Propulsion system for small boats : The BOB Drive

About inboard or outboard motors.

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Mr Hot Rod
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Propulsion system for small boats : The BOB Drive

Postby Mr Hot Rod » Sun Nov 15, 2009 10:28 pm

SOMEBODY has to build this ...

The BOB Drive (Building a liftable propulsion system for small fishing craft, from the FAO)
http://www.fao.org/DOCREP/FIELD/006/AD5 ... M#Contents

bob_drive.jpg

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Paul Kane Chelsea, PQ

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Nova SS
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Re: Propulsion system for small boats : The BOB Drive

Postby Nova SS » Mon Nov 16, 2009 6:06 am

Paul, is that sort of like a disappearing prop?

http://www.dis-pro.com/

jcallends
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Re: Propulsion system for small boats : The BOB Drive

Postby jcallends » Mon Nov 16, 2009 6:42 am

I've seen a lot of this type system in SW Florida. Used on Beck boats with tiller steering for fishing around the gulf in back waters and estuaries. Commonly use Brigg & Stratton air cooled engines of 8-15 HP. Not suitable for deep water.

upspirate

Re: Propulsion system for small boats : The BOB Drive

Postby upspirate » Mon Nov 16, 2009 9:57 am

Somebody has....Falcon.

It was his Sweet Caroline build that the system was patterned after

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Mr Hot Rod
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Re: Propulsion system for small boats : The BOB Drive

Postby Mr Hot Rod » Mon Nov 16, 2009 1:15 pm

The "Harvey" FNR is a Forward, Neutral and Reverse Transmission for a Small Motor.

To paraphrase GlenL's literature :
The FNR (Forward, Neutral and Reverse) Glen-L plans are based on a system fabricated by Porter Harvey for his Glen-L design Sweet Caroline. The "Harvey" FNR uses a unique system of chains, sheaves and friction wheels to provide forward, neutral and reverse without a clutch. Shifting from neutral to forward or reverse is accomplished by merely moving a lever back and forth. It's a proven simple system adaptable for use as a standard in-line inboard or for a vee drive installation by adding a jack shaft.


Image

Complete Drawings of both an In Line (motor ahead of the shaft log) or Vee Drive (motor aft of the shaft log), full size pattern of the Shifting Lever and component parts, instructions, Bill of Materials, and component sources are available here :

http://www.boatdesigns.com/products.asp?dept=914

The "BOB Drive" is a liftable propulsion system for small fishing craft. No provisions for FNR.

bob_drive_2.jpg

The drive system was developed by O. Gulbrandsen, Consultant Naval Architect and M. R. Andersen, Small Craft Specialist (APO, BOBP), Food and Agriculture Organization of the United Nations, Bay Of Bengal Program, Madras, India, 1993.

I know Bruce has been chomping at the bit to start his Electric Launch, so I thought that I'd throw a new level of complexity into his project !
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Paul Kane Chelsea, PQ

Building the Glen-L Hot Rod : http://www.boats.chelseacoachworks.com

upspirate

Re: Propulsion system for small boats : The BOB Drive

Postby upspirate » Mon Nov 16, 2009 3:32 pm

Oops! Sorry I looked briefly at your first post,and thought it was Falcons drive!! :oops: :roll:

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Mr Hot Rod
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Re: Propulsion system for small boats : The BOB Drive

Postby Mr Hot Rod » Mon Nov 16, 2009 4:54 pm

I don't spend too much time in Electric Power, but I noticed rdhastings and Bruce Dow have previously posted about lift up props :


Amazing how much info is out there !
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slug
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Re: Propulsion system for small boats : The BOB Drive

Postby slug » Mon Nov 16, 2009 4:55 pm

Think the "Dispro" has been around a lot longer than 1993!!!
Doug

Nova SS
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Re: Propulsion system for small boats : The BOB Drive

Postby Nova SS » Mon Nov 16, 2009 4:57 pm

slug wrote:Think the "Dispro" has been around a lot longer than 1993!!!
Doug


this is from the dispro site;

Invented and built in Port Carling, Ontario from 1914-1926, the Disappearing Propeller Boat went on to become world famous. Now, expensive collectors' items, the boats are quite rare, yet occasionally can still be seen on Canada's Muskoka Lakes.


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