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Old Oct 10, 2012, 02:51 PM
Santa Cruz, Bolivia
chugo's Avatar
Bolivia, Santa Cruz, Santa Cruz de la Sierra
Joined Aug 2008
13 Posts
Apologize to everyone if I'm wrong, my native language is Spanish, but from what I could understand, could be considered as mayor factor in the crash the fact that CF rods for reinforcement was not glued to wing and also the pylon (only part of it)??....

The solution will only be sure of glue the CF rods and the pylon??.. or will be necessary to add some more CF above and below the wing????... I am planing to paint my plane above silkspan w/ WBPU which is less resistant than fiberglass/epoxy resin.

A little worried too!!
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Old Oct 10, 2012, 05:24 PM
Paul B
Australia, TAS, Launceston
Joined Dec 2009
352 Posts
This is exactly why I covered my wings with 3/4oz fiberglass cloth and WBPU. That, along with the extra 6mm x 1.5mm carbon strip reinforcing from root to tip has given me confidence in the wing structure.

I used 1 piece of fiberglass to cover the entire top of the wing and 1 piece to cover the entire bottom of the wing.

Paul
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Old Oct 10, 2012, 05:36 PM
Santa Cruz, Bolivia
chugo's Avatar
Bolivia, Santa Cruz, Santa Cruz de la Sierra
Joined Aug 2008
13 Posts
Paul

How much weight gain your plane with fiberglass?...will be my first time using silkspan, will be much the weight difference using this material instead of fb??

Carlos Hugo
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Old Oct 10, 2012, 06:26 PM
Paul B
Australia, TAS, Launceston
Joined Dec 2009
352 Posts
Mine is around the 8lb mark. I have used high end edf units to give me more thrust to allow for the extra weight.
Silk span should be good enough with WBPU to gain extra strength
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Old Oct 10, 2012, 07:07 PM
6 months to finish a rtf
pulsery2k1's Avatar
upstate ny
Joined Jun 2003
1,832 Posts
The Failure of wing had nothing to do with covering, some are flying
with no covering at all and have had no failures.

the one fix I will do is to use a longer 5 mm carbon main rod.
to go behond the engine pod

Major12

well untill you know the amp draw of the motor and fan its hard
to say what esc you would need .

if you used a pair of the stock cs fans the esc's would most likly be fine
then you would just need batterys
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Old Oct 10, 2012, 07:14 PM
Registered User
Future Wingz's Avatar
United States, WA, Seattle
Joined Aug 2012
73 Posts
Battery Pack Placement

Hello Gents,

Paul B, Doug W, Manny, pulsery2k1, Guys in relation to the recommended CG, where have you been able to place your power packs in order to achieve the optimum balance point? Any pointers shall be highly appreciated.
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Old Oct 10, 2012, 10:30 PM
Paul B
Australia, TAS, Launceston
Joined Dec 2009
352 Posts
My CG is set right where your pictures show. I had to place my battery quite a way forward in the fuse to achieve it. I am running 4x flap servos and 4x spoiler servos which might explain why the battery has to be further forward than I anticipated

Paul
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Old Oct 10, 2012, 10:38 PM
Registered User
Doug W's Avatar
United States, WA, Seattle
Joined Jul 2010
434 Posts
Quote:
Originally Posted by Pannoch RC View Post
My CG is set right where your pictures show. I had to place my battery quite a way forward in the fuse to achieve it. I am running 4x flap servos and 4x spoiler servos which might explain why the battery has to be further forward than I anticipated

Paul
I second Paul's comment- the CG is the same spot for me- and I too needed my battery pack far forward. Wedgetail in particular I needed the battery pack forward and so built a removable tray of depron that I velcro the battery to and slide it in and out of the fuse. It locks down within the fuse once in place. The tray has allowed me to place the battery pack more forward than I could reach with my hands.

Paul and I have the same wing/flap set up, so that does indeed account for the battery pack forward. Easy rule of thumb I use before every flight is once everything is set up, I pick the model up off the ground (keeping it wheels down) with two fingers- one placed over the first window BEHIND the exit row door. If it "roughly" balances, you're good.

Paul- have you flown your plane yet? Status update?
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Old Oct 10, 2012, 10:44 PM
Registered User
Doug W's Avatar
United States, WA, Seattle
Joined Jul 2010
434 Posts
Quote:
Originally Posted by pulsery2k1 View Post
The Failure of wing had nothing to do with covering, some are flying
with no covering at all and have had no failures.
Pulsery is correct- covering had nothing to do with failure. Just run the additional carbon fiber rod THROUGH the wooden engine bearer and you're fine. I have 40+ flights between by two 737s and they are exactly as built, no weakening. Tutorial below shows the carbon fiber placement (the wings in this video are the wings on my RC Wedgetail):

RC 737 Flaps Tutorial (Prequel 1) (4 min 23 sec)


That said, I have no intention of ever looping either of them. That G-load would snap a wing no matter how good the reinforcement. To my knowledge, Boeing doesn't loop their 737s as part of certification anyway.

(But they have rolled the 707 on occasion)
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Old Oct 11, 2012, 12:39 AM
Ming's Avatar
Hong Kong
Joined Jun 2002
4,576 Posts
Doug

I am really like your over the top great work.
If we going to make 747, I have to follow...thank you!

Ming Lou
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Old Oct 11, 2012, 04:50 AM
Paul B
Australia, TAS, Launceston
Joined Dec 2009
352 Posts
Quote:
Originally Posted by Doug W View Post
.........Paul- have you flown your plane yet? Status update?
Status update is the plane is ready to go. The weather has not been good for maiden flights. That, along with working 6 days a week at the moment is having its toll on flying time.
It will happen though...

Paul
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Old Oct 11, 2012, 08:10 AM
Fly and let Fly!
Cocg's Avatar
United States, CO, Grand Junction
Joined May 2010
1,962 Posts
Quote:
Originally Posted by Ming View Post
Doug

I am really like your over the top great work.
If we going to make 747, I have to follow...thank you!

Ming Lou
747? Yepper! Please!
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Old Oct 11, 2012, 09:24 AM
Registered User
Highfly!'s Avatar
United States, CA, Cameron Park
Joined May 2007
1,258 Posts
+1 on a 747 preferably same scale as 737
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Old Oct 11, 2012, 09:33 AM
Landin' On The Canopy BAD
F-86FLIER4LIFE's Avatar
Lee's Summit, MO
Joined Jan 2008
1,481 Posts
+1 large scale 747, 90in wingspan!
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Old Oct 11, 2012, 09:38 AM
Fly and let Fly!
Cocg's Avatar
United States, CO, Grand Junction
Joined May 2010
1,962 Posts
What a thread that would make Ming..!!!
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