RE: Gas Jet Boaters    Gallery
View related threads: (in this forum | in all forums)

Logged in as Guest



Users viewing this topic: none
    Search This Thread  
 
Printable Version



All Forums >> RC Boats >> Speed - RC Gas Boats >> RE: Gas Jet Boaters Page: <<   < prev  10 11 12 13 14 15 16 17 18 [19]

Tower Hobbies Get Coupon Codes Brands  
Login
Message << Older Topic   Newer Topic >>
RE: Gas Jet Boaters - 10/17/2012 11:18 PM   
The Ghost



Posts: 1751
Score: 110
Joined: 3/18/2004
Last Login: 6/20/2013
From: UlladullaNSW, AUSTRALIA
Status: offline
quote:

ORIGINAL: phillio35

how did you the gasket between hull and pump thanks

I use truck inner tubes because they are thicker material. As seen in the photo, you also have to remove the moulding on the joining line to get a good seal. I have mine out as I am replacing the seal.

Cheers

Attachments
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize


_____________________________

Remember, Always look after the ORGANIC part of the model

Hide Signatures

(in reply to phillio35)
       Post #: 451

RE: Gas Jet Boaters - 10/19/2012 5:19 PM   
phillio35


 

Posts: 54
Score: 100
Joined: 3/25/2012
Last Login: 6/18/2013
From: essex, UNITED KINGDOM
Status: offline 		thanks ghost i filled mine got the gasket from adam after i got the pump heres some pics of mine

Attachments
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize


Hide Signatures

(in reply to The Ghost)
       Post #: 452

RE: Gas Jet Boaters - 10/23/2012 1:10 PM   
kamipalms


 

Posts: 110
Score: 105
Joined: 10/5/2009
Last Login: 6/20/2013
From: Mandurah, AUSTRALIA
Status: offline 		quick update











_____________________________

Evolution RC Australia


Hide Signatures

(in reply to phillio35)
       Post #: 453

RE: Gas Jet Boaters - 10/23/2012 9:57 PM   
The Ghost



Posts: 1751
Score: 110
Joined: 3/18/2004
Last Login: 6/20/2013
From: UlladullaNSW, AUSTRALIA
Status: offline 		Kamipalms
It's looking great, can't wait to see the video of it on the water.
Cheers

_____________________________

Remember, Always look after the ORGANIC part of the model

Hide Signatures

(in reply to kamipalms)
       Post #: 454

RE: Gas Jet Boaters - 6/7/2013 9:49 PM   
bermylizard


 

Posts: 5
Score: 100
Joined: 9/26/2009
Last Login: 6/19/2013
From: EdinburghMidlothian, UNITED KINGDOM
Status: offline 		I am looking for a Jet drive for a 26cc CY engine in a 1000mm custom jet sprint hull I am designing. Plans will be available soon. For now I want to discuss Jet drives/pumps, build quality and thrusts ratings for the various jet drives available. 

My research indicates Jettec NZ is the bees knees, but you pay for it $780 + delivery, and stock is hard to come by.
http://www.jettec.co.nz/#/shop/45634...Jettec/2208552

Then MHZ does two jets for 26cc engines , the Jet 4 and the Jet 52. Neither one comes with a grate.  http://www.mhz-powerboats.com/category-11/category-22/

The MHZ Jet 52 is $380 + delivery with 120-240N static thrust.
The MHZ Jet 4 is $255 + delivery with 140N static thrust.

Then there is the HobbyKing XL pump for $392
http://www.hobbyking.com/hobbyking/store/__13388__CNC_Precision_Jet_Boat_Drive_X_Large.html
Apparently build quality is good in some areas or the pump (impeller, stator) and poor in others (housing). There is no performance data on the pump.

Some user thoughts/info on HK pumps can be found here:  http://modeljetboat.com/forum/index....52.msg2547#new

Then there is Graupner Jet Propulsion Unit 5 (2347) not currently available but some have said the performance is okay.

Gravitix, I found today?
http://www.rcnz.com/Shop/Service/Detail/Product/6905

MHZ seems to be the only manufacturer to give thrust values. I want to see more technical details about the pumps. Perhaps users of the different pumps can offer some insight into the pumps performance? I heard that Jettec was 36% efficient compared to Graupner 18%, but have no details on the test procedure etc. Just numbers.

