Re: [Electric Boats] Props for EP

 

In the spirit of contributing, here's my first post.

I've been watching & learning from this site for a couple of years, I really appreciate the info & the spirit in which is given.

I've done some tow tests on my 30' fibreglass displacement boat. It's fitted with a Ford Lehman, 57 HP. The maker originally fitted 36 HP Volvo. I think a 17 HP diesel would have been OK.

HULL

Waterline length 8m (26.25')

Beam at waterline  2.5 m (8.2') 

Weight, with 70% water & fuel 5 tons (11,023!lbs) 

Wetted surface area 24.5 square metres (273.7 sq.ft.)

HULL DRAG (Ave of two runs, opposite directions)

Knots  km/hr   m/sec      Kgs    Newtons    Watts

2         3.7       1.0288     14      137.4        141.36811

3         5.5       1.5433     24.5   240.35      370.93696

4         7.4       2.0577     38      372.8        767.13292

5         9.3       2.5722     68.5   672           1728.5318

6        11.1      3.0866     104    1020.25    3149.1444

GENERAL DATA 

 

Speed Length Ratio 1.323

Pounds/HP (existing engine) 193.4

Hull Speed 12.7  km/hr (6.86 knots)

Hull Speed 3.53 metres/sec 

Power in watts at 6 knots  3601.5 watts

Peter Robinson

'WaveLength' 30' Cuddles Cruiser

Mallacoota, Vic, 

Australia

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Posted by: peter@mallacoota.com

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