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Scans of my Lil Wizard rubber band engine mount

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Scans of my Lil Wizard rubber band engine mount

Post  pkrankow on Thu Oct 11, 2012 10:43 am

This is a set of scans of my Lil wizard rubber band mount. The plane is 30 years old. I measured and dimensioned the images. They can be reproduced from 1/8 inch plywood. I have found this mount allows for 2 things
preservation of a trainer in crashes, the engine mount rubber bands "give" instead of things breaking
ability to use the same engine on several models with little effort at the field

Enjoy

Phil

https://i.servimg.com/u/f34/17/84/87/39/front10.jpg
https://i.servimg.com/u/f34/17/84/87/39/backda10.jpg
https://i.servimg.com/u/f34/17/84/87/39/back11.jpg
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Re: Scans of my Lil Wizard rubber band engine mount

Post  RknRusty on Thu Oct 11, 2012 11:21 am

Very nice. I've thought about making a rubber band mount but never got around to it. Yours is better than what I would have come up with. I saved your pictures in my airplane folder. Good first post, thanks.

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Re: Scans of my Lil Wizard rubber band engine mount

Post  Cribbs74 on Thu Oct 11, 2012 1:49 pm

Cool, thanks for that. I have been looking for one forever. Thought about making one out of ply and now I have the dimensions!

Ron
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Re: Scans of my Lil Wizard rubber band engine mount

Post  pkrankow on Thu Oct 11, 2012 6:13 pm

Honestly I would love to see someone having these laser cut, including bulkheads, which are identical to the back of the engine mount.

I have a miserable time cutting these accurately out of plywood.

Phil
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Re: Scans of my Lil Wizard rubber band engine mount

Post  Ken Cook on Thu Oct 11, 2012 6:41 pm

In my opinion, the Lil Wizard is a bullet proof design unless your flying on asphalt or concrete. Out of all the planes I've even built from yesteryear it's one of the few 1/2A's I have remaining. The design of that mount really didn't save the plane. The ply bulkhead was glued to balsa which faired into the fuse. The balsa now breaks slightly behind the ply. The other problem is that rubber bands exposed to fuel and oil rapidly breaks down. The engine and that plastic firewall now departs when the rubber gives up. This happened to me on mine years back. It didn't go far, but I'm glad it didn't happen when I was in front of it. I found that any of the Goldberg rubber band setups generally were more of a hinderance than a help. This is especially true on the bungee gear setups. Ken
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Re: Scans of my Lil Wizard rubber band engine mount

Post  Godsey3.0 on Thu Oct 11, 2012 7:23 pm

I love the rubber band on mounts. I made quite a few copies. I changed rubber bands periodically. I also always pull on the engine a bit to make sure it is snug. I like the nylon mount best but the ply copy works just as well.

Rolla
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Re: Scans of my Lil Wizard rubber band engine mount

Post  Tinker Terry on Sun Oct 26, 2014 12:18 pm

Phil that's the nylon mount I have. How are the rubber bans configured and what size bands?
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Re: Scans of my Lil Wizard rubber band engine mount

Post  batjac on Sun Oct 26, 2014 12:32 pm

Tinker Terry wrote:Phil that's the nylon mount I have. How are the rubber bans configured and what size bands?

Me, too. Can someone post a picture of the proper way to rubber band one of these mounts. All the pictures I've seen are too distant to get a good idea of the proper banding method. How many bands? How tight? What order is the band wrapped around the tabs? Is it really that important?

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Re: Scans of my Lil Wizard rubber band engine mount

Post  Tinker Terry on Sun Oct 26, 2014 1:01 pm

Found this pic on hip pocket aeronautics for of a little wizard with the bands shown pretty clearly
http://www.hippocketaeronautics.com/images/control_line_images/cl_lil_wizard.gif
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My L'il Wizard Motor Mount

Post  Paulgibeault on Sun Oct 26, 2014 3:12 pm

How's this??  Just 2 small rubber bands just wrapped back & forth...

Cheers, Paul

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Tinker Terry wrote: How are the rubber bans configured and what size bands?
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Re: Scans of my Lil Wizard rubber band engine mount

Post  pkrankow on Sun Oct 26, 2014 7:03 pm

You are using a skinnier band than I do. I have been using the same size I hold wings on my RC stuff (#64 I believe). The wider band requires care because it is possible to seal off the intake to the engine!

My technique is exactly the same though.

Phil
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Re: Scans of my Lil Wizard rubber band engine mount

Post  rogermharris on Sun Mar 29, 2015 5:08 pm

pkrankow wrote:Honestly I would love to see someone having these laser cut, including bulkheads, which are identical to the back of the engine mount.  

I have a miserable time cutting these accurately out of plywood.  

Phil

if i can lay this out properly i wouldn't mind cutting some out. not really understanding the dims listed on the pics. also what about the engine mount being cut from delrin instead of plywood? 
one of my toys at work is a laser Thumbs Up
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Re: Scans of my Lil Wizard rubber band engine mount

Post  pkrankow on Sun Mar 29, 2015 6:07 pm

3 years later I don't remember what the dimensions listed are...LOL

OK, The pictures are sideways to use.  Paul pictured it in use on an airplane.  The firewall on the plane is 1/8 plywood, there is actually a step in the part the engine attaches to, with the ears thinner.  Without the step the rubber bands choke the engine, and it is very difficult to arrange otherwise.

I would be perfectly happy with 3 pieces of high quality 1/8 inch plywood, some assembly required.

If I had to work from those scans I would use the largest dimension and scale the picture, then measure the picture to the nearest 1/32

Another, possibly better way to get to true scale is to consult the manuals for the bee engines
http://coxengines.ca/engine-and-fuel-guides.html
the holes in the plate match up exactly to the engine dimensions.  Of course the mounting for a bee, and a horseshoe, and others...

