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Old Feb 27, 2002, 05:42 PM
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John Thompson's Removable Wing E3D


My mate JohnThompson came over with his nearly completed E3D which he has built beautifully with very neat removable wings.

He has made the wings in two halves and used the gap between the top and bottom spars for a 1/4 balsa sheet joiner. The fuse wing hole was filled in and slotted for the joiner. As the original wings size was used the span has been increased by the fuse width, and the wing area increased by about 32sq in.

The current airframe weight with motor, gearbox, prop, rx, and 2 servos is 32.25oz. We estimate the AUW with 10 RC2000 cells will be 56oz. John intends to fly it on these ansd smaller cells so I am sure the performance will be excellent.

Neil.
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Old Feb 27, 2002, 05:43 PM
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With the wing half removed...
Old Feb 27, 2002, 05:44 PM
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Both wings removed.
Old Feb 27, 2002, 05:44 PM
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Fuse closeup
Old Feb 27, 2002, 06:32 PM
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That's fantastic!!!

I may just have to saw my wing in half!!

Don
Last edited by DonH; Feb 27, 2002 at 06:46 PM.
Old Feb 28, 2002, 11:08 AM
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What covering did John use? especially the clear stuff, looks good and light.

Also, a few more grams can be saved by removing the cut outs in the canopy / hatch, or is there a reason they are left in?

Great ideas, in some ways I wish I had seen this before I finished my one piece E3D

Gary, how about asking John if it's Ok to include his idea in the instructions as an option.

Paul
Old Feb 28, 2002, 11:35 AM
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Well,.. I can't see how the 1/4" sheet balsa is really gonna hold the wing together and on the airplane. I don't plan on making the kit with removable wing anytime soon,.. but I've got that in mind for the future due to all the requests. at the moment, I have some other projects going though.
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Old Feb 28, 2002, 11:42 AM
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As the wing is quite thick.. If (when) I build one like that, I'd put 1/4" sq. spruce caps top and bottom on the 1/4" balsa tongue.. just for the bending loads which are highest at the root.
Old Feb 28, 2002, 03:30 PM
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> What covering did John use? especially the clear stuff, looks good and light.

The clear covering John used is Tom Hunt's Doculam.

> Also, a few more grams can be saved by removing the cut outs in the canopy / hatch, or is there a reason they are left in?

John found these holes aesthetically displeasing, and didn't think the weight saving was worth it.

> Great ideas, in some ways I wish I had seen this before I finished my one piece E3D

Thanks. I'll pass on your comments to John. I intend to use the same method on my E3D!

Neil.
Old Feb 28, 2002, 03:40 PM
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Quote:
Originally posted by Sparky Paul
As the wing is quite thick.. If (when) I build one like that, I'd put 1/4" sq. spruce caps top and bottom on the 1/4" balsa tongue.. just for the bending loads which are highest at the root.
Thanks for your suggestion. As as a result of your and Garry's comments John has decided to make another joiner with spruce caps.

Neil.
Old Feb 28, 2002, 08:48 PM
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Without doing the math and figuring out the bending loads and gee forces, I would still have to say you might have a problem with just the spruce caps. The balsa will not take the load and you are counting on the glue joint between the balsa and spruce to hold up. This might be a problem due to landing stresses. I would put 1/64th ply on the sides and wrap in 1. 4 ounce cloth.

Keep in mind this is just a very rough estimate but done properly the weight increase would be under 1 ounce and the strength both under flight loads and hard landings would be enhanced.

I assume that the wing tongue is held into a box on both sides? The loads from this tongue are distributed evenly and spread out with no stress risers?
Old Mar 01, 2002, 10:21 AM
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Neil
Thanks for posting that - I say a few choice Anglo-Saxons every time I slot mine into the car

Is there any kind of carry-through box in the fuselage, or does that 1/4" joiner just pass through slots in the sides?

I dealt with the holes in the 'canopy' with pieces of solid colour sticky trim. Whatever, this is my last see-through RC model! Regardless of Gary's views on the aesthetics, some things should be hidden, IMO, and the insides of aircraft (especially mine!) are on that list.
Old Mar 01, 2002, 10:25 AM
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Re: John Thompson's Removable Wing E3D


Quote:
Originally posted by Neil Stainton
He has made the wings in two halves and used the gap between the top and bottom spars for a 1/4 balsa sheet joiner. .
Are you sure that is a balsa joiner? I can't see it taking much stress. I would expect that it is 1/4" aircraft plywood.

Can you confirm?

Dave
Last edited by Dave Seay; Mar 01, 2002 at 10:27 AM.
Old Mar 01, 2002, 12:02 PM
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Quote:
Originally posted by sal
Without doing the math and figuring out the bending loads and gee forces, I would still have to say you might have a problem with just the spruce caps. The balsa will not take the
Spruce caps, in my opinion, can take all the load. It's not a heavy airplane...

The balsa could be there just to keep those caps apart from each other. They will take all the load (perhaps the load of four E3D )

I don't have lots of experience, but all my planes could be shaked from wing tips without bending the wing! Yes, I know, I overbuilt them...
My Twinstar scares me because just holding the plane from wing tips will bend the wing!!! A lot!!!
When I think about what I do with it in the air......
The "caps" in my Twinstar are... tape made!

See the "spar" system I used in my Sport 600 to reinforce the wing (site below) - I don't think the spar is necessary. If I didn't use a spar (like I did in Capiche) I would have 1,5mm (1/16") balsa taking the load and that would be sufficient... thinking of it, 0,8mm (1/32") balsa would be enough.
Old Mar 01, 2002, 04:06 PM
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Quote:
Originally posted by Dereck
Neil


I dealt with the holes in the 'canopy' with pieces of solid colour sticky trim. Whatever, this is my last see-through RC model! Regardless of Gary's views on the aesthetics, some things should be hidden, IMO, and the insides of aircraft (especially mine!) are on that list.
I've built many see-through planes, especially the funfly types. I always think it's a shame when I start covering a model. I always try to keep the construction clean-looking, even in areas that won't be seen when the plane is finished.
Why? First, I take pride in my work when I arrive at the field and the guys over there start to comment on how nice the plane is built. And second, building things that way also assures that they are built the right way. Everything fits well, no gaps on glue joints (CA!!!), no exess glue, things like that. It just feels better knowing everything is in place when you start stressing the plane to its limits...


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