battery placement and layoutAnother thought and factor: battery placement and layout.
Some airframes have 2 6s packs lateral-parallel layout
; more of a block of mass. That layout puts its placement further ahead of the CG, thus distributing more mass towards the nose.
Examples: Gaui 700 and XXtreme 700/800.
Similarly, some heli's have vertical-parallel stack layout
with the 2 6s packs, one underneath the other; the same mass distribution on the x axis and z axis as the lateral-parallel layout.
Examples: Raptor G4, JR something.More curious:
Other airframes have the 2 6s packs in series layout
. Now this layout is more interesting to me because more mass is under
CG (a good thing?)
, and less mass ahead of CG.
Examples: Trex 700e, many others.
So, that all said, my thoughts are the parallel layouts described above should have a worse advantage with pirouette whipping, etc. BUT, to its credit, it sure seems not to have a problem (both Gaui and Xxtreme) when I see very aggressive high-speed flight with left-rudder input. (I tend to have a nack for noticing these characteristics.)Experience:
I've also flown a Gaui 700 and performed EXACTLY as I would expect: no whipping and just felt super locked with consistent pirouette with my typical routine flight, and with all that I could throw at it. So impressive, and made me start thinking of all the factors.My correlation
is compared to a nitro 700 size heli. I realize the overall weight is ~1.5 pounds lighter (680 grams), but [I would think] the mass distribution is also a factor too. My former 700n had a lower tail ratio rpm and was flawless in tail consistency (with Spartan tail gyro and JR tail servo, 5v)
. I had total confidence in the tail, and it would not could not
whip or blow out even in very windy conditions, sea level, and excessive collective and cyclic. It was quite a feeling, and no exaggeration; I tested it in this way so I could rave as I do.-->
So then, given the same tail box and hardware setup and gyro:
1) Is it a matter of a heavier heli?
2) Is it a matter of different mass distribution?
3) Is it a matter of more power/torque surging to the rotors?
4) Is it a matter of tail ratios?
5) "Chinese" counter weights on the grips? (truly balanced to counter the wind force)
I'm thinking its more of #2. I wish I could thorough study the physics, laws, and formulas, and just test this with a controlled experiment. I really wonder if any of these points have been carefully considered when 3D heli designers create their airframes. (I hate to admit the reality that some tail gyros are truly better.)
Thanks for reading. I would love to hear your detailed in-depth responses on such an interesting topic!
I don't hear anyone else really digging into this. Thanks.
Team MSH USA * Protos Max * Xpert servos * Cyclone Blades * ProgressiveRC * VoltMagic * Ecalc