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Aluminium bolts

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Old 02-22-2012, 01:13 AM
  #1
cartercg
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Default Aluminium bolts

Hi,

One way to save a bit of weight is to use Aluminium bolts, nuts etc for motor mounts, landing gear attachments etc. Aluminium is way lighter than stainless steel. Titanium is extremely strong but the weight is in-between Aluminium and Stainless steel and Titanium is a lot more expensive. So from a weight perspective Aluminium is the best, but is it strong enough? Have you guys been using say 3mm Aluminium bolts for the likes of landing gear attachments and if so have you had any unexpected failures?

Regards
Clint
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Old 02-22-2012, 02:36 AM
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Default RE: Aluminium bolts

I use titanium screws. I also use aluminium lock nuts and washers.

I would never use aluminium on an undercarriage.

Cheers,
Jason.
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Old 02-22-2012, 04:21 AM
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Default RE: Aluminium bolts

Hi
I have been using aluminium 4/40 bolts to mount my undercarriage for years with no failures I also use them to mount the motor where appicable again with no problems
John
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Old 02-22-2012, 04:30 AM
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Default RE: Aluminium bolts

On the undercarriage I use Aluminium in the rear bolts an nylon in the front. They brake before the plane does.
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Old 02-22-2012, 06:18 AM
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Quote:
ORIGINAL: mtcarey

On the undercarriage I use Aluminium in the rear bolts an nylon in the front. They brake before the plane does.
I've heard of this idea but won't ever use it myself.

Even if the gear break away you're going to do extensive damage to the side of the fuse where the gear insert, and potentially even more to the belly of the fuse.

I'd rather crack the landing gear than damage the fuse!
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Old 02-22-2012, 07:23 AM
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Default RE: Aluminium bolts

You guys still use bolts to mount your landing gear?? How...old fashioned, hehehe
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Old 02-22-2012, 08:24 AM
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Quote:
ORIGINAL: MTK

You guys still use bolts to mount your landing gear?? How...old fashioned, hehehe
Glad to hear that the use of landing gear isn't obsolete yet
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Old 02-22-2012, 09:35 AM
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Quote:
ORIGINAL: MTK

You guys still use bolts to mount your landing gear?? How...old fashioned, hehehe
Pony up! Let's see pix!!
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Old 02-22-2012, 02:01 PM
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Default RE: Aluminium bolts


Quote:
ORIGINAL: cmoulder


Quote:
ORIGINAL: MTK

You guys still use bolts to mount your landing gear?? How...old fashioned, hehehe
Pony up! Let's see pix!!
My money's on pop rivets
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Old 02-22-2012, 02:05 PM
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Default RE: Aluminium bolts


Quote:
ORIGINAL: bjr_93tz


Quote:
ORIGINAL: cmoulder


Quote:
ORIGINAL: MTK

You guys still use bolts to mount your landing gear?? How...old fashioned, hehehe
Pony up! Let's see pix!!
My money's on pop rivets
Oh my goshki.....What's the matter with you boys? You can't think outside the box can you?

No fasteners at all
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Old 02-22-2012, 08:38 PM
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Default RE: Aluminium bolts


Quote:
ORIGINAL: MTK


Quote:
ORIGINAL: bjr_93tz


Quote:
ORIGINAL: cmoulder


Quote:
ORIGINAL: MTK

You guys still use bolts to mount your landing gear?? How...old fashioned, hehehe
Pony up! Let's see pix!!
My money's on pop rivets
Oh my goshki.....What's the matter with you boys? You can't think outside the box can you?

No fasteners at all
Hot melt glue [X(]
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Old 02-23-2012, 03:51 AM
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Default RE: Aluminium bolts

I'm thinking about using aluminum bolts for my rear motor mount - 1 3/4" bolts inside a spacer. I've struggled with aluminum prop adapters, but the loads are pretty different here.
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Old 02-23-2012, 06:40 AM
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Default RE: Aluminium bolts


Quote:
ORIGINAL: bjr_93tz

Hot melt glue [X(]
I'll clue you in....no screwy screws or nuts n bolts, and no frigging glue

Now that the cat is out of the bag, you may be able to figure out the mechanics of the system I've developed. BTW - The concept is patent pending and I will be looking to license it
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Old 02-23-2012, 06:48 AM
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Default RE: Aluminium bolts

heres a link to aluminum fasteners made from 7075 t-6 which is about 85.000 psi tensil  http://www.fastener-express.com/alum...s-washers.aspx. a alloy steel socket head cap screw manufactured to standards is about 180,000 tensil
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Old 02-23-2012, 07:48 AM
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Default RE: Aluminium bolts

A Kabajian Taper?
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Old 02-23-2012, 08:08 AM
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Default RE: Aluminium bolts

Or caper!
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Old 02-23-2012, 10:08 AM
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Default RE: Aluminium bolts

Naaaa.....more like rubber bands....I heard about that guy!
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Old 02-26-2012, 09:22 AM
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Default RE: Aluminium bolts

I've developed quite a niffty landing gear system myself. I believe in keeping parts in tension to achieve maximum strength.

Landing gear on model planes is poorly thought out
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Old 02-26-2012, 05:59 PM
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Default RE: Aluminium bolts

I thought pattern pilots will never damage the landing gears:-)

On a serious note, I like the idea of replacing four front steel motor mount mounts with itanium counterparts. Seems a good way to spend a couple dollars to cut 1oz. Of weight.

I use aluminum bolts to hold wing tip blocks to the wing body on my Passport.

BTW, I still have some spare 1" 4/40 alum socket bolts from bolts-express.com. Send me PM and I can mail you 10 for $3 shipped to cont. USA.
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Old 02-27-2012, 08:15 AM
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Default RE: Aluminium bolts


Quote:
ORIGINAL: TimBle

I've developed quite a niffty landing gear system myself. I believe in keeping parts in tension to achieve maximum strength.

Landing gear on model planes is poorly thought out

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Old 02-27-2012, 08:26 AM
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Default RE: Aluminium bolts

I'mnot going to dismantle the entire bottom of my plane. Oh wait, I'll be fitting a Saito 180 to a 1.20 size pattern plane so I'l have to.

wait 24hrs
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Old 02-27-2012, 08:30 AM
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Default RE: Aluminium bolts

www.pro-bolt.co.uk

for ti and Al bolts and nuts and washers
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Old 02-27-2012, 07:32 PM
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Default RE: Aluminium bolts

Quote:
ORIGINAL: TimBle

I've developed quite a niffty landing gear system myself. I believe in keeping parts in tension to achieve maximum strength.

Landing gear on model planes is poorly thought out
WIST MODEL has the very best commercial technique. My method was inspired by them. The lightest set-up in my plane for gear, pants, axles and wheels and fuse mount was around 5 1/2 ozs

The very lightest landing gear had to be Nat Penton's. He mounted a pair of carbon tubes through the wing. The wing mounts are 1/32" ply plates, about 3 sq inches on both sides of the wing, with a through hole or socket connecting the two plates.

The carbon tube has more than enough strength and flex to handle 11 pounders. All up weight, including everything, was around 3 ozs. That's a fine weight...juuuuust a little out of the box thinking
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