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Mid Engine Design-Air Corba & Stilleto Babe_b10
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Mid Engine Design-Air Corba & Stilleto Empty Mid Engine Design-Air Corba & Stilleto

Post  RK Flyer on Sun Apr 13, 2014 8:53 pm

Mid Engine Design-Air Corba & Stilleto <a href=Mid Engine Design-Air Corba & Stilleto 005_rk10" />Mid Engine Design-Air Corba & Stilleto <a href=Mid Engine Design-Air Corba & Stilleto 004rk_11" />


A few of you have asked for more details on the Mid Engine design that I used on the P-39 Air Corba, so here goes.
Since I retired a few years ago I wanted to find somethig to do besides fishing. I wanted to get into Cox model planes like I flew back in the 1950's as a kid. Back in Nov. I was looking at plans on E Bay & found the "Stilleto" and just had to build it. I had just started when the Speed Contest started so I switched over to The P-39 and built a profile design to enter. The P-39 was used in WWII in the Pacific but also used by other countries , mostly Russia. The P-39 & the later version the "King Corba" were both used in the Reno Air Races and the "Thompson Trophy Race in 1946 was won by Alvin "Tex" in a Air Cobra. The Thompson Race was a 30 mile course for 10 laps a total of 300 miles.
I also found a lot of info on the Reno Air Races at : AAFO Hangartalk--P-39 Racer. U tube has a lot more of course , just type in P-39 Air Cobra & Reno Air Races.

The Stilleto can be found on E Bay under Model Airplan plans in RC & Control line at: the Vergina 123 Store under "Model airplane vintage proto speed plane y2a. The plans come on a disk and are very complete, with a lot of engine details.

The pictures above show the drive train I used in the Corba with a 1/4" I D brass tube holding 2 slip bearings and a #5 steel rod threaded with a 5-40 die. This is not the design used in the Stellito which is the larger #8 steel shaft with the u joint & in the alu. tube. As soon as time permits I will go back to the Stilleto so more on it later.

The picture shows the the drive shaft & engine in the test stand that I used, unfortunately I dont have a way to measure the RPM's to find out how much I am losing. The compents are shown with the upper flange bering out of the tube. Its a pretty simple method once you get the parts.

Hope this helps, RK Flyer
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Post  ian1954 on Mon Apr 14, 2014 11:51 am

I am interested in this but I am having trouble seeing the "thumbnail" pictures. Any chance of getting bigger pictures?

I like to see the unusual and a mid engined model aeroplane is unusual. It reminds me of IC engined boats with a propeller shaft.

Do you have any problems starting it with the lengthened shaft? A boat IC usually has a flywheel and the engine started using the flywheel (string wrapped around it!)
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Post  ian1954 on Tue Apr 15, 2014 7:49 am

Thanks Richard

Here are your pictures. I can see them now.

Mid Engine Design-Air Corba & Stilleto 00410

Mid Engine Design-Air Corba & Stilleto 00510
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Post  roddie on Tue Apr 15, 2014 11:56 am

"Dumas" may still make a Marine drive hardware kit (#2306) designed for Cox .049 engine use in their small boat kits. The kit includes a steel drive-shaft that I believe is 5-40 threaded at both ends.. as is the stub-shaft for mounting the universal-joint/flywheel to the engine. This marine set-up did not require bearings.. but you could easily utilize RC car bearings if you wanted to.

Mid Engine Design-Air Corba & Stilleto Dumas_16
Mid Engine Design-Air Corba & Stilleto Dumas_17
Mid Engine Design-Air Corba & Stilleto Duratr12
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Post  RK Flyer on Tue Apr 15, 2014 12:14 pm

Ian, Thanks for posting the larger pictures!

Roddie, I think the Dumas parts look interesting but the Dura Trax ball berings might be the best way to go.

I will try to finish the Stiletto that I started in the next couple of months. Are you going to build it?

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Post  roddie on Wed Apr 16, 2014 1:18 pm

RK Flyer wrote:Ian, Thanks for posting the larger pictures!

Roddie, I think the Dumas parts look interesting but the Dura Trax ball berings might be the best way to go.

I will try to finish the Stiletto that I started in the next couple of months. Are you going to build it?

RK Flyer

Hey Richard, Not sure what I'm going to build next. Probably something easier..  Laughing The Rare Bear took a LOT of my time. I want to finish a Ringmaster that I have... so I can get some experience with a larger stunt model. I also want to build at least one more 1/2A C/L profile from one of the plans you sent me. Thanks again for those!!!
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Post  RK Flyer on Wed Apr 16, 2014 1:57 pm

Roddie,

The Rare Bear is a great looking plane and it really does reflect the time & effort that you put into it!


I have another 1/2 A set of plans for an unusual Trainer comming ! This one is a S-l-o-w flyer!

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