headhunter23

Dragon that's close to what im looking for... dunno how I missed it. Anyways the version that I was looking for is completely flush with hull, that one seems to stick out a bit, I know I'll hit it and break it or it'll screw up the river running a bit.

I went back through history... know it's on here somewhere but unable to find it.

damfurst

[link]http://206.206.85.209/xtdoc/Details.aspx?ProductCode=m-1790&store=mhzusa[/link] Try that link Headhunter. I bought one when I purchased my Gecko, but I have not yet used it. I think it's what you are talking about.

areseaer

KMB has the sameones as MHZUSA and even with two.[link]http://www.jet-drive.de/cms/component/page,shop.product_details/flypage,shop.flypage/product_id,255/category_id,26/manufacturer_id,0/option,com_virtuemart/Itemid,17/[/link]
They have 2mm and 3mm barb sizes of the single and double pickups.

headhunter23

Thanks guys, that's what I was looking for.

jetboard

I was wondering if anybody has experience with the Graupner 2347 unit which has a 49mm impellor! I see they're sold by Cornwall model boats in England. Has anybody seen them sold in the states? Any idea what size motor you would need to get that thing to full power? Glad to see people are playing around with the 40 sizes.

DRAGONFIRE81M

heres the only guy that i know that has done an eletric . there also some guys running that drive in the 1/4scale gas jet sprint thread on the gas side

http://www.rcuniverse.com/forum/m_65...79/key_/tm.htm

http://www.rcuniverse.com/forum/m_8503394/tm.htm

Vinnystoolbox

Headhunter i have a kb45-o8l it runs beautifully cool and smooth, not sure what amps it pulls as i don't have a watt meter.

I'm running a 29m graupner drive with standard impeller on 14.4v


It did run ice cold until i fixed my water cooling and added water cooling to the esc, oh well can't hurt to have a little warming for the motor

headhunter23

Vinny ya got a video?

dragon after looking back... did smokerate ever post how the boat went? videos etc?

DRAGONFIRE81M

no he hasnt . well guy hate to say it but im an ideate . got my 5s in . and went to test the weght of both paks in the hull after that i hocked them up to the esc . but used the wrong y connecter . 36v isnt a good idea even for a sec . know all the esc will to is pluse the motor . it is so bad that when you disconet the esc from every thing but the battery . the deans plug pluses like the motor did . [&o] but i have a nother 100a coming .

sundogz

Vinnie, where did you find a 6mm connector for that KB45? I've been searching around for a 6mm to 5mm with little luck.

Headhunter: Yup, it came (from a private party) broken. The box had no packing, but didn't appear damaged - Arrrrgh. But, no biggie - superglue will take care of it.

Danfurst: did you get pics of that Jet Ski mod yet? Looking forward to seeing them. I'll bet it sucks (ha!) better opened up like that - I know mine did better afterwards.

Dragon: I feel safe in saying that we've all been members of that club (for one reason or another) - so welcome! What esc did you fry??

I've decided to (Dragon might like this) dismantle this other (brand new) ABC Jet Ski and use the powertrain in the 21" river runner (BBY Oval Offshore). Should be plenty of poop. Anyone need a mechanical 2 speed w/ reverse (25a fuse ) speed control? I've got two I can spare now.

DRAGONFIRE81M

yeah it was the simple 100a from hobby city . its only rated for 8s make . but i had 10s for like a sec . till i notice i was useing the wrong Y connecter .

i thank the abc jet will be more suted in the 21" bby hull . cant wait to see it tack plenty pics of the build

Vinnystoolbox

Whoops, 10s would have been interesting to see running.

There is a very short video a couple of pages back or here www.youtube.com/watch?v=6E_6EdRnmZM battery is getting flat and cameramans first outing with that camera. May try to get a better video tomorrow.

The connector is a modified '3345 Graupner Flexshaft Coupling Assembly (5/4mm)' from cornwall models but i just checked their website to find a 6mm to 4mm version '3343 Graupner Flexshaft Coupling Assembly (6/4mm)'.

