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Jan 25, 2013, 06:29 PM
SCCA, EAA, M.E.
spinnetti's Avatar
Question

Modeling pros: How to make Shock (oleo) bellows?


As the title says, have any of you made scale shock/oleo bellows? I'm getting more and more comfy making scale working landing gear, but not found a reasonable way to make shock bellows yet (the ribbed cover that goes of the shock absorber).... Any tips/methods?

Thanks!
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Jan 25, 2013, 11:06 PM
Registered User
Kiwi's Avatar
Try the ribbed part of a "bendy" straw slipped over the wire leg
Jan 25, 2013, 11:59 PM
SCCA, EAA, M.E.
spinnetti's Avatar
Quote:
Originally Posted by Kiwi
Try the ribbed part of a "bendy" straw slipped over the wire leg
Thanks. interesting idea which would do in some cases, but there's no wire leg... Talkin' full scale here I need to mold them somehow in the correct diameter, length and number of pleats...
Jan 26, 2013, 12:59 AM
a.k.a Maltone
Pat Lynch's Avatar
I was wondering the same thing myself for future project. I'd seen the rubber moulding kits by MicroMark - might be worth a look!

http://www.micromark.com/tcr-40-tire...-lbs,8300.html

It may not be flexible enough..........

Pat
Jan 26, 2013, 07:48 AM
Registerd Beaver
Smokin' Beaver's Avatar
I'd say possibly scout around the boots that are made for r/c cars & boats suspension, cv joints and shaft covers.
They come in all shapes and sizes due to the scale differences.

eg.

http://www.hobbyking.com/hobbyking/s...Centurion.html
Jan 26, 2013, 01:45 PM
Registered User
Take a look at Vehicles? My Hondas: Moto and Autos have very neat little rubber bellows on their Cable ends... Could be just what you are after.
Jan 26, 2013, 02:03 PM
a.k.a Maltone
Pat Lynch's Avatar
Doh! I've just finished beating myself in the head! - Thanks guys - model car stuff.........Pat
Jan 26, 2013, 03:30 PM
SCCA, EAA, M.E.
spinnetti's Avatar
Thanks for the replies, but I'm not trying to find something close I'm looking for tips on Moulding them in exact scale shape and size....

Pat - Thanks for the rubber compound link...
Jan 28, 2013, 01:36 PM
Always Ready!
warhead_71's Avatar
What plane? What scale?

I would think you could simply lathe it from a rubber stopper (or hard foam rubber). Just run a shaft through the piece to be lathed and chuck it in your drill, then use a Dremel to cut the profile while the piece is spinning on the drill. It might require and extra pair of hands or a vise to hold your drill steady, but it's a quick way to make your parts without the time and expense of making molds.

Just looking through your blog, another thing you could do... and it's REALLY simple...you could just get the correct size spring and shrink-tube over it. Some shrink-tubing is hard when shrunk, and there are other types that remain flexible.

From what I can tell in the original drawing, those shocks have an external spring with a dust-boot over them. The boot appears to have a helical shape rather than an accordion "dust gator" like some motorcycles--which have the springs on the inside. Or am I reading that wrong? Maybe the shadows and the image being at an angle are throwing me off?

***edit****

Nevermind. Looking at this photo, I can see that there is no spring... it's just a typical accordion boot. And in other photos, I notice than most of the He-111's were missing the boot... they probably dry-rotted off and never got replaced.

Last edited by warhead_71; Jan 28, 2013 at 02:52 PM.
Jan 28, 2013, 05:44 PM
SCCA, EAA, M.E.
spinnetti's Avatar
[QUOTE=warhead_71;23959238]What plane? What scale?

I would think you could simply lathe it from a rubber stopper (or hard foam rubber). Just run a shaft through the piece to be lathed and chuck it in your drill, then use a Dremel to cut the profile while the piece is spinning on the drill. It might require and extra pair of hands or a vise to hold your drill steady, but it's a quick way to make your parts without the time and expense of making molds.

Just another thing you could do... and it's REALLY simple...you could just get the correct size spring and shrink-tube over it. Some shrink-tubing is hard when shrunk, and there are

From what I can tell in the [those shocks have an external spring with a dust-boot over them. The boot appears to have a helical shape rather than an accordion "dust gator" like some motorcycles--which have the springs on the inside. Or am I reading that wrong? Maybe the shadows and the image being at an angle are throwing me off?

***edit****

Nevermind. Looking at this photo, I can see that there is no spring... it's just a typical accordion boot. And in other photos, I notice than most of the He-111's were missing the boot... they probably dry-rotted off and never got replaced.
[\QUOTE]

Some good creative thinking.. Thanks for the ideas.. its not just for one type or size, just in general. I'm mostly in the 1/12, and 1/6 scale luftwaffe stuff... Just looking to round out my skill set


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