Re: engine mount

Morris-

Makes sense to use a machine screw. I didn't want to put that muc trust in threads in wood alone! I can then place the plywood floo below the blind nuts and make them disappear. Agree?

I'll try the washer idea. But maybe after the first flights? I' using an Evolution .46 with their trainer kit. It is a three blade

But I should probably build the wings first...before that firs flight!

Thanks

-- EJ

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I don't know if I would try to hide the blind nuts. Cosmetically, it would be prettier but things like crashes happen and I like to salvage my hardware if I trash a model too badly. The Evolution .46 is a pretty powerful engine for the Stick 40. I flew mine (several of them) on the venerable O.S. 40FP, "the best .25 ever made". However, Sticks 40s tend to build a bit tail heavy and the Evolution's extra weight should help the CG. Most of mine required a "heavy hub" on the prop to balance. You might want to be a bit gentle on the throttle.

Morris

No, don't wait. Put the washers under the rear bolts before the first flight. No need to hide the blind nuts, that is just extra work and weight.

Drill thru, use socket head screws (allen), good sized washers and those nylon insert locknuts.

One more thing -- when you get it flying, periodically check the tightness of your engine mounting bolts. Of course, you should do this on all models, but wooden beam mounts like the Stick 40 uses do compress with age and the engine gets loose. I know -- after not doing this the plane didn't fly quite right. After landing, the engine was dangling by one bolt!

Morris

I would drill through and use machine screws with nylon locking nuts.

All-

Good ideas, thanks. I have not found 4-40 hardware yet locally. I' tempted to settle for 6-32. Do you suspect I will have adequat holding strength with 32s and star lock washers? Of course I'll watc them each flight...

The #4s seem pretty light duty for the job at hand. The mounting hole in the engine are just over 1/8". Even with a #6 there is som space... I did pick up some #6 blind nuts as well as flat and loc washers. Good advice, there!

-EJ

-- EJ

----------------------------------------------------------------------- EJK's Profile:

go with the 6-32. I never use anything smaller. Good insurance. On bigger engines I go to 8-32 or even 10-32 on the gassers.