Graupner Mini Hydro

[j.m.]

Don't know about the 2.26mm shaft...

Use this motor:

http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=6316&Product_Name=Turnigy_E500_6T_4000Kv_200W_Heli_Motor

It's got a 1/8" shaft.

Or this if you are looking for a top-of-the-line motor for a small hydro:

http://www.gobrushless.com/shop/index.php?app=ccp0&ns=prodshow&ref=SCHK2221-10V2

http://www.gobrushless.com/shop/index.php?app=ccp0&ns=prodshow&ref=SCHK2221-8V2

Both of those motors are rated at or above 440 watts of power.

They will push these little hydro's along at INCREDIBLE speeds.
Those motors are kinda like the Neu's of inrunners.

Not the best, but they sure are good.

[stablgr]

Good question. Does anyone know where I could get a coupling for this motor?

[n.h.schmidt]

Couplers

I make and sell custom motor couplers. 2.26mm works out to .089 dia. I can make couplers for that size. What size prop shaft? Typicaly for a simple one like this the cost would be $6 plus shipping of $1. With two couplers ordered ,no shipping charge.
n.h.schmidt

[Avanti]

Ok I have seen these motors on ebay and do these speed controls that they come with work properly with a pistol grip radio? and one more question where do you get a coupling for a 2.26 mm shaft? I have found the 3mm shafts but no luck on the 2.26mm shafts (maybe I am not looking in the right places) and how do we know if the speed controllers are or are not compatable with P.G. Radios before we get them or is it just a crap shoot? just wondering since the pistix are no longer available and not being produced any more, that is a bumber those things work great so start making them again RC Hydros!!!!

the mystery 30a work fine with my JR pistol model XS3

[peells]

N.H. Schmidt, That is great information to know,
John thank you! I have a 2.4 Ghz fasst Futaba and I have used Hex tronic's esc and they would start running with the trigger in the off position and go really fast in reverse and stop in full throttle so I bought a pistix and cured that prob. and thanks for all the information.

[stablgr]

I make and sell custom motor couplers. 2.26mm works out to .089 dia. I can make couplers for that size. What size prop shaft? Typicaly for a simple one like this the cost would be $6 plus shipping of $1. With two couplers ordered ,no shipping charge.
n.h.schmidt

Thanks, I'll certainly keep that in mind. I haven't sorted out what I'm going to use for the prop shaft. I can't work out the pros and cons between a piano wire type drive or one of the flex cable thingymajigs.

[Chop]

O.K., I worked on the boat tonight. I’ve been putting it off because I have too many irons in the fire.

I have the new 3000kv motor installed, put the stuffing tube back in, and have the electronics assembled. The ESC is slightly larger than the stock one, but there was enough room.

I’m waiting for the glue to dry. I will take pictures tomorrow, and might even get it wet at lunch time.

[Chop]

Well, the mini hydro runs good with the new parts (3000kv outrunner & 30a ESC). Tough getting the wires routed so that they don't touch the outrunner's can.

The prop got scuffed up somehow (Did my son run it up on some rocks?). On the straight-a-way it runs good, but in the turns it dies in cavitation. After a few moments the prop grabs and it takes off.

It looks like a very small, threaded propshaft (3mm?). I'm guessing that the prop should be played with.

No, it is not going to just be a SAW boat.

[Dr. Jet]

It's probably a Graupner threaded prop (4 mm threads). Try a K29 prop from OSE.

[Chop]

Damn, I just received an order today.

[peells]

Try putting a turn fin on the back of the sponson which is on the inside of your turns, I had the exact problem with my mono and I suspect the same thing is happining here, it was like adding power steering and I then could use full power in the turns. Good luck, (I vote your kid hit some rocks)

[Chop]

Sorry, I forgot to mention that I also installed a turn fin.

My bet is on the (slightly, chewed up) prop.

[peells]

I hate it when that happens!!! How about battery position? strut depth? strut angle? a jet engine LOL

[n.h.schmidt]

Prop

Hi
If you are using the original prop that came with the boat,it is a 26mm prop with a 2mm threaded hub. Offshore has new replacement props.I don't know if your prop shaft is also 2mm all the way or stepped down. Offshore used to have 2mm to 4mm adapters for the zig zag boats. That would allow the use of the other Graupner props starting with the K 29 and going up from there. I can make the adapter if Offshore doesen't carry them anymore. n.h.schmidt