[ Show ]
Support VoyForums
[ Shrink ]
VoyForums Announcement: Programming and providing support for this service has been a labor of love since 1997. We are one of the few services online who values our users' privacy, and have never sold your information. We have even fought hard to defend your privacy in legal cases; however, we've done it with almost no financial support -- paying out of pocket to continue providing the service. Due to the issues imposed on us by advertisers, we also stopped hosting most ads on the forums many years ago. We hope you appreciate our efforts.

Show your support by donating any amount. (Note: We are still technically a for-profit company, so your contribution is not tax-deductible.) PayPal Acct: Feedback:

Donate to VoyForums (PayPal):

23/07/03 14:51:33Login ] [ Contact Forum Admin ] [ Main index ] [ Post a new message ] [ Search | Check update time | Archives: 123456[7]89 ]
Subject: T500 Folding Prop?

Ted Power
[ Next Thread | Previous Thread | Next Message | Previous Message ]
Date Posted: 4/02/04 12:40:17

I am in the process of fitting a new Beta 13.5 into "Swiftsure" in Kinsale. I thought I might go "the whole hog" and change to a 3 bladed folding prop-you only live once!

I have just realised that there is very little clearance between the back of the current two blader and the rudder ,when the rudder is turned 180 Deg for reverse! I am unlikely to be able to fit a folding prop for this reason?


Is it worth considering the folding prop at all. My engine supplier tells me it is woth 3/4 to 1 knot at crusing sped-this is attractive!

Has anyone fitted one successfully? Was it worth it?

Could I simply prevent the rudder from turning 180 with a mechanical stop system and retain the clearance? I would have to wrestle the tiller in reverse!

General question on Props.

On older boats with thick full length keels the shafts were marked so the the prop could be locked in paralled to and in line with keel. Thus minimising drag when sailing(With a two bladed prop).

I am continuously advised to lock my shaft when sailing so the prop does not spin.

My belief is that this only helps if you have the old long keel and the prop can be locked in the shadow of the keel.

I believe that if you allow the prop to spin, free wheel, while sailing that it will revolve, in reverse, at a speed dictated by the current sailing speed. The only energy loss will be the friction in the prop shaft. If you lock the shaft the prop will create much more drag!

I may be stoned to death for this theory! Anyone out there with the facts?

Regards to all,
Ted Power

[ Next Thread | Previous Thread | Next Message | Previous Message ]

Subject Author Date
Re: T500 Folding Prop?Brian Henry 5/02/04 7:58:22

Post a message:
This forum requires an account to post.
[ Create Account ]
[ Login ]
[ Contact Forum Admin ]

Forum timezone: GMT+1
VF Version: 3.00b, ConfDB:
Before posting please read our privacy policy.
VoyForums(tm) is a Free Service from Voyager Info-Systems.
Copyright © 1998-2019 Voyager Info-Systems. All Rights Reserved.