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Oct 15, 2006, 11:27 PM
Foam abuser!
crxmanpat's Avatar

Battery compartment


It's cramped in there.

Pat
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Oct 15, 2006, 11:44 PM
Registered User
kahloq's Avatar
Quote:
Originally Posted by rudedog
also remember I put a servo in the left inside boom intake for my elevator....may have something to do with it
Placement of any gear has nothing to do with what the proper CG is for controlable flight. If you have servo in a fuse radioator location, then simply you probably had to add a little nose weight to counter(or didnt need to based on other electronics positions).
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?
Oct 16, 2006, 03:48 AM
CAN WE MAKE IT FLY?????
rudedog's Avatar
the cockpit pod...
Oct 16, 2006, 04:26 AM
Registered User
kahloq's Avatar
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.
Oct 16, 2006, 05:12 AM
Never Trade Luck for Skill
MERLIN V16's Avatar
Quote:
Originally Posted by kahloq
Placement of any gear has nothing to do with what the proper CG is for controlable flight. If you have servo in a fuse radioator location, then simply you probably had to add a little nose weight to counter(or didnt need to based on other electronics positions).
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?
Is it not true that you can balance a plane anywhere by adding weight to the nose or tail (weather it be radio equip or clay)! Kensp has some repair weight on the rear of the tail boom I believe. Rudedog has a servo out in the tail boom.
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.
Oct 16, 2006, 05:17 AM
Registered User
kensp's Avatar
Quote:
Originally Posted by Red 61
Can someone please post a picture of the battery compartment?

Thank you!
Here they are.

Ken
Oct 16, 2006, 05:26 AM
Registered User
kensp's Avatar
Quote:
Originally Posted by MERLIN V16
Is it not true that you can balance a plane anywhere by adding weight to the nose or tail (weather it be radio equip or clay)! Kensp has some repair weight on the rear of the tail boom I believe. Rudedog has a servo out in the tail boom.
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.
Merlin.

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
Last edited by kensp; Oct 16, 2006 at 05:32 AM.
Oct 16, 2006, 06:34 AM
I fly for Beer
Jagzilla's Avatar
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
Oct 16, 2006, 06:43 AM
Registered User
GWS picture is wrong @60mm

Flying mine at 80mm and it needs to go back at least 5mm possibly more
Oct 16, 2006, 07:06 AM
Outcast outlaw
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...
Last edited by Red 61; Oct 16, 2006 at 07:12 AM.
Oct 16, 2006, 07:10 AM
I fly for Beer
Jagzilla's Avatar
The way mines turning out, I'll be using a 2100 3 cell in mine. It looks cramped in there, but it will fit. My 1500's I was planning on using just don't seem to be providing enough ooomph to run my twin Himaxx's.
Jag
Oct 16, 2006, 07:15 AM
Outcast outlaw
Quote:
Originally Posted by Jagzilla
The way mines turning out, I'll be using a 2100 3 cell in mine. It looks cramped in there, but it will fit. My 1500's I was planning on using just don't seem to be providing enough ooomph to run my twin Himaxx's.
Jag
Yeah, amp draw is a problem on a high-powered electric twin... Even my Tanic 2220 mAh 3s LiPos have trouble keeping up sometimes!

Watch out for Low-Voltage Cutoff on ONE electronic speed control on those low-altitude, high speed passes!
Oct 16, 2006, 07:19 AM
Outcast outlaw
One more post this morning, and I promise I'll stop (for the morning anyway).
Quote:
Originally Posted by kahloq
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 put these same props on my Air Devil P-38... They look cool, and provide lots of great thrust and speed. However, you are right in that they do not flex! EVERY belly landing ripped one motor mount out of the boom!

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.
Oct 16, 2006, 09:27 AM
Ship first, Improve often
L0stS0ul's Avatar
I'll be using a MegaPower 2200mAh 11.1v lipo in my plane. It's a bit larger than a TP 2100. It fits nicely in the area they have for the battery. I might have to modify it a little like Kensp did but nothing drastic.
Oct 16, 2006, 09:53 AM
Seeing the Farside.
Blaze.45's Avatar
GWS needs to start making some 3-blade HD props.

3-blade 9x5 HD

3-blade 9x7 HD

3-blade 8x6 HD

3-blade 8x4 HD

3-blade 7x6 HD

Are my votes.

-Chris


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