Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length.

[OneBladeMissing]

Has anyone run a Graupner 700 Race 9.6 volt (plain bearing) motor on 12 cells? Was the motor ok running on that voltage? Any problems?
Thanks.

[Andy]

Bit off an open question that one ! is the hull hydro or mono, is it for fun or racing ?

[Martin [Admin]]

I ran one in my Hydro a few years back - Excellent!

[OneBladeMissing]

The boat I intend to run it in is a hydro of my own design, just for fun.

[micknjen]

hi I'm running the 8.4 on a hydro 12cells an a octura 645 the motor gets barely warm

[Bridkid]

You shouldn't have any problems at all. I used to run a 9.6v on 14 cells in the old Formula One class (submerged drive system) many years ago and it just got warm, certainly not hot. I assume you will be water cooling the motor? You will get more speed from an 8.4v 700BB though, I used to use these for hydro racing with 12 cells some years ago but they were only set up to run for about 3 minutes!! Quite a blast......
Cheers,
Ian
 

[OneBladeMissing]

Bridkid, I also have a 8.4v 700BB, so I can try both motors out and see which is best.
What's that yellow boat in the pic?

[Bridkid]

Hi OBM!
It's a boat I scratch built from some photos I had of the original but I did change it rather a lot and also redesigned the hull running surface. You can see my build method here.
http://www.fastelectricsrfun.co.uk/miss_stress_2.htm

Cheers,
Ian
 

[Andy]

The 8.4bb is the better motor for speed,14 cells with a Graupner Carbon K45
isn't a problem.Make sure your speedo's up for it, good water cooling and motor/shaft alignment
12 cells with either motor will be fine.

[OneBladeMissing]

Bridkid, thanks for the link to your website. Interesting boat. I saw the full-sized boat race at Hull back in the nineties.

[Bridkid]

Yes, the original was in Bridlington for a round of the World Offshore Circuit Racing Championships during the nineties and that's when I took a load of photos, promising myself that I would build one at some point. Unfortunately due to bad weather in the bay I never got to see 'Jet' race. I was told at the time that she was a great boat, something entirely different, far more stable than a conventional hull and winning pretty much everything around.
Cheers,
Ian.
 

[OneBladeMissing]

The boat was designed by Lorne Campbell. He seems to have a thing about three-pointers. His designs have had many successes in 2-litre and 4-litre races. I "found" one boat that he'd designed at a boatyard next to the Thames once, in the late seventies. It was in a scruffy, sorry state. With a full-race V8 MerCruiser engine in the back covered with a tatty bit of carpet. A piece of kit like that discarded like an old boot!

[Bridkid]

Discarded it may well have been but I'd wager that if you tried to take it away there would soon be someone telling you not to!
Cheers,
Ian.