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Battery compartment
It's cramped in there.
Pat |
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A 30mm difference in CG is extremely ODD. Did you measure your CG at the LE of wing along a fuse pod(with engine) or along cockpit pod? |
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This is mockup showing the engines with 3 blade props. These are 9x7x3 MAS and there is plenty of room. Landing gear obviously will be needed as these dont flex. I doing that dark nightfighter/recon scheme similar to the full size plane pictured previously in the thread
(located here : https://www.rcgroups.com/forums/atta...hmentid=979277 ) The cowls need to be painted to match of course, but the green is there for a primer on the plastic and some on the wings for weathering. Lots more to do, but thought I'd share progress. |
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with the differecces of Batteries,servos and motors the planes balance where they balance. And the both fly. I will admit the CG,s are a spread. |
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Ken |
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I had to put 20 grams of lead in the rear of the booms under the tailplane to balance at 93 mm from the LE, measured on the side of the pod. I am working on a lightweight pointed spinner cone to allow some of this lead to be removed. This should allow a 19 gram reduction in weight. 14 grams less for the spinners and 5 grams of lead removed fron the tail. Ken |
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Last edited by kensp; Oct 16, 2006 at 05:32 AM.
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Just to get this right in my head, even though the gws manual says 60mm back from where the middle (fuse) pod meets the wing (as shown on page 16 of manual), this is where the cog is, Kensp says it's around 93mm back from the same point. Thats a big change for sure. As I am getting ready to balance mine soon, I just want to make sure I'm reading this correctly, because between Ken, Rudedog and GWS, there's some big differences here!
jag |
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Thanks for the battery compartment pics. Is anyone installing a Thunder Power 2100 mAh 3s (or a Tanic 2220 mAh 3s) LiPo in that tight space?
With respect to the CG issue -- in the REAL P-38, the pilot actually sits right on the CG. I've balanced three of my other P-38s this same way... Just look at the canopy, where the "X" is -- that should get you very close. That being said, I know GWS is in the habit of making aircraft that are not exactly "scale" (GWS says they do this because their airplane designs fly better) -- as a result, the CG could possibly be different than the other P-38's I've built and flown... |
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Last edited by Red 61; Oct 16, 2006 at 07:12 AM.
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Watch out for Low-Voltage Cutoff on ONE electronic speed control on those low-altitude, high speed passes! |
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One more post this morning, and I promise I'll stop (for the morning anyway).
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I switched to GWS props, but they're too flexable (easy landings, but not enough thrust or speed). I finally ended up with APC-E props as a great "middle of the road" (just stiff enough, but not too stiff) solution. |
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