Don't know if that helps you but that's how i did it.

sundogz

The reviews (Hobby City) for that controller say it is only reliable with 7s. The first review says he fried it on 8s! And another says a different store rates it as 7s. You might want to look around some more.... Sdg

DRAGONFIRE81M

my motor is rated for 5s . i have ran it on 3s and 4s and was going to run it on 5s but got 10s before i could try it . other then that its a great esc it stays cool when running .

sundogz

Dragon check this out - there are two versions of that esc. A high voltage and a low voltage version. Look here: [link]http://www.suppomodel.com/ESC/escmenu.html[/link]

Thanks Vinnie I saw that one, and while looking around some more happened to find this goldmine:

GOOD MOTOR CONNECTOR SOURCE! Youse might oughta save this to 'favorites'. It'll be difficult to find it later looking back through the thread. [link]https://sdp-si.com/eStore/Direct.asp?GroupID=659[/link]

DRAGONFIRE81M

good find . i saved both sites. its great that they sell a hv but i really dont need it 18.5v at 2600kv = 48100rpm should be insanly fast . since big blues fastes run was 49950 rpm . im sure vinny could use it since his kb45 can handle that voltage.

Vinnystoolbox

My esc says it can run 25v max which would be 57500rpm if i wanted it.

Happy with her as she is though, this is my first FE boat and water around here isn't that large that i need anymore speed.

I'd probably melt the drive anyway seeing as they aren't exactly the highest quality materials.


But then again 36v should be around 82800rpm, might be amusing for a few seconds

Vinnystoolbox

Just thought i'd give you guys the new video.

http://www.youtube.com/watch?v=SxEx3dWlaSE

Recorded today, was quite windy i think that was causing some issues seemed a little jumpy.

Perhaps i'll get a gps reading next trip. Seems to get slower each use i guess that's me getting more used to using her.

DRAGONFIRE81M

looks alot better to me . nice video. im working on makeing some fiberglass 29mm intacke ducks . picked up some vac bags to see if it will work

blizzzarddemon

im new to rc boats but rc cars i have a lot of experience with and im looking at getting a traxxas blast and installing the graupner mini jet drive into it any words of wsidom will help how do these steer will it even work in a traxxas blast with out doing major major work basically if i can cut the bottom of the hull and it work wold be nice but what abotu the actuall drive im worried about i might be willing to pay for detailed step by step instructions with pictures on how to go from stock blast to a jet populsion blast

DRAGONFIRE81M

welcome . i thank jm on here was plaining a blast converson . pretty much with the mini jet drive youll need a 90 deg trannsom to make it an easy drop in mod . but if the hull isant at 90 deg it can still be done youll just need to noch the transom around the outlet to make it fold in to make that area wright . i have some pic on that mod . this drives steer by a nozzle on the outlet to deraict the flow to side to side . how where you plaining on powering brushed -brushless , lipo- nicd . and a bugget on a setup

blizzzarddemon

oh well idk i have a bunch of lipos for my rc cars liek 4 or 5 actually what hull would work best that is cheap and idk brushless is expensive i was thinking maybe the traxxas vxl set up since i have 2 or running a waterproof xl5 with a titat 12 turn motor i would liek to basicaly cut a hull in the hull and have it work but how would i do the rear and what is a cheap hull that is flat and small enough i dont have a lot of money to spend in rc boating since i can only use the boat in the summer cause at college only water big enough is the college pool ( i dont think they liek rc boats in there) and the Hudson river so to invest tons of money in an rc boat not worth it but i love the idea of jet powered because they dont need deep water and in jersey sometime the lakes and amall rivers get quit low and rocky

DRAGONFIRE81M

you can get a cheap brushless setup from hobbyking . i would just get a nqd jet sprint off of ebay . and get the setup i just posted . and all you need in a 3s lipo or nicd pack and a radio setup and one hiteh 55 servo

motor $14.95 http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=4704&Product_Name=KB20-40-15L_3800kv_Brushless_Motor_(FIN)

esc $9.25 http://www.hobbycity.com/hobbycity/s...Simple_30A_ESC

plus shipping around $7

http://cgi.ebay.com/New-Remote-Contr...3A2%7C294%3A50

blizzzarddemon

i coudl not find that boat on ebay or online

DRAGONFIRE81M

if you do go with a jet sprint here is a thread just on it but there is a lot of info in here youll just have to rub your eyes and ceck back and read it from the beganing

http://www.rcuniverse.com/forum/m_79...tm.htm#7991409