mrbcruzn

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Not sure my spell checker is working today? I'm buiding a scat cat for a 424 entry Q500 race, and have just sheeted the foam wings, my plans are old. But I cannot find what the dihederal setting is for the wings. I was thinking a 1/4 or 1/2" under one wing while I epoxy them together. Plans say set by degrees but it doesn't say. Can anyone help?

Thanks in advance....

BUDMAN27

What would be wrong with not putting any at all ? That is what I would do.

mrbcruzn

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I would normally do that if the wing was on the top, but I haven't seen a low winged plane in a long time without some dihederal in it?

keyman

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for anyone looking for plans-lonestar has them for $5 & $2 shipping-at least that's what I was told on the phone

Alabama Racer

I flew them for years without any dihedral. The main difference that I could tell is that they look
a little funny when coming in on final approach - just a visual thing of getting used to seeing
them w/o dihedral. If you race them, they might stay up on their side just a little better
w/ dihedral but the difference is slight.
Brad

burgster

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I don't have any plans, but I have a few old scat cats kicking around and they measured closer to an inch. Hope this helps.

Jeff

Electriceddie

Hey guys,

I just measured the diehedral for you. On my Scat Cat it is 1/2" diehedral.

Hope this helps.

Good Luck

Ed

DMUCOP

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I called my old man he made a few cats in his day. He told me that it started at 1.5" at the tip. He made lots of them at 1". Now he won't use any...Hope this helps.

mrbcruzn

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Thanks guys.....

stand-RCU

Dihedral causes drag where the wing meets the fuselage. If the angle is less than 90 deg., say 88 deg. the drag will be increased. Anhedral on a low wing would have less drag. That's why V-tails are at 110 degs. Less drag where the three angles meet the fuse; i.e., 125, 110 and 125 degrees. Less drag than a T-tail with four 90 deg. junctions.

On a high wing the 90 deg. junction to the fuse is on the under side of the wing and is in the low pressure area, where as in a low wing the junction is in high pressure area; yep more drag.

So your better off from an engineering point of view with no dihedral for faster airframe.