1:3 Scale Schweizer SGU 1-7 by Aerosente / Tom Martin design

[Len]

Tom or Mike !!!

ps:what would you guys think will be a good starting point for cg on a plane like this?

[stihac]

Tom or Mike !!!

I'm guessing 25-30% MAC ???

Petr

[yyz]

I'm guessing 25-30% MAC ???

Petr

Weren't there several of these flying at the aerotow event last weekend? Thought I saw a couple of photos. Even if they were 1/4 scale, you'd get a ballpark number as a percentage of the chord from the leading edge and use that number as a starting point.

There are members on the site that know how to do the formal calculation that will hopefully chime in.

[stihac]

There was 2-33 and TG2 /I think/ at Salem. I'm sure the CG for the 1-7 and 2-33 would be "close enough". I'll check what the 2-33 CG is.

Thanks Mike!

Petr

Edit: I'll double check my plans but I don't recall seing the CG. It wouldn't be the first time I missed something

[ARUP]

Novel idea with the spoilers! Keep up the great work!

[stihac]

Novel idea with the spoilers! Keep up the great work!

Thanks.

Petr

[stihac]

No luck getting tiny drill bit at the hardware store. Time to improvise.....
Will see what happens.
To be continued.....

Petr

[Len]

Petr,
Take a piece of wire or a pin the correct size and smash the tip to flatten it out, them use it like a drill. It works great

len

[stihac]

Petr,
Take a piece of wire or a pin the correct size and smash the tip to flatten it out, them use it like a drill. It works great

len

Cool idea! Thank you Len. I'll try it...next time.
See bellow what I did.

Petr

[stihac]

So here is the "spoiler kit"



Not knowing about Len's idea above I used the age old method.........

When in doubt use a bigger hammer



I used the same wire I used for the staples, sharpened the tip and hammered it trough the spoilers

Amazing what you can do with brute power



Here is the finished product. 90 degrees up travel, spring return action and positive lock when in closed position.



Next is just sand the spoilers to the contour of the ribs and ..... done with them.

Petr