HOBBY KING Jet pump

[sundog]

Integrated water cooling

Punisher, thanks for your review of the HK drive - very informative. Your mounting 'cage' being in direct contact with the water (through the intake grill) should transfer a bit of the motor heat away as well (water cooled mount). I am anxious to see it installed and running in something! I'm a fan of the jet sprint hull - great handling boat design and much fun in the rapids, too. Bravo!

[FighterCat57]

I wonder if two of these would do OK in a 60" MTI Cat, since there's so much sponson space?

Would have to machine the pickup to match the sponson bottom, but would be a very cool twin jet.

[Punisher 67]

Don't hold your breath guys this will be a slow build up I have still yet to decide on a hull .

[sundog]

I wonder if two of these would do OK in a 60" MTI Cat, since there's so much sponson space?

Would have to machine the pickup to match the sponson bottom, but would be a very cool twin jet.

I can't say, as I've never seen it done before (heard a lot of opinions, though). I have seen a couple of mini monos with stepped hulls that did fine, as well as a mini no-step cat that also did well. I have to admit to having reservations about using jet drives on stepped hulls. I've always thought aeration might cause priming and cavitation problems at higher speeds. But maybe not, still waiting for someone to try it!

[Old Sloppy]

@ Fighter Cat 57


I think two of HK jetpumps are overkill in a MTI, think of "Jet-SAW" racing............
I have two Pletts in a 60" SuperCat (similar to MTI) and that is way overkill...2 3080's = 4 Pletts........

Harry

[ray schrauwen]

@ Fighter Cat 57


I think two of HK jetpumps are overkill in a MTI, think of "Jet-SAW" racing............
I have two Pletts in a 60" SuperCat (similar to MTI) and that is way overkill...2 3080's = 4 Pletts........

Harry

What KV are you turning on those Pletts?

[Old Sloppy]

the HP370BM50 A1s is 813 kv

[ray schrauwen]

Thank you. I'm going to use a pair of 880kv T600 outrunners in my 41" on 9S.

[mgriggster]

Punisher, did you make extra shafts for this? I am one of the unfortunate people who bought one of these pumps too and see what you mean about the shaft. I would love to purchase one if you had extras made. I bought a jet sprint boat from Davette boats and he is assembling it for me. I sent him the pump and he pointed out the issue with the shaft. He said it was undersized and the bearings didnt even spin so your just running metal to metal. Let me know if you had extras made as I would love to have one.

[Punisher 67]

Hello mgriggster

I tried to machine one out of stainless steel and did not a bad job but ended up sleeving the bearing part with some brass tubing cause I overshot a bit on the diameter - its a good fit on the bearings but maybe a bit of blue locktight would ensure no slippage , the second one I machined was out of aluminum and that one fits great but I question its strength on the long haul . I will eventually machine another out of stainless steal but have to buy some special carbide indexable bits and I don't know when that will be . You can have the first one I made its certainly better than the one you have .

P/M me your addy and paypal me $7.50 for postage if you want this shaft .


It really pi$$es me off that the pump itself was beautifuly machined and then they farmed the shaft out to some backyard fumblef*ck operation and to boot put a cheep bushing at the front in the stator housing , this can be a great pump if they didn't cut those corners . I ended up machining in a bearing boss for my stator and replacing the bushing with a ceramic bearing - that upgrade makes this roll so smoothly . I can do that for you also if you mail me your front housing .

[Old Sloppy]

Ray Schrauwen,
Do out-runners like 29,200 rpm's ?
If no then try 8s for 25,950 rpm's
or 7s for 22,700 rpm's
this is based on 3.70 volt lipo's
Harry

[Heterodox]

Just bought this pump and a Scorpion 7050/340 to happily mate for an experimental commercial project.

I was planning on running through the pieces and making the aforementioned improvements, but I've got other projects that are pressing me for time and my machining skills / available tools are lackluster.

I'm wondering if you might take my entire pump and bestow the same love upon it? It should arrive from HobbyKong next week and I need it tweaked before the end of the month. PM?

[100 mph jet boat]

Any updates

I just found this thread and im into real jet boats and would love to see this build

[Punisher 67]

This will be a winter project for me I just do not have the time right now to finish this - I am working 12 hour days sometimes 14 days straight - work right now is stupid busy

[100 mph jet boat]

at least your working... {:<)

will be looking for some updates this winter {_o__@__o_}

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