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What is typical prop and shaft size

Old Marine Engine » One and Two Cylinder Gas Inboards » What is typical prop and shaft size « Previous Next »

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narrabay
Member
Username: narrabay

Post Number: 29
Registered: 02-2016
Posted on Friday, March 11, 2016 - 01:37 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi all, More somewhat newb questions, I am wondering what is the typical shaft size from the period of these single cylinder engines? I see what looks like 10-12" wheel, not sure about the shafts, guessing 3/4"

also what is common shaft log stuff box diameter that the rubber hose section clamps on? I'm going to guess 2"

thanks!
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preventec47
Member
Username: preventec47

Post Number: 6
Registered: 08-2016
Posted on Monday, August 22, 2016 - 08:36 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Those are good questions.... Where are museums that house the greatest number of these boats because we are going to have to go and take the measurements ourselves.
Scottinfoinfo
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kayak
Member
Username: kayak

Post Number: 18
Registered: 06-2016
Posted on Saturday, August 27, 2016 - 11:34 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I was the original poster and since that time have come to the conclusion that 3/4" is the best all around size. 1/2" would in my view be too flimsy and easily bent, and 1" is for most low hp applications too heavy. There is 7/8" but not quite as common (going by marine consignment shop inventory, and searches). I went with 1" because it was common, only a couple extra pounds and I tend to overbuild things in an almost Soviet fashion!
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david_doyle
Senior Member
Username: david_doyle

Post Number: 74
Registered: 03-2013
Posted on Saturday, August 27, 2016 - 01:39 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Would really like to hear/see how the machining of this shaft/fitting of joints etc is carried out. Especially the taper.

If you could post some notes on challenges/successes that would be appreciated.

I am guessing you have not drug home a rusty/worn 9 inch lathe yet?
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kayak
Member
Username: kayak

Post Number: 19
Registered: 06-2016
Posted on Saturday, August 27, 2016 - 05:14 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi Dave, the only taper is at the prop. I bought a approx 4ft 1" diameter prop shaft at consignment which already fits my prop so that end is fine. I dont have a lathe, dont have room for one, and do not even have the skill to do basic lathe ops. So, I will cut the shaft into the front and back pieces and a machinist will add the keyway for the universal joint. All thats left after that is the deployable "device" strut whih is really just a single pivot at the front with a crank handle and a brake, and the tail end of course has the pivoting cutlass bearing holder which is just two ears and a through bolt. Its not rocket science but it will take some trial and error but I have some help as well.

I am most concerned to make the front pivot etc right than anything else.
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preventec47
Member
Username: preventec47

Post Number: 9
Registered: 08-2016
Posted on Saturday, August 27, 2016 - 07:10 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

What is/does deployable device mean ?
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kayak
Member
Username: kayak

Post Number: 21
Registered: 06-2016
Posted on Saturday, August 27, 2016 - 07:54 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Google "dispro" old retractable inboard propeller system from 100 years ago. there are great videos on vimeo (not youtube):

https://vimeo.com/dispro


and here is my build up thread:


http://www.oldmarineengine.com/cgi-bin/discus/show.cgi?1/271952
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ned_l
Advanced Member
Username: ned_l

Post Number: 44
Registered: 08-2012
Posted on Monday, August 29, 2016 - 01:14 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

For cutting the keyway,..... A perfectly acceptable job can be done with a 'Dremmel tool' if you take your time and lay it out well.

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