26-08-2010, 10:23 PM
HK Digital Metal Gears are your go to servo for anything fast:
http://www.hobbyking.com/hobbyking/store...oduct=6314
I reckon a decent 70mm would be on the cards for any sort of performance. The HK fans ARE ok but can come unbalanced which could be a bit of a pain. I reckon source the motor from HK but grab a fan unit from Mark down at ExtremeRC.
A twin EDF setup would be extremely amp hungry and limit your flights even more but would be pretty cool. I'd say 64mm min, I can't see 55's have anywhere near the torque needed for the grass strip.
In the end, it all depends on how you want this thing to fly. A prop will yield best torque and top end speed without breaking the bank. EDF wins on cool factor.
The one thing you gotta keep in mind with Pushy cats is that you have a blown elevator for the majority of the flight. You then throttle off to land and have bugger all pitch control, a twin EDF setup that mitigates this by placing the thrust elsewhere would be very cool!
http://www.hobbyking.com/hobbyking/store...oduct=6314
I reckon a decent 70mm would be on the cards for any sort of performance. The HK fans ARE ok but can come unbalanced which could be a bit of a pain. I reckon source the motor from HK but grab a fan unit from Mark down at ExtremeRC.
A twin EDF setup would be extremely amp hungry and limit your flights even more but would be pretty cool. I'd say 64mm min, I can't see 55's have anywhere near the torque needed for the grass strip.
In the end, it all depends on how you want this thing to fly. A prop will yield best torque and top end speed without breaking the bank. EDF wins on cool factor.
The one thing you gotta keep in mind with Pushy cats is that you have a blown elevator for the majority of the flight. You then throttle off to land and have bugger all pitch control, a twin EDF setup that mitigates this by placing the thrust elsewhere would be very cool!