Electric 1/8 scale hydro ? - RC Groups
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Aug 25, 2005, 10:14 AM
Registered User

Electric 1/8 scale hydro ?

I have been thinking about powering my 1/8 scale hydro with electric power. the boat is about 3 foot long and empty weight is about 6 pounds. What would be a good motor and battery setup.
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Aug 25, 2005, 11:06 AM
Useful Idiot
Electric 1/8 unlimiteds are a rare breed, although there is some interest. Have a look at
Aug 27, 2005, 11:44 PM
RC boat Rock Star
Dennis Whitt and Paul Pachmeyer have both built some very fast 1/8th scale hydros. Paul took his to the IMPBA Internat's, raced against the nitro boats and did very well against them.
Aug 30, 2005, 11:35 AM
Registered User
I wounder what would be a cheap"plane jane" electric brushed motor to get my 1/8 Miss US up on a plain thinking 20 cell sub C.
Aug 30, 2005, 01:49 PM
Useful Idiot
The De Walt electric tool motors have a good reputation among the heavyweights. Some of the battlebot sites also have suggestions.
Aug 30, 2005, 04:04 PM
Maker of Sawdust
forresterace's Avatar

There are probably in the neighborhood of 8-10 electric 1/8 scale hydros running in North America right now and there are more currently under construction. None of them are using brushed motors any more to my knowledge, cheap or expensive. Although a couple of builders started out trying fewer cells, everyone is now up to 30-32 cell packs. At least one boat ( the one which won the class at the Michigan Cup race this year) is using a 10S 2P lipo pack. As far as I am aware, all boats this year are now using the Lehner 2280 Bl motor (11 or 12 turn wind).

I'm afraid your desire for a cheap, "plain Jane" brushed motor being successful on 20 cells is a bit of a "pipe dream". Oh yeah, the Lehner 2280 motor sells for about $500 and a suitably-sized speed control will cost about the same.

Sorry for the touch of reality. They are doing 55-60 mph, however.
Sep 01, 2005, 07:22 AM
Registered User
K.R.Joye's Avatar
There are cheaper solutions to powering a 1/8th Scale if you if you don't plan on entering competition. Dougs correct todays FE 1/8th are running in the the 50-60 mph range.

The`MACH 5 racing' 800GRX-L motor will power a lightweight 1/8th or large Offshore Racing boat into the 30 MPH range at a fraction of the cost. They feature watercooled replaceable brushes and are 1/2 the weight of the monster plastic endbell Dewalt. The 800GRX-L sports a steel can with alloy ball bearing endbell, same mounting as todays popular 700 Series motors but put out a lot more power. (see my web store below)

The Lehner 2280 isn't the only motor in town either. The big Plettenberg BL 370/50/A1s is now looking like it may be the motor off choice for FE 1/8th scale. I'm aware of 4 racers using them now including myself. The motor is lighter, less expensive and easier to package than the Lehner with a slight power advantage.

I have the Plett 370/50/A1s BL motor in my 1/8 Dumas Miller American running on 32 cells and run a Plett 355/40/4 brushed motor on 28 cells in my 1/8 Valasko Squire Shop. Both are 50-60 MPH boats in race trim.

~~~~~~~~`Mach 5 racing'~~~~~~~~
Competition Proven Motors & Hardware
~~~~~50+MPH Club Member!~~~~

Last edited by K.R.Joye; Sep 01, 2005 at 07:28 AM.
Sep 03, 2005, 01:20 PM
Registered User
Thanks for the information on the 800 GRXL motor, sounds like a worth while investment.

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