I just watched the assembly video. The staff made it clear the props are to rotate outwards. Mine rotate inwards. Came that way from factory. Getting to the Esc and the motor wires could be quite the travail.
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Found an easy access to motor power wires. All good -
Most twins with opposite rotation props rotate inwards at the top, unless there is a good performance or aerodynamic reason to do it differently.
BUT the P-38 rotates outward at the top, not inward. They tested inwards rotation, but it created undesirable turbuluence on the tail section.
After a change to outward rotation, the problem went away.
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Some will disagree, however this is my opinion.
The benefit to outward rotation on electric twins is inherent down-thrust created and proportional to thrust due to the inward vortexes pushing up on the horizontals (instead of down).
The reason "engines" tend to use inward rotation is for an unexpected "one engine out" scenario. ...Torque "semi-" cancels out yaw. It only mildly helps the problem as the pilot still must maintain directional yaw with only one engine. The real problem with this setup is encountered at low speed with two engines running and a hard push on throttles. The pressure from inward vortexes and subsequent downforce on the horizontals can create a stalled condition.
Most of our electric models benefit from outward rotation as they really don't have that "one out" issue. How often do you see an electric motor fail in flight?... especially just one? I use outward rotation on every single one of my twins. Very noticeable in a straight up climb as the aircraft no longer wants to pull onto its back. Aircraft tracks level with applied power in high speed pass. Try it!Fly low, fly fast, turn leftComment
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As a matter of interest, since I haven't owned the P38, does it run one battery/one motor like the F7F does? The biggest worry I had was that if one battery dies and I've got one motor out or at least one not running as effectively.
I remember we were talking about that at Nefi several years ago and I ended up running a couple of adaptors so that the batteries worked together to create a 'big gas tank' that both ESC's ran off. I actually tried taxiing the F7F with one battery running one motor. Lets just say I'm glad I was on the ground and not in the air!
Grossman56
(Dangerous Dan)Team Gross!Comment
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