This would also account for plastic shrinkage over the decades.

In truth the plate does not have to EXACTLY look like this, just serve the same function, so some liberty in the actual shape of the ears can be taken.

That is a cool toy you have there.

Phil
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Re: Scans of my Lil Wizard rubber band engine mount

Post  RknRusty on Sun Mar 29, 2015 6:36 pm

Paul's plane looks like there is a 1/16" doubler(balsa, maybe?) behind the wing where these fuselages so commonly break. If I built one for a beginner, I would also use 1/32" or 1/64" ply doublers on the front end extending from the firewall under the fairings to back just aft of the wing root. It would be good to use wood glue for weight saving reasons, at least for the rear ones. I'd epoxy the front doublers though.
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Re: Scans of my Lil Wizard rubber band engine mount

Post  rogermharris on Sun Mar 29, 2015 6:38 pm

pkrankow wrote:3 years later I don't remember what the dimensions listed are...LOL

OK, The pictures are sideways to use.  Paul pictured it in use on an airplane.  The firewall on the plane is 1/8 plywood, there is actually a step in the part the engine attaches to, with the ears thinner.  Without the step the rubber bands choke the engine, and it is very difficult to arrange otherwise.

I would be perfectly happy with 3 pieces of high quality 1/8 inch plywood, some assembly required.

If I had to work from those scans I would use the largest dimension and scale the picture, then measure the picture to the nearest 1/32

Another, possibly better way to get to true scale is to consult the manuals for the bee engines
http://coxengines.ca/engine-and-fuel-guides.html
the holes in the plate match up exactly to the engine dimensions.  Of course the mounting for a bee, and a horseshoe, and others...

This would also account for plastic shrinkage over the decades.

In truth the plate does not have to EXACTLY look like this, just serve the same function, so some liberty in the actual shape of the ears can be taken.

That is a cool toy you have there.

Phil

i'm going to explore this a bit and see what i can come up with. a side from the laser i have a cnc router table
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Re: Scans of my Lil Wizard rubber band engine mount

Post  pkrankow on Sun Mar 29, 2015 7:09 pm

Lots o' toys then!

Phil
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Re: Scans of my Lil Wizard rubber band engine mount

Post  GallopingGhostler on Mon Mar 30, 2015 6:55 am

pkrankow wrote:This is a set of scans of my Lil wizard rubber band mount.  The plane is 30 years old.  I measured and dimensioned the images.  They can be reproduced from 1/8 inch plywood.  I have found this mount allows for 2 things, preservation of a trainer in crashes, the engine mount rubber bands "give" instead of things breaking ability to use the same engine on several models with little effort at the field. Enjoy - Phil



Interesting, thanks Phil. I think the set of extra holes is to mount the Testors 049 Red Head with plastic tank mount. There's been other ways, such a what Ace R/C used on their 2 channel Grasshopper trainer. It used #3 sheet metal screws in the sides of the ply engine and firewall mounts similar in concept. Goldberg's method was simplicity, which I like.

Paulgibeault wrote:How's this??  Just 2 small rubber bands just wrapped back & forth... Cheers, Paul

Sharp looking Wizard, Paul. What Cox variant engine is that?

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Re: Scans of my Lil Wizard rubber band engine mount

Post  rogermharris on Mon Mar 30, 2015 9:05 am

How does this look Phil? About 90 seconds to cut

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Re: Scans of my Lil Wizard rubber band engine mount

Post  pkrankow on Mon Mar 30, 2015 10:19 am

I would prefer the hole to be markings or very small pilots instead of fully made. Might be me, but I like drilling my own.

The center being left solid would allow for better gluing of the two pieces.

Those look awesome!

Phil



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Re: Scans of my Lil Wizard rubber band engine mount

Post  rogermharris on Mon Mar 30, 2015 10:26 am

pkrankow wrote:I would prefer the hole to be markings or very small pilots instead of fully made.  Might be me, but I like drilling my own.

The center being left solid would allow for better gluing of the two pieces.  

Those look awesome!

Phil




thanks phil... i was thinking small holes for the next run myself. these may look bigger than they are (.060") and of course the bulkhead does not need hole. next gen coming up!
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Re: Scans of my Lil Wizard rubber band engine mount

Post  70sChild on Mon Mar 30, 2015 11:10 am

Great Info!
Thanks Paul,I have a couple of these that were included with an engine lot I purchased and did not know how one would attach it or what kind of model it was from. Beer Cheers

Steve
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Re: Scans of my Lil Wizard rubber band engine mount

Post  rogermharris on Mon Mar 30, 2015 11:12 am

Here yo go. Holes are .020"
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Re: Scans of my Lil Wizard rubber band engine mount

Post  rogermharris on Mon Mar 30, 2015 11:38 am

Shot of the back so that you can better see the hole size
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Re: Scans of my Lil Wizard rubber band engine mount

Post  pkrankow on Mon Mar 30, 2015 11:48 am

I like.

Any idea the price?

Phil
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Re: Scans of my Lil Wizard rubber band engine mount

Post  rogermharris on Mon Mar 30, 2015 11:56 am

I will figure something out price wise.  Since these will be generally used on trainers I will do them for cost of material and shipping. Should be able to stick them in a regular envelope and a stamp. Pm me your address Phil and I would be happy to mail you a couple.

also... what size screws for mounting the engine and what size rubber bands?


Last edited by rogermharris on Mon Mar 30, 2015 12:10 pm; edited 1 time in total (Reason for editing : additional question)
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