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  • June 25, 2019, 06:54:35 PM

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Author Topic: 21 Profile Proto Build  (Read 542 times)

Offline Motorman

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21 Profile Proto Build
« on: December 23, 2018, 12:05:06 PM »
Ah look what I found in the old engine drawer. This is a first run C21 Rossi and the P/L has been on Timmy Gillots milling machine. The rest of the mods to head and crank timing are my own repair. This is the engine I used a few times in AMA slow rat and, before the guys got the right set up with their 25's, I managed to win a few contests. I think it's a strong engine so I want to build a nice plane for it. Don't know where I'm gonna fly it or who would help me with it but it sounds like a fun project.

Motorman 8) 

There will be a sunny day and we will fly our airplanes.

Offline C.T. Schaefer

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Re: 21 Profile Proto Build
« Reply #1 on: December 24, 2018, 04:39:00 AM »
Walt, You are always welcome to come and fly it at the MM field.  Lots of speed junkies here!  No pylon but great for testing.  TS

Offline Motorman

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Re: 21 Profile Proto Build
« Reply #2 on: January 08, 2019, 09:07:39 AM »
Still in the design phase, got my little 1/2a proto for inspiration.

Motorman 8)
There will be a sunny day and we will fly our airplanes.

Offline Motorman

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Re: 21 Profile Proto Build
« Reply #3 on: January 11, 2019, 07:58:15 PM »
Progress has been made. I'm always trying to come up with new ways to marry the greasy vibrating metal thing to the balsa wood so here's my latest creation. This 7075-T651 aluminum crutch thing will extend back into the structure and also be sandwiched between CF plates and have a few well placed screws. It's probably a little over built but I didn't want to chance it breaking across the rear motor mount screws. The main bearers are .400 thick and .325 wide and I planned on 5-40 mounting bolts. Dang thing weights 2oz. but it's solid as a rock and that counts allot on a high revving engine.

Motorman 8)
There will be a sunny day and we will fly our airplanes.


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