Hi. The pipe gives you more power and we have not any problems with the throttle response
that some pipe setup has. You can get more power from those engines but as it is now it has been the quietest engine except from electrics at the competition (IMAC reading 83dB) and has been total reliable. With right cooling, oil etc.
As you can see my son Carl has used it in a lot of competitions. The EF 74” YAK is a good plane to put it in, its not the lightest plane, but its very strong, there is lighter planes in this size but in our case it must be strong enough to keep up with the abuse from very hard flying and the plane and engine has done this . Our plane weights 6.1kg with fuel, the pipe mod adds a little weight because the pipe is heavy but it climbs out from hover quite nicely OK it not ballistic. We haven’t really compared because we haven’t seen any other 26cc at the competitions only 50cc-160cc and they have been beaten in Sportsman and Freestyle. Maybe the pilot has something to do with it also.
But OK, you can put a 40-46cc engine in a 74” plane. The only thing I can think of is that the engine should be very cheep or that they are so low powered that it’s needed. But with the same setup that we have you get a nice combo with enough power and it’s very quiet. But it’s your choice.
Maybe some of the videos can give you the feel of performance.
and I found anotherone to.
Carl fooling around
http://www.junkshop.nu/flyg/Arvika20...demo_small.wmv
http://www.junkshop.nu/flyg/Arvika20...n_demo_big.wmv

//Lennart
SWEDEN
(Sorry about some spelling)