HobbyKing B-17 EPO 1875mm Memphis Belle. - Page 13 - RC Groups
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Jul 23, 2011, 02:30 AM
"Because I was pǝʇɹǝʌuı"
bighead93's Avatar
Originally Posted by Paradude
Finally flew mine today and must say I am not impressed, perfect trim etc as the plane is well built but it lacks any form of power. I was at WOT most of the time so will try packs further forward as jrb has done.......I was just on nose heavy at 15.5 inches
What lipos were you using?
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Jul 23, 2011, 04:29 AM
Registered User
First flight was 2 x 3S 2200 25c packs and the second was with 2 x 3S 2200 30c packs. Packs were warm after 1-2mins so I'm guessing its using everything its got. Im not the most seasoned flyer so my experience is minimal but from what I have learned with other RTF planes is they almost always perform better with a little more mojo so I will go 4 cell
Jul 23, 2011, 08:20 AM
6 months to finish a rtf
pulsery2k1's Avatar

the power problem is most likly in scale props , I have the mossie
from the same company and just by changing the props to
master Airscrew 9x7x3 make's fly like a totaly diffrent model.
until mine arrives I can't tell for sure but the props do look the same.
Jul 23, 2011, 10:10 AM
In NY's beautifull hills
staggerwing's Avatar
Originally Posted by pulsery2k1

the power problem is most likly in scale props , I have the mossie
from the same company and just by changing the props to
master Airscrew 9x7x3 make's fly like a totaly diffrent model.
until mine arrives I can't tell for sure but the props do look the same.
I did read somewhere that some of the three blade imported props on multi engine foamys flatten @ as RPM increases & should be replaced w/ better quality but don't remember if it was relative to this B17 . Regardless , it is a relatively inexpensive improvement W/ more feedback validating this need.

OK,this is where I saw it---in jrb's thread
, 2011, 06:32 PM Report This Post to a Moderator #9
Registered User
Join Date: Oct 2010
Location: LE MANS, France
Posts: 125 Hi,
I have make a "static" building of this B-17 (from Lanxiang who's the manufacturer).
1st: you most creat a carbon or wood renfort to have very strong wing (not include)
2nd: install 2 pieces of wood gudgeons for fixing wing in the fuselage (plastic one are too shorts).
3rd: propellers are pour quality and will flatten with power of the motor. So try to find better quality of propeller, contra rotatives
4th: CG seems good, but the place for 2 3S lipo is too advance on the front, so you must put them under roof tower. That means 2 possibilitie for acces: By the cockpit, but not easy, or cut the roof for easy acces and glu some magnets.
But this las point must be check...I'm 90% sure of the bad stock position of lipos...
Last edited by staggerwing; Jul 23, 2011 at 06:13 PM.
Jul 23, 2011, 10:17 AM
Vintauri's Avatar
What is the approximate size of the stock props? I'll look and see if it's listed somewhere but if someone who has there kit can tell us it would be great.

Jul 23, 2011, 10:32 AM
Registered User
A prop change sounds like a good plan, stock ones are 10inch x ?? very shallow....4 at the most (they are slow fly double nut type so Masterscrew etc would need prop mounts). They are also narrow AND flexible so I can see why they flatten out, I have been watching jrb's vids etc and wonder if thats the reason he seems to be chasing COG. Need to get spare props anyway.
Jul 23, 2011, 10:41 AM
6 months to finish a rtf
pulsery2k1's Avatar

after a long delay mine will be here on friday - I have both
master air screw 9x7x3 and 10x 7x3 props so I can try both
and see what amp/watt reading I get compaired to stock

going to 4 s is a good choice but be careful at 4 s unless
this has a seprate ubs you cause the bec's to overamp/overheat
so a amp/watt meter is needed to check
Jul 23, 2011, 10:49 AM
Vintauri's Avatar
Maybe the new style GWS 3 blade props would be an improvement then. I'll have to look at the ones I have to see what they look like.
Jul 23, 2011, 10:59 AM
Registered User
stacker's Avatar
Has anybody taken a watt and amp reading yet?

The six pound B-24 I scratch built had plenty of power at only about 125 watts per motor. It can fly super slow, or climb at a steep angle. Flights can last 20 min. on two 2150 3s packs. Here is a video from two years ago with CN at the sticks. Props used were four Parkzone Corsair props which might be too large for the B-17, also prob. too steep of pitch without re-winding the motors. J. Morgan also built one of the B-24's and used the same props with 750kv motors. If 2x 2200 packs are getting pretty warm the plane must be pulling a lot of amps and watts. Worst case I will swap props out, maybe re-wind motors for best match.

B-24 Liberator at Ace in the Hole Event, in HD (4 min 22 sec)

Cheers -- Stacker
Last edited by stacker; Jul 23, 2011 at 11:05 AM.
Jul 23, 2011, 12:13 PM
In NY's beautifull hills
staggerwing's Avatar
What size are the Parkzone Corsair ?
Also, can anyone give a RTF weight of the 17 w/ lipo ?

Jul 23, 2011, 12:29 PM
6 months to finish a rtf
pulsery2k1's Avatar

I belive the proble or underpower is the props they are very flexable
and when I flew my mossie on the stock props it just about flew
and other's in the tread had switched to master airscrews
and had gotten good results so I tryed and now it flys great.
the props look nice but just don't work
Jul 23, 2011, 01:15 PM
Tally Ho!
kusunokimasahige's Avatar
Stacker thats one beautiful truck you built there !

Jul 23, 2011, 02:21 PM
jrb's Avatar
10x7x3; amp draw also posted in this thread: https://www.rcgroups.com/forums/show....php?t=1462786 .
Jul 23, 2011, 06:18 PM
Registered User
stacker's Avatar
Thanks, B-24 is the same scale as the B-17.

I believe the Parkzone prop. is a bit over 9". They are pretty stiff but have a larger center hole that will have to have a spacer. Might also be worth trying the old GWS 9" x 7 as they may be a little stiffer for a cheap price.

I will run some tests once mine shows up next week as I've already got both types of props. The other thread said 500 watts and that should fly the plane real well. Bet you guys are right, props are too flexible. I also believe the FMS B-25 props might work? I think they come as a set and also are counter rotation. Kinda pricy though.

Jul 23, 2011, 06:54 PM
B-17 freak
Vic Arcudi's Avatar

1st accurizing report

Having assessed what comes in the box with this kit, I've decided to go ahead and try to address the most glaring scale issues:
The port waist gun needs to be moved backward directly opposite the other, which is in the correct position for a B-17F.
The rudder should have a straight lower trailing edge, not curved.
The cockpit windshield needs lowering toward the center.
Them eyesore grilles placed over the escs have got to go (there's already plenty ducted air going thru where the esc's are placed). They'll be replaced with thin depron sheet & sanded flush.
The panel trenches need to be filled with spackle & sanded back.
Lastly, a total repaint is in order.
Thankfully I still have a set of Royal/Marutaka waterslide decals which are to the same scale.
I've already started removing some of the decals on the model. They just peel off (along with the underlying paint), so maybe I could try peeling off the rest with some scotch tape, lol.

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