.  It has a 503 DCDI, B box, and 64" Ivo 3 blade prop.  Flying it solo, can anyone share Vx for Best climb angle?  And what cruise I might expect?



One flyer mentioned a benefit of a 2 blade 68" Ivo, to lighten the loads on the B box.  Any other input or other prop suggestions?



I fully plan to completely examine the plane before it's put back in service, but asking here about any specific known problems that might need extra attention?  I have read over many of the posts.



I'll be adding bracing on either side of the tail wheel, and examining the fuse tube connection, and checking brace wire and control wire tensions, and the aileron bellcrank support AD.  I read about some leading edge tubes with fractures and may have to scope the tubes and main spar.  In general it looks good, but not knowing this plane, I'm asking about any other problem areas that others have encountered.  Many thanks for any replies.  Jerry



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gdhelton(at)gmail.com
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Posted: Sat Aug 26, 2017 12:50 pm Post subject: Twinstar MK II Items to examine

I ran a 503 single carb on mine. It liked 50 to 52 mph on climb out as I recall? It's been a lot of years ago. I built Twinstar, TS 205.  It came with a wood 68" Tennessee Propeller. Which worked great. I later went to 64" three blade Ivoprop. It worked fine and was very smooth. I do think it climbed better with the two blade thou. I don't think there was a lot of difference in the gearbox loading. I changed my gearbox oil every 50 hours and never noticed any excessive wear. I flew the Twinstar for about four years. It was a good unit. A bit sluggish, but it is a two seater after all.



George H.

Firestar, FS100, 1986

14GDH

Mesick, Michigan 

gdhelton(at)gmail.com



Have a great day!



 	  Quote: 	
		   On Aug 26, 2017, at 8:04 AM, Jerry-TS-MkII <12flybellaire(at)gmail.com> wrote:

 

 

 

 Hello to all,

 I just purchased a Mk II, and thought I would ask a few general questions.  It has a 503 DCDI, B box, and 64" Ivo 3 blade prop.  Flying it solo, can anyone share Vx for Best climb angle?  And what cruise I might expect?

 

 One flyer mentioned a benefit of a 2 blade 68" Ivo, to lighten the loads on the B box.  Any other input or other prop suggestions?

 

 I fully plan to completely examine the plane before it's put back in service, but asking here about any specific known problems that might need extra attention?  I have read over many of the posts.

 

 I'll be adding bracing on either side of the tail wheel, and examining the fuse tube connection, and checking brace wire and control wire tensions, and the aileron bellcrank support AD.  I read about some leading edge tubes with fractures and may have to scope the tubes and main spar.  In general it looks good, but not knowing this plane, I'm asking about any other problem areas that others have encountered.  Many thanks for any replies.  Jerry

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=472210#472210

 

 

 

 

 

 

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Jerry-TS-MkII

Joined: 23 Aug 2017
Posts: 79
Location: Indiana

Posted: Sat Aug 26, 2017 1:27 pm Post subject: Re: Twinstar MK II Items to examine

Thanks George!

When I had asked about the 3 blade.. the other flyer felt that the 2-blade 68" was more efficient on a 503.  I'm more interested in a climb prop, and that usually follows a lower pitch and larger diameter.  His experience was regarding the physical loading of the bearings and components in a B box.. ie spinning less mass, which means less stress in general to accelerate the prop, etc.  He rebuilds a lot of Rotax engines (mainly for trikes), so he sees more than a typical airplane owner might.  My biggest concern was in thinking the 3 blade pusher, right behind the wing might be smoother than 2.  But it sounds as thou your Tennessee worked just fine.  I may look for 68" Ivo blades once the dust settles.  Always good to hear multiple comments that all point towards the same (positive) results.  And it would be slightly lighter too.  Again, Thanks!  jr

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gdhelton(at)gmail.com
Guest

Posted: Sat Aug 26, 2017 2:25 pm Post subject: Twinstar MK II Items to examine

I think you'll kind that a Twinstar climbs like a homesick angel when solo. Mine did. I like Ivoprops. I flew off a lot of decomposed granite and sand surfaces in Southern California and with the stainless steel leading edges it was pretty much indestructible. I do think my two blade was a better climb prop. 

I fly off of primarily grass fields these days. So the risk of prop damage is not as great. I should receive my new Tennessee 66X28 prop with composite edges this week. Under $600.00 delivered. My 30 year old Culver wood just doesn't seem to doing the job anymore? I'm  not sure what has changed but I'm turned 7100 rpm on takeoff which is to high. I thought it was my tachometer. But, my new one agrees with the old one. Later, George 



Have a great day!



 	  Quote: 	
		   On Aug 26, 2017, at 5:27 PM, Jerry-TS-MkII <12flybellaire(at)gmail.com> wrote:

 

 

 

 Thanks George!

 When I had asked about the 3 blade.. the other flyer felt that the 2-blade 68" was more efficient on a 503.  I'm more interested in a climb prop, and that usually follows a lower pitch and larger diameter.  His experience was regarding the physical loading of the bearings and components in a B box.. ie spinning less mass, which means less stress in general to accelerate the prop, etc.  He rebuilds a lot of Rotax engines (mainly for trikes), so he sees more than a typical airplane owner might.  My biggest concern was in thinking the 3 blade pusher, right behind the wing might be smoother than 2.  But it sounds as thou your Tennessee worked just fine.  I may look for 68" Ivo blades once the dust settles.  Always good to hear multiple comments that all point towards the same (positive) results.  And it would be slightly lighter too.  Again, Thanks!  jr

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=472223#472223

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Richard Pike

Joined: 09 Jan 2006
Posts: 1671
Location: Blountville, Tennessee

Posted: Sun Aug 27, 2017 3:52 am Post subject: Re: Twinstar MK II Items to examine

My experience was that the 2 blade climbs better. Also, using Mobil 1 gearbox lube not only keeps the gearbox cooler, when changing the oil during the annual, it comes out looking pretty much the way it looked when it went in with minimal mung on the magnet.

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Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0

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