ORIGINAL: Nitro2Burn
Heaps of great info guys thanks. After checking through them all I believe I will be going with the 6060 at the root and 6061 at the tip. Finally Red do you use any wash out? or you find no real need for it so far? I've had a few people here tell me you NEED it but have never HAD to really use it before on kits or scratchies, however I have not built a machine based around speed before.
Tip stalls aren't usually an issue for me as I always do my best to test aircraft stall speeds at height on test flights so I get an idea of what kind of a suicide mission I'm flying before I go slow and low. Though there is always ''that time'' when you get caught wi th your pants down (caught by suprise) and you find out how well an aircraft cartwheels along the deck.
Nitro,
I'm not with the masses when it comes to the use of washout. I follow a different philosophy when it comes to wing design than many others do. As such your results may vary
I build mostly racers and high performance (faster) type aircraft, F3B(F) gliders, and the occasional 3D type thrown in. None of them have washout....ever. Twist or washout in a wing is induced drag, has an effect on top speed (every little bit helps when racing), and works in reverse if you are inverted. Granted you are not usually at landing speeds while inverted, but if you fly aerobatics you will be at some point. I really like a well behaved airplane all around.
I have found that by careful airfoil tailoring, you get the same effect as washout without the penalties assosicated with it. It typically like to use a thinner airfoil at the tip from the same family. This keeps the air attached at the tip at higher Alpha thus preventing tip stalls. A good example is my Tsunami above. The wing loading works out to be over 28 oz/ft and it lands great with no issues. On a typical warbird, like a P-51 for instance (I've built many Reno racers) I use the same airfoil progression and if you want some extra stability, reflex the ailerons about 1/8" during landing. I'm a big fan of spoilerons for landing instead of flaps too, but thats a whole post to istelf.
Cheers
Red