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Gas Jet Boaters

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Old 05-25-2010, 06:21 AM
  #301
Dana W
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Default RE: Gas Jet Boaters

The KMB works fine I just think the 40mm impeller is alittle small for a Zenoah . Just make sure you use a good coupler . I'll be testing a different coupler soon . More info on that shortly . There is a customer here that purchased a DaVette Sprint boat that is installing a Graupner pump but havn't heard the test results yet . Maybe Scott can fill us in
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Old 05-25-2010, 07:45 AM
  #302
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What do the Graupner pumps go for? I can't seem to find a price anywhere. Also, do they offr a trim adjustment on the nozzle?
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Old 05-25-2010, 10:42 AM
  #303
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Quote:
ORIGINAL: Dana W

The KMB works fine I just think the 40mm impeller is alittle small for a Zenoah . Just make sure you use a good coupler . I'll be testing a different coupler soon . More info on that shortly . There is a customer here that purchased a DaVette Sprint boat that is installing a Graupner pump but havn't heard the test results yet . Maybe Scott can fill us in
Funny thing, Dave just approached me last week at our race where I was running mine ... hey Scotty got time to put mine together ?
Sadly had to decline not having the time now spring/summer is here [] Seen the pump tho ... simple as heck & in no way close to the caliber of the Swash pump. Has an up/down reverse bucket and steering, No nosile trim.
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Old 05-25-2010, 02:31 PM
  #304
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Quote:
ORIGINAL: timjz

What do the Graupner pumps go for? I can't seem to find a price anywhere. Also, do they offr a trim adjustment on the nozzle?
http://www.highperformancemodels.com...et%20units.htm
http://www.cornwallmodelboats.co.uk/...upner_jet.html

Yes I was looking at getting the 3 pin coupling that graupner make for the unit and zenoah

How about the hull any thoughts on the size?




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Old 05-25-2010, 02:41 PM
  #305
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Quote:
ORIGINAL: daniel53


Most of the GAS power squirt hulls are @ 1 meter or less in length (*34-36" and fairly wide) Short and wide bodied are the sprint hulls [>:]

Quote:
ORIGINAL: timjz

What do the Graupner pumps go for? I can't seem to find a price anywhere. Also, do they offr a trim adjustment on the nozzle?
http://www.highperformancemodels.com...et%20units.htm
http://www.cornwallmodelboats.co.uk/...upner_jet.html

Yes I was looking at getting the 3 pin coupling that graupner make for the unit and zenoah

How about the hull any thoughts on the size?





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Old 05-25-2010, 02:49 PM
  #306
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Quote:
ORIGINAL: Scott Schneider

Quote:
ORIGINAL: daniel53


Most of the GAS power squirt hulls are @ 1 meter or less in length (*34-36" and fairly wide) Short and wide bodied are the sprint hulls [>:]

Quote:
ORIGINAL: timjz



What do the Graupner pumps go for? I can't seem to find a price anywhere. Also, do they offr a trim adjustment on the nozzle?
http://www.highperformancemodels.com...et%20units.htm
http://www.cornwallmodelboats.co.uk/...upner_jet.html

Yes I was looking at getting the 3 pin coupling that graupner make for the unit and zenoah

How about the hull any thoughts on the size?





do you think with 780mm long the CG will be to far forward, think it will prime ok? or should I look for a longer hull?

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Old 05-25-2010, 03:18 PM
  #307
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Default RE: Gas Jet Boaters

personally i think that 780mm (30") is a little bit small for the ZEN and RCMK option. if you do go that route it is going to be one heck of a ride. Mine is 1m (40") long. the davette boats i think are around 36" mark (someone correct me if im wrong). the small the boat the harder it is goingto be to cram all the running gear in. As for the 3pin coupler. i think they are quite expensive for what you are getting. I just use 2 collets and a flex shat in between.

cheers
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Old 05-25-2010, 06:22 PM
  #308
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Quote:
ORIGINAL: infinityteg

personally i think that 780mm (30") is a little bit small for the ZEN and RCMK option. if you do go that route it is going to be one heck of a ride. Mine is 1m (40") long. the davette boats i think are around 36" mark (someone correct me if im wrong). the small the boat the harder it is goingto be to cram all the running gear in. As for the 3pin coupler. i think they are quite expensive for what you are getting. I just use 2 collets and a flex shat in between.

cheers
steve
Hey steve thanks for your advise, im still pretty keen to give the small hull a try do you think there will be any other issues rather than just fitting the driveline in ?

Heres one Iprepared earlier the unit is just a guess as Idont know how long the inside part of the unit is? ive guessed 190mm
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Old 05-25-2010, 06:33 PM
  #309
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Default RE: Gas Jet Boaters

While a grey area in rigging it all ... using the smaller pumps like a KMB 40mm would be VERY TRICK using one of the Zenaoh 20cc engines with a marine conversion in a 30" hull
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Old 05-25-2010, 06:53 PM
  #310
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ORIGINAL: Scott Schneider

While a grey area in rigging it all ... using the smaller pumps like a KMB 40mm would be VERY TRICK using one of the Zenaoh 20cc engines with a marine conversion in a 30" hull

Sorry Ididnt quite understand what you mean there? KMB 40mm?

