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Metric split pins (cotter pins) printer friendly version
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Bob Grimstead
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Posted Friday, July 1, 2011 @ 08:25 AM  

Hi Guys,

Does anybody (Eugenio, perhaps?) have a source for the tiny, hair-thin split pins that are used in various places on an RF4, but particularly through the four main engine mounuting bolts?

They are very thin, maybe 1mm, or more likely 0.8mm or something similar.

We do not seem to be able to get anything thinner than 1/16-inch here in England.

Any help would be appreciated.

Yours, Bob

--------------------
Flying and displaying Fournier RF4Ds VH-HDO and G-AWGN, building replica RF6B G-RFGB and custodian of RF6B prototype F-BPXV

SteveBeaver
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Posted Friday, July 1, 2011 @ 08:57 AM    YIM

3/64" are readily available here. Glad to send you some if you like.

http://www.mcmaster.com Search for part number 98401A915

Steve

Bob Grimstead
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Posted Monday, July 4, 2011 @ 11:30 AM  

Thanks very much Steve, but I can get 3/64" pins here OK.
They are 1.2mm diameter.

The ones I'm looking for are nearer 1mm, or 0.8mm, so they're 1/32" and I can't seem to find any.

Anybody else have a source?

Yours, Bob

--------------------
Flying and displaying Fournier RF4Ds VH-HDO and G-AWGN, building replica RF6B G-RFGB and custodian of RF6B prototype F-BPXV

dannparks
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Posted Monday, July 4, 2011 @ 11:48 AM  

Maybe a model hobby shop. Something that might be used in RC cars or planes.

--------------------
Dann Parks • RF4D #4051 N2188 • now flying!
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eugenio
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Posted Monday, July 4, 2011 @ 02:41 PM  

At Aircraft Spruce you can find small cotter pins (I do not know the diameter but they are really thin).
I personally prefere the stainless steel ones I can easily find here, they are harder.
In the case you cannot fit a cotter pin (sometimes happens) you can use 1 mm safety wire (stainless) it does the same service.

Eugenio

jb92563
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Posted Tuesday, July 5, 2011 @ 01:14 PM  

I got mine from aircraft spruce.

I'll remeasure with a caliper to confirm, but they did fit my engine mount bolts.

If you need some I can throw a dozen in an envelope and mail you some, think I bought a bag of hundred.

They are not stainless but perhaps brass I believe.

In any case they are non corrosive.

[Edit by jb92563 on Tuesday, July 5, 2011 @ 01:17 PM]

--------------------
Ray
RF4D #4057 N-1771 Rectimo 1400cc
http://picasaweb.google.com/jb92563/FournierRF4D
http://www.touringmotorgliders.org

eugenio
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Posted Tuesday, July 5, 2011 @ 02:28 PM  

Cad plated steel. I don't think brass cotter pins are used on aircraft, neither I think Aircraft spruce have it.
Indeed they are very soft and I don't like them on the small bolt that keeps the engine toghether with the fuselage.

Eugenio

jb92563
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Posted Wednesday, July 6, 2011 @ 03:18 PM  

You must be right Eugenio, as I doubt the pins are actually brass.

I should have said brass colored plating.

Mine are somewhat stiff as I can not bend them over easily with my finger, I have to use pliers.

I was suprised to see how thin the bolts are that hold the engine on.

They look like maybe 3 or 4mm bolts.

I guess they must have very good shear strength.

--------------------
Ray
RF4D #4057 N-1771 Rectimo 1400cc
http://picasaweb.google.com/jb92563/FournierRF4D
http://www.touringmotorgliders.org

eugenio
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Posted Saturday, July 9, 2011 @ 03:58 PM  

The four bolts are 5mm and are strong enough. Also the RF5 uses the same bolts, with a heavier and more powerful engine. Everything is correctly calculated.
If your cotter pins are stiff maybe they are stainless, this is why I prefere stainless instead of cad plated steel.

Eugenio

Donald
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Posted Tuesday, July 26, 2011 @ 11:47 AM  

LAS have metric split pins. http://www.lasaero.com/site/products/article?id=A00U528WT
Bob Grimstead
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Posted Tuesday, August 30, 2011 @ 11:51 AM  

Thanks very much Donald,

They're stainless steel and they fit perfectly.

They arrived the following day.

Now I have ordered LAS's catalogue and I shall inevitably start becoming a regular customer.

Yours, Bob

--------------------
Flying and displaying Fournier RF4Ds VH-HDO and G-AWGN, building replica RF6B G-RFGB and custodian of RF6B prototype F-BPXV

Donald
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Posted Tuesday, August 30, 2011 @ 12:44 PM  

Living at the other end of the UK I've always been astonished at how fast LAS can deliver. Even for me it's often the next day.
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