Aris HobbyKing SkyFun with a rocket motor at SCCMAS
Ari says:
HobbyKing SkyFun electric pusher jet turns out to be a very adaptable RCRG platform. This is my third build. With this build, I'm trying to move the motor closer to CG so as to avoid CG shift altogether during burn, or to have CG move backward during burn.
For the build thread :
I sliced a wedge out of the aircraft's rear and mounted a 24mm tube there. I reinforced sides of the cut with 1/32" plywood both to restore some of the mechanical rigidity and to protect foam from exhaust. I covered plywood with aluminum tape for additional thermal protection. This glider has ACME launch guides on its bottom surface. One drawback of AkyFun's profile is the difficulty of attaching rail buttons on top. Canopy is too floppy and in the way. I'm curios to see how bottom guides work.
All three motors I used today were identical: F30. They are considered
"longburn" motors, thrusting for 2.3 seconds (this is in contrast with
.8-1.2s regular motors and .3-.4 "fast" ones). F30 has 73 Newton-Seconds
of impulse (that's a multiplication N*s rather than division N/s).
Impulse is in this case a measure of energy a motor stores.
HobbyKing SkyFun electric pusher jet turns out to be a very adaptable RCRG platform. This is my third build. With this build, I'm trying to move the motor closer to CG so as to avoid CG shift altogether during burn, or to have CG move backward during burn.
For the build thread :
I sliced a wedge out of the aircraft's rear and mounted a 24mm tube there. I reinforced sides of the cut with 1/32" plywood both to restore some of the mechanical rigidity and to protect foam from exhaust. I covered plywood with aluminum tape for additional thermal protection. This glider has ACME launch guides on its bottom surface. One drawback of AkyFun's profile is the difficulty of attaching rail buttons on top. Canopy is too floppy and in the way. I'm curios to see how bottom guides work.
All three motors I used today were identical: F30. They are considered
"longburn" motors, thrusting for 2.3 seconds (this is in contrast with
.8-1.2s regular motors and .3-.4 "fast" ones). F30 has 73 Newton-Seconds
of impulse (that's a multiplication N*s rather than division N/s).
Impulse is in this case a measure of energy a motor stores.
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