I was thinking of a 49mm Graupner with the 30" hull and the Zenoah
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Old 05-25-2010, 07:16 PM
  #311
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Default RE: Gas Jet Boaters

Yeah a 30" hull would work but I'd still make the engine compartment at least 20" . That will give you enough room to work inside . You'll still want to place your CG 9" from the transom . The DaVette Sprint boat is 34" long and I feel that's pretty symmetrical .
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Old 05-25-2010, 07:43 PM
  #312
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ORIGINAL: Dana W

Yeah a 30" hull would work but I'd still make the engine compartment at least 20" . That will give you enough room to work inside . You'll still want to place your CG 9" from the transom . The DaVette Sprint boat is 34" long and I feel that's pretty symmetrical .
On my cardboard model the rear of the engine is 9" from the transom do you think that would be about right?
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Old 05-25-2010, 08:15 PM
  #313
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Default RE: Gas Jet Boaters

I got a little more done. Here's some pics of the rollbar being mounted in the hull. The full process of building the carbon rollbar is over on the Snikwah forum.

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Old 05-25-2010, 08:21 PM
  #314
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Default RE: Gas Jet Boaters

Its going to be very tight but worth a go. to get the CG back enough you might have to place the radio gear above/around the drive line.

The KMB 40mm is a jet unit that Dana is using in his sprint boat. it has a 40mm ipellor rather than the Graupners being 50mm< Scott thinks that a Zen or Rcmk will be abit too much torque for the 40mm unit.

Where abouts in NZ are you. were more than welcome to come round and have a look at mine for some ideas if your in the auck region?

cheers
steve
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Old 05-25-2010, 08:45 PM
  #315
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Quote:
ORIGINAL: infinityteg

Its going to be very tight but worth a go. to get the CG back enough you might have to place the radio gear above/around the drive line.

The KMB 40mm is a jet unit that Dana is using in his sprint boat. it has a 40mm ipellor rather than the Graupners being 50mm< Scott thinks that a Zen or Rcmk will be abit too much torque for the 40mm unit.

Where abouts in NZ are you. were more than welcome to come round and have a look at mine for some ideas if your in the auck region?

cheers
steve

Unfortunatly im in Dunedin and Ijust about need a jet boat to travel around at the moment due to flooding
I think Iwill just have to give it a go and see what happens, it doesnt seem that im doing anything majorly wrong, will be interesting to see how it pans out. Would be nice to talk to some one that has used the graupner jet unit before to see how it performs
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Old 05-29-2010, 08:21 PM
  #316
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Default RE: Gas Jet Boaters

guys i am looking to buy a jet unit does anybody have a swashdrive unit that they want to sell ??

i have been looking at the graupner unit but i would prefer to hold off untill i could hopefully find a swashdrive unit !!

thanks
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Old 05-29-2010, 11:42 PM
  #317
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ORIGINAL: aussier6er

guys i am looking to buy a jet unit does anybody have a swashdrive unit that they want to sell ??

i have been looking at the graupner unit but i would prefer to hold off untill i could hopefully find a swashdrive unit !!

thanks
The Swashdrive pumps are the gold standard in pumps and VERY sought after ..... hope you can find one
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Old 05-31-2010, 03:56 AM
  #318
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after looking at the graupner units could someone please advise how these are mounted in to the hull ?

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Old 05-31-2010, 07:20 AM
  #319
Dana W
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Default RE: Gas Jet Boaters

I heard you glass it in . Similar to the KMB installation .
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Old 06-04-2010, 03:17 AM
  #320
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Default RE: Gas Jet Boaters

Here's the latest on my build. I've got the engine mounted, the radio box & linkages installed & all the trims set up. I had to make an extension to the coil relocator so that I could still use the over pullstart relocator, yet shift the recoil 90 degrees to allow the trim push rod room to pass the engine. I just need to drop it off to get the custom pipe made up & then get teh 29cc top end kit modified. After that I'll do the fuel tank & lines then test it before I add the design work.

I've added the pool noodle after I took these pics too.

Here's the pics.
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Old 06-04-2010, 05:42 PM
  #321
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Default RE: Gas Jet Boaters

Dicko,
Looking good !! .... your spacing of pump/engine/radio gear looks very much like my Davette build.
*What C/G numbers are you coming up with set up the way you are showing it ?
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Old 06-07-2010, 12:24 AM
  #322
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Hi Scott,

The COG with the pool noodles in & without the pipe or fuel cell is at the front of the rollbar. I'm hoping once the tank & pipe are in the COG will be at the back or just behind the roll bar. I have an excess of noodles in there now, I can remove some to move the COGfurther back if required.

Cheers
Jason
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Old 06-07-2010, 08:04 PM
  #323
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Quote:
ORIGINAL: dicko

Hi Scott,

The COG with the pool noodles in & without the pipe or fuel cell is at the front of the rollbar. I'm hoping once the tank & pipe are in the COG will be at the back or just behind the roll bar. I have an excess of noodles in there now, I can remove some to move the COGfurther back if required.

Cheers
Jason
That is fine and good .. was looking for actual numbers tho
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Old 06-07-2010, 09:54 PM
  #324
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I'll measure it when I get home from work. I'm on my lunch break now.
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Old 06-08-2010, 12:00 AM
  #325
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Default RE: Gas Jet Boaters

Dicko,

Yours ..... [img]{akamaiimageforum}/upfiles/91577/At55190.jpg[/img]

Mine ..... [img]{akamaiimageforum}/upfiles/404891/Ge96653.jpg[/img]


So close in lay out .... I do need to scrunch mine up a bit tighter and move the CG back tho ... Maybe next winter, right not it's running and getting played with [:@]
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