Hello Bob,
Your experiment is interesting and use of materials like delrin bushings etc. quite clever.
I am particularly interested on finding out how much of a performance improvement the 45 degree bend provides. If possible could you please angle the prop down until you get maybe 10% reduction in speed and tell us what that angle might be? I always wondered if sail drives made a significant improvement in boat speed due to pushing the water horizontally instead of angling it down.
Are you using a GPS to measure speed? Going backwards at 4kts ground speed against 7kts of tidal current must have been disappointing.
One of your pictures shows a unit with a two blade prop and straight drive shaft that eliminates the complications with the 45 degree bend in your latest design. How did that rig perform?
By the way hello everyone, I am a new member who recently joined the group. Hoping to get some good ideas on how to go about designing a hybrid electric drive for my hunter 54 sailboat.
Fair winds.
Your experiment is interesting and use of materials like delrin bushings etc. quite clever.
I am particularly interested on finding out how much of a performance improvement the 45 degree bend provides. If possible could you please angle the prop down until you get maybe 10% reduction in speed and tell us what that angle might be? I always wondered if sail drives made a significant improvement in boat speed due to pushing the water horizontally instead of angling it down.
Are you using a GPS to measure speed? Going backwards at 4kts ground speed against 7kts of tidal current must have been disappointing.
One of your pictures shows a unit with a two blade prop and straight drive shaft that eliminates the complications with the 45 degree bend in your latest design. How did that rig perform?
By the way hello everyone, I am a new member who recently joined the group. Hoping to get some good ideas on how to go about designing a hybrid electric drive for my hunter 54 sailboat.
Fair winds.
Ahmet Erkan
From: "Bob Moriarty moriartybob@yahoo.com [electricboats]" <electricboats@yahoogroups.com>
To: "Bob Moriarty moriartybob@yahoo.com [electricboats]" <electricboats@yahoogroups.com>
Sent: Tuesday, July 11, 2017 9:15 PM
Subject: Re: [Electric Boats] Electric Drill Powered Dinghy Propulsion [1 Attachment]
[Attachment(s) from Bob Moriarty included below]
Working well. Hit 3 knots - estimated. Not in this pic.
Ox 1976 C&C 33
LOA: 32.87' / 10.02m
LWL: 26.42' / 8.05m
Displacement: 9800 lbs./ 4445 kgs.
Propulsion System: Electroprop Racer
Batteries: 4 X Northstar 210 FT Blue+
LOA: 32.87' / 10.02m
LWL: 26.42' / 8.05m
Displacement: 9800 lbs./ 4445 kgs.
Propulsion System: Electroprop Racer
Batteries: 4 X Northstar 210 FT Blue+
Prop: 4-blade fixed 13 X 15.5 w/0.090 cup (IIRC)
Jax, FL USA
Jax, FL USA
On Tuesday, June 27, 2017, 8:42:46 PM EDT, Bob Moriarty moriartybob@yahoo.com [electricboats] <electricboats@yahoogroups.com> wrote:
Lots of youtubes about this topic...
I'm looking to propel my ~100 lb (~45 kg) dinghy to a dock from a moored boat - and back.
Current is tidal and can reach 7 knots.
Bought a cordless drill (always wanted a cordless drill):
The prop is from this fan:
Added a 3' X 5/16" stainless threaded rod, 6" stainless carriage bolt, 1" PVC pipe, 1" delrin bushings, a 45 degree PVC coupling, and some bendy, steel mesh reinforced rubber tubing for attaching the rod to the carriage bolt inside the 45 degree coupling.
Initial sea trails went better than expected - reached ~3 knots in calm conditions.
The fan/prop is a bit bendy so I've given it a coat of epoxy. Will see tomorrow after the epoxy completely hardens.
Not sure if folks on this list are interested in this type of electric propulsion.
Ox 1976 C&C 33
LOA: 32.87' / 10.02m
LWL: 26.42' / 8.05m
Displacement: 9800 lbs./ 4445 kgs.
Propulsion System: Electroprop Racer
Batteries: 4 X Northstar 210 FT Blue+
LOA: 32.87' / 10.02m
LWL: 26.42' / 8.05m
Displacement: 9800 lbs./ 4445 kgs.
Propulsion System: Electroprop Racer
Batteries: 4 X Northstar 210 FT Blue+
Current Prop: 4-blade fixed
Jax, FL USA
Jax, FL USA
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