Techniques > Misc

Problems to think about

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Happy Days:
Talking of Spoilers,……what angle are they normally deployed to? :?:

I’m assuming something like a max of  45degrees to the wing surface.

K.

billscottni:
for the wing top barn door style of spoiler 90 if you can get it. You'll have proportionality to vary that if you're using the throttle stick.
You will need some elevator compensation when they're deployed, so first attempts should be at height to see what's needed

Happy Days:
These spoilers are only hinged with tape on the top. If I deploy to 90 degrees the spoilers tend to pull away from the tape. (Become unstuck) So 90 degrees might be pushing it a bit. They don’t seem to mind rising 60 degrees though.

Thanks for that info Bill. Might get her out this weekend if the winds calm down a bit. Still covering it at the moment. Anyway, when I maiden her I’ll be ready with the elevator!

Thanks again,  
Keith

Happy Days:



Well here she is, finally coming in at an AUW of 42.5ozs when weighted nose heavy for maiden flight. If I remove the extra weight in the noose to bring the CoG to it’s rear most point, (which I tend to prefer) then the total weight comes down to 41ozs.

Overall a rather disappointing figure given my original target of 40ozs. :(  I do wonder if the manufactures figure of 44ozs with their supplied components is actually possible. I replaced the supplied nylon push rods with pull-pull cables, the steel/brass wing joiner with carbon rod/tube, (that alone saved 2ozs) the majority of the covering is done with Fimba film and I drilled a large hole in the nose block so as to fit the counter weights as far forward as possible, thereby using less lead to balance the plane.

I’d say that was a lot of extra work for very little benefit,….but you live and learn. :!:

While I’m in a moaning frame of mind, I’m rather disappointed with the spoilers as well. I’ve attached them as described in the instructions by simply hinging them with tape from the top of the main spar. They’re operated by way of a thin cord linked to a single servo in the fuse. The problem being that if the spoilers are deployed to full 90 degree, they tend to pull away from the tape and become unstuck from the hinging tape. I don’t think they are going to be very effective. Further mods’ will have to be considered eventually. I’m thinking I probably wont need them when flying off the ridge though, we’ll see.

Just waiting for the right conditions to try her out now. (Never thought I'd find myself praying for gentle breezes :roll:

K.

billscottni:
Fold them fully forward Keith, so they're lying on the wing and run a second piece of tape on the inside of the hinge Keith, just as you would with an aileron or rudder. This will help stop it pulling away

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