Uravitch A-7
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Uravitch A-7
Hello all, I'm fairly new into scratch building and have made a few planes but this one has me miffed. I built the Uriavitch A-7 according to plans...didnt modify anything. Came out at 4.25 lbs. Looked great. Would not fly...tried to hop off the ground early on the first takeoff...so the next one i held it down and after a considerable ground roll i finally let it rotate slowly and it just snapped over on its back. Someone told me that the high wing loading doesnt fair well at the high altitudes, but that doesnt makes sense with regard to stall. Anyway, wondered if anyone else had had problems with this particular design at high altitude or if anyone had any advice because i'd love to build another...thanks
chris
chris
#4
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RE: Uravitch A-7
About the time the model was published in MAN I had made a slightly smaller A-7 to use as a sloper. Span is 36". Weight 22 oz. The Uravitch plane wasn't that much larger, if memory serves. House of Balsa kitted it, but that seems to have been a shortlived enterprise.
If the plane is as small as I recall, anything over 3 pounds is way too heavy!
If the plane is as small as I recall, anything over 3 pounds is way too heavy!
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RE: Uravitch A-7
It is a pretty fast building scratchbuild..took me two weeks maybe. It gets a little tight in some areas due to its size while building so plan ahead. I used a J-tech muffler and had the engine completely concealed for the most part. Looked very scale. I too wanted to blow it up to a larger size. But like i described it has a fairly high wing loading so i wouldnt get carried away with retracts and all that stuff. I would also do the ailerons/servo combination different than the plans as well. With regard to the wing loading, save as much weight as possible in the nose...the more you put up there the more your gonna have to use in the tail to counter it. I had to use a ton in the aft section to counter that little .25LA. which of course jacked the wing loading right up. I hate to say it but a good idea might be to actually move the wing forward a littlle..maybe a half inch. that would help allot with the forward c.g. problem and save you weight in the end and it would still look great...or even stretch out the fuse a little..that would even make it look more scale...its actually a little stuby..i wish i had pics of it..my buddy has some of it I'll enclose them for you guys shortly. o.k. this was long winded..sorry. take care.
chris
chris