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Gas Jet Boaters

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Old 07-12-2012, 03:27 AM
  #426
Dana W
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Default RE: Gas Jet Boaters

The DaVette Sprint hull is 34" long . You can PM me on how to purchase a hull .

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Old 07-12-2012, 03:30 AM
  #427
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Default RE: Gas Jet Boaters

My mistake, the Swashdrive must be 32".
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Old 07-13-2012, 08:14 AM
  #428
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Default RE: Gas Jet Boaters

I see anything bigger??Or is that As big as they come?I saw this link on youtube looks bad ass bigger than 34" i think.You be the judge.

www.youtube.com/watch
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Old 07-13-2012, 03:09 PM
  #429
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Default RE: Gas Jet Boaters

thats a cool clip.

My hulls are 40" but i have been having a hard time getting them made. ive been pushing to have one for the last few months now. sounds like i may have one ready monday or tuesday (really hoping).
heres a link to my build. they dont come with the wing on the back like mine is pictured with.
http://modeljetboat.com/forum/index.php?topic=54.0





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Old 07-13-2012, 03:19 PM
  #430
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Default RE: Gas Jet Boaters

So if i do end up getting a hull (or two) this week i will be looking at builing me another one up very soon.
What do you guys recommend for an engine. I went from a weedeater (years ago) to a stock Zenoah 260 to the stock RCMK S254 seen above. the two options im thinking of at the moment are a RCMK K30 or the Zenoah 290 for the extra midrange torque, which would be the better motor to go for?

cheers
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Old 07-15-2012, 04:48 PM
  #431
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Default RE: Gas Jet Boaters

hey steve i would go with the k30 ive sold a few to replace zens all the guys cant believe the difference

pm me i have them in stock can do you a deal on one ..
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Old 08-25-2012, 07:19 PM
  #432
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Default RE: Gas Jet Boaters

Tried this in the main Gas Boat Forum but no response, so I will try it here.

I have an idea that I have drawn up with Solidworks and would like you guys opinion.

I have a plan for a 50cc Twin driving 2 Jet Pumps piped into 1 outlet and nozzle.

Do any of you have any ideas about what I have planned or do you see problems with my design?
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Old 08-26-2012, 06:22 PM
  #433
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Default RE: Gas Jet Boaters

Going from a singe engine, through a gearbox to twin pumps and back to a single outlet has four main issues I can see.

1 - loss of energy through gearbox and twin pumps
2 - flow problems where 2 pumps join into one nozzle (complicated stator required)
3 - you want the uptake as far back on the hull as possible, so you will have lots hanging out the rear
4 - when the hull leans over in turns you will likely suck air in one of the uptakes & cavitate/airate the system

Cheers
Jason
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Old 08-27-2012, 06:48 AM
  #434
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Thank you for your response. Those are the things I was looking at but I don't have alot of experience with a squirt boat.
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Old 08-27-2012, 04:39 PM
  #435
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Default RE: Gas Jet Boaters

With jets you want torque more than rpm from your power source. I'd stick with a single engine to a single pump. When you design your impeller make sure the blades overlap so you get the best prime possible. The Jettec pump (re named swashdrive) is the only model jetpump currently on the market with overlapping blades. Not one of the Graupner, MH$ and Hobbyking pumps have overlapping blades and all, from my experience, suffer badly with cavitation and pump priming.
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Old 10-08-2012, 01:07 AM
  #436
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Default RE: Gas Jet Boaters

Hi All,
Picked up a couple of new huls on Saterday, Started on one, will keep the other for a while before I start on it.
My latest boat, will be powered with a RCMK K30S, Jettec jet unit. Got the paint and carry handle/roll cage done. Should be finished in a couple of weeks.

Cheers
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Old 10-08-2012, 11:12 AM
  #437
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Default RE: Gas Jet Boaters

slowly getting mine new one put together, just need a roll cage made up and paint scheme now

cheers
steve
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Old 10-10-2012, 04:01 PM
  #438
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Default RE: Gas Jet Boaters

well got my sprint boat wet last night.
running 1/2 to 3/4 throttle most of the time though. I need to make my roll cage to add weight forward a bit and a spoiler to reduce swamping it when it spins out.
i am reasonably happy with it so far,nothing a bit of tweeking and tuning wont fix

heres a couple of vids
http://www.youtube.com/watch?v=2XaGhs2uorc&feature=plcp

http://www.youtube.com/watch?v=m0EcWdukZLo&feature=plcp

cheers
steve
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Old 10-10-2012, 04:52 PM
  #439
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WOW pretty nice Steve . Good job .

Dana
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Old 10-10-2012, 05:44 PM
  #440
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Default RE: Gas Jet Boaters

Steve,
looks great on the water, a bit tail heavy, may be able to move the fuel bladder foward.

Cheers
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Old 10-11-2012, 04:20 AM
  #441
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Default RE: Gas Jet Boaters

Just about to get a new design in the water.
Should be around a week away from testing







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Old 10-11-2012, 02:03 PM
  #442
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Quote:
ORIGINAL: kamipalms

Just about to get a new design in the water.
Should be around a week away from testing


[img][/img]

[img][/img]

[img][/img]
kamipalms,
looking good, can't wait to see it go.
Cheers
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Old 10-14-2012, 09:33 PM
  #443
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Default RE: Gas Jet Boaters

Hi All,
Another one complete ready to get wet. Had problems with the 929 carby fitted standard, took it off chucked it in the ocean and fitted a 257 and it now runs great like it should.

Cheers
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Old 10-15-2012, 08:39 AM
  #444
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Default RE: Gas Jet Boaters

looks wicked mate is it the davette sprint ,how did you the gasket between hull and pump thanks
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Old 10-15-2012, 10:55 AM
  #445
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Default RE: Gas Jet Boaters

it is a swashdrive jet sprint hull.
the gasket is made with a piece of rubber bike tube. it has a smaller hole cut in the middle to create a compression fit around the jet unit and the a flange fits over and bolts to the transom.
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Old 10-15-2012, 01:05 PM
  #446
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Quote:
ORIGINAL: phillio35

looks wicked mate is it the davette sprint ,how did you the gasket between hull and pump thanks
No it's not a Davette, it is made by a bloke out here, the seal is from a truck inertube, thicker than a bike tube. Will take photos of the next one that is on the go now.
Cheers
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Old 10-15-2012, 06:04 PM
  #447
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Default RE: Gas Jet Boaters

quick update







Almost done
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Old 10-15-2012, 09:44 PM
  #448
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Default RE: Gas Jet Boaters

Kamipalms,
Its looking good, can't wait to see it run.

Cheers
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Old 10-16-2012, 01:16 AM
  #449
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Quote:
ORIGINAL: The Ghost

Kamipalms,
Its looking good, can't wait to see it run.

Cheers
Thanks Mate

Finished and ready to build





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Old 10-17-2012, 10:35 AM
  #450
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Default RE: Gas Jet Boaters

looks like mine phil
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