hansvonpensch

My questian is, will the Graupner 720 Tourqe turn a Rabosh 4 blade 3" dia, 3" pitch blade efficently. Thanks, Randy.

subsinker

My Feedback: (61)

SPEED 720 BB Torque6-12 V Graupner 6372 Twin ballraced, 8-pole armature.

Special high-performance motors with integral
suppressors. Characteristic high torque at low rotational speeds, therefore ideal for use in direct-drive model boat power systems with large
propellers.


Nominal voltage 12 V
Operating voltage range 6 ... 13 V
No-load rpm 4100 min–1
No-load current drain 0,75 A
Current drain at max. efficiency 3 A
Current drain when stalled 13,5 A
Max. efficiency without gearbox 75 %
Length of case, excl. shaft 72 mm
Diameter 44,5 mm
Free shaft length 6,5 mm
Shaft diameter 5 mm
Weight 380 g

Looks like it will to me based upon the specs

Pete

hansvonpensch

In about 3 weeks I will let you know, how it turns out, thanks, Randy.

hansvonpensch

Ran it today for about 5 minutes, constant, and the motor was cold. The tug boat is about 20 pounds and has a displacement hull and was plowing the water. On full speed it started to look as if it would plow the front end under, a 36" Shelly Foss with a 12" beam. The motor preformed great.

rye

My Feedback: (10)

hi
i am using these motors for my 1/16 scale landing craft could you tell me what size the bolt holes are thanks rye
http://www.rcgroups.com/forums/showthread.php?t=912756

hansvonpensch

I remember going to Home Depot with a Grapner 700 in my hand and had to trial fit some screws off the shelf, I am 99.5% sure I use the extra screws that worked on the 700s.

Stavros Mayhem

you will have not problems with that set up at all I run the same motor in a Tid Tug at 40ins and that weighs in excess of 40lb runs all day without even breaking into a sweat


Stav