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Foam hand kids glider converted to 0.049 CL - Page 2 Cox_ba12





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Foam hand kids glider converted to 0.049 CL - Page 2 Empty Re: Foam hand kids glider converted to 0.049 CL

Post  GallopingGhostler Sat May 13, 2023 12:14 pm

I find it interesting that Andrew, Rod's friend down under uses no nitro fuel on his Cox. I never tried this before, because use of no nitro fuel is virtually unheard of in the circles (pun intended) I flew with, all used nitro to varying degrees, due to its availability here in the Continent. Also, I didn't know it was possible. It also may explain why Andrew had good success flying his powered glider creation. Under reduced power helped it to match up with the reduced wing area.
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Foam hand kids glider converted to 0.049 CL - Page 2 Empty Re: Foam hand kids glider converted to 0.049 CL

Post  layback209 Sat May 13, 2023 12:18 pm

Oh wow is there some exiting stuff going on with these hand bomb foamies. lol!

Thanks for connecting with thd builder, oldenginerod.  

I actually found one of these foamies things in our shed yesterday.

Here is another photo of the stiffening and control layout.

Foam hand kids glider converted to 0.049 CL - Page 2 Screen20

I kinda want to build a pile of these and hand them out / get folks in the air when the public stops to chat with us when we are flying.
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Foam hand kids glider converted to 0.049 CL - Page 2 Empty belcrank on cg?

Post  cmulder Sat May 13, 2023 2:23 pm

Never designed a cl model before so would like to know if the cg for cl models is the same as "free flight"?
The one sold by lidl glides well with about 5g added weight resulting in a cg 30mm from the leading edge.
Is that where the bellcrank (the goldberg 1/2A one) should be mounted?
And then have the leadout guide the same spacing as the bellcrank ?
I am wondering if the long strip "spar" can be replaced with glassfibre tape and then the whole wing/fuse with thin clear packing tape.
(like the "ZAGI" used to be)

Might get a third one and just "give it a go" like the natives here like to say
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Post  aspeed Sat May 13, 2023 2:54 pm

cmulder wrote:Never designed a cl model before so would like to know if the cg for cl models is the same as "free flight"?
The one sold by lidl glides well with about 5g added weight resulting in a cg 30mm from the leading edge.
Is that where the bellcrank (the goldberg 1/2A one) should be mounted?
And then have the leadout guide the same spacing as the bellcrank ?
I am wondering if the long strip "spar" can be replaced with glassfibre tape and then the whole wing/fuse with thin clear packing tape.
(like the "ZAGI" used to be)

Might get a third one and just "give it a go" like the natives here like to say
Control line planes are normally a bit more nose heavy than RC or FF. Maybe 20% of the chord. The leadouts can be fairly close together, maybe 10mm or so, any closer they could maybe bind with each other. Not so important to have them too far apart as when doing stunts the back one will bank out more than the other direction banking in. (bad) Start about half way back to allow for the line drag. Where the bellcrank is mounted is not as important as the leadout guide, but halfway in the chord is fine, mostly just so it will not bind or bend the leadouts too far. My flea fright one was very tail heavy and did not fly well. I put a bolt in the front for nose weight and then it seemed like it needed more dihedral. May be better to be control line. Never tried the cheaper white foam one, not sure if I have one, may have to search. I have some of the bigger ones, and had considered electric. I like the option of aborting the landings, and we have a height limit here of 400 ft. For the strip stiffening the wing, IDK if the fiberglass tape would make a lot of strength difference because the wing is pretty thin. I thought maybe the birch edge banding strips for shelves might be something to try. It is the iron on type. Of course you could try it with nothing and see if it is needed. What is the worst that could happen? Lose a bit of glue or $7?
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Foam hand kids glider converted to 0.049 CL - Page 2 Empty Re: Foam hand kids glider converted to 0.049 CL

Post  andrew Sat May 13, 2023 11:43 pm

These can be found with a little online searching for next to nothing on price.

Here's a site:  Foamy Glider

The foam is not the typical expanded styrene, but the more flexible material.

Foam hand kids glider converted to 0.049 CL - Page 2 Anko_f10
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http://web2.murraystate.edu/andy.batts/ps/POWERSUPPLY.HTM

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Post  Oldenginerod Sun May 14, 2023 1:04 am

As promised, here's more shots of the plane.  

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Foam hand kids glider converted to 0.049 CL - Page 2 Img_2078


As I recall, nose was cut off square 95mm from the tip.  Engine has no offset.  
Note the two pegs on the rear of the engine mount in the drawing.  These slot into corresponding holes in the fuse and everything is glued with 5 minute Epoxy.  Rudder has a little offset as pictured.

Landing gear is just sandwiched between two pieces of ply and glued into a slot cut in the lower half of the fuse.  Andrew tells me that this thing has smacked the ground very hard on a few occasions and has come out completely unscathed.  I had a theory that the gear would snag the grass and break the fuse in half- That hasn't happened.

The effect of Nitro on the foam hasn't been tested as Andrew uses no Nitro.  Otherwise, fuel has so far had no ill effects on the foam.

Note wing and stab have ply bracing. Bellcrank mount appears recessed into the wing and Andrew says it's located one third way back from the leading edge.

Elevators are joined with a piece of bent wire and hinged on stadard type Du-Bro hinges. Not a ply tail skid has been added. Note that excess material from the removed nose has been carved to neatly fill the upper stabiliser slot.  Apparently a small amount of lead has been added to the tail.  If the same dimensions were used, maybe a 5cc Babe Bee tank would balance just right rather than Andrew's 8cc one.

Many at Andrew's club were sceptical and gave him a hard time when he first tried to explain the concept.  His maiden flight shut them up.
It is very light, very stable, very aerobatic, very cheap and very durable.  What more could you ask for??
His comment was also that because balsa is getting harder to source, this isn't a bad alternative.

Here's a challenge guys. Who'll be the first on CEF to complete and demonstrate their own version?

Rod.
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