I am looking to build a review to help justify the cost and performance gains from one pump to the next.

If you own one of these pumps or other (with approx 50mm impellor for 26+cc engines) please drop a line to help.

How is the build quality?
What power pack do you have? (26cc modded or not etc.)
Have you measured static thrust? If so how much?
Is it reliable?

As the info comes together I will put in an easy and digestible form to help others make 'informed' purchases.

Thanks for your help,
Bermylizard

< Message edited by bermylizard -- 6/8/2013 3:04 PM >

Hide Signatures

(in reply to The Ghost)
       Post #: 455

RE: Gas Jet Boaters - 6/7/2013 10:52 PM   
The Ghost



Posts: 1751
Score: 110
Joined: 3/18/2004
Last Login: 6/20/2013
From: UlladullaNSW, AUSTRALIA
Status: offline 		Bermylizard
The Jettec unit is a great unit, I am running with RCMK K30S out of the box, No problems with the jet unit. You say that stock is hard to come by, I have two and had no problem with delivery, within a week. Have not checked thrust as I have built the jet boats just to have fun.

Cheers

_____________________________

Remember, Always look after the ORGANIC part of the model

Hide Signatures

(in reply to bermylizard)
       Post #: 456

RE: Gas Jet Boaters - 6/8/2013 1:50 AM   
bermylizard


 

Posts: 5
Score: 100
Joined: 9/26/2009
Last Login: 6/19/2013
From: EdinburghMidlothian, UNITED KINGDOM
Status: offline 		Thanks for your feedback.

I said that stock is hard to come by because the website says it is sold out. That said, it also says a few lines down that it is now available.  So not sure what to believe. I'd like to be wrong and the pump available, but then I would also like to have the $1000NZD for the pump. =)

I am just trying to work out best bang for buck. Effectively i can acquire 2 MHZ pumps for the price of one Jettec pump, and that does not even consider import tax for the Jettec to the UK (if any).  I am a firm believer that you get what you pay for. At the same time I would like to know what I am paying for in terms of performance and quality. Why should I buy the Jettec over the MHZ or other pump?

I also am having fun, but I check the thrust for fun, I must be a sad engineer  =)  Thanks again for your input, keep em coming.

Do you have any more specs? Top speed? max rpm? what ever you got, I would like to have it as I am building a spreadsheet that I populate based on information on the web (youtube videos and other forums), to try and simplify a decade of RC jet pump development. Does populating spreadsheets for fun make me really sad? Haha 

Thanks again,


Hide Signatures

(in reply to The Ghost)
       Post #: 457

RE: Gas Jet Boaters - 6/9/2013 1:02 AM   
bermylizard


 

Posts: 5
Score: 100
Joined: 9/26/2009
Last Login: 6/19/2013
From: EdinburghMidlothian, UNITED KINGDOM
Status: offline 		So here is the start of the table, can you help fill any sections in?
 
Brand Model Req Power (Hp) Static Thrust (N) RPM Impeller D (mm) Impeller Blades Impeller Pitch Materials Length Height Width Mass Shaft D
Jettec Jet Unit < 8 ? 16000 55     Plastic/Composit 270 80 70 900 8
MHZ Jet 4   140   49     Aluminium? 240 85   606 7
MHZ Jet 52 3 120-240 16000 52     Aluminium? 210 80 81 670 8
Graupner Jet 5 (2347)       49 5   Aluminium? 285 85 78 545 7
Hobby King XL Jet Pump       53 4   Aluminium? 220 80 80   8
Gravitix D50 >0.5     49 3,4,5   Plastic 265 85 76 270 6


Hide Signatures

(in reply to bermylizard)
       Post #: 458

Page:   <<   < prev  10 11 12 13 14 15 16 17 18 [19]
All Forums >> RC Boats >> Speed - RC Gas Boats >> RE: Gas Jet Boaters
Page: <<   < prev  10 11 12 13 14 15 16 17 18 [19]





Jump to:


 
Google 



Search | Marketplace | Event Calendar | Local Clubs | Magazine | Product Ratings | New Products | Discussion Forums

Photo Gallery | Instructor Search | Field|Track|Marina Search

Advertisers | Hobby Vendor Resources | Rate Manufacturers | Sign In/Sign Up

SITE MAP!   : :   FORUM RULES

RC Universe is a service of Internet Brands, Inc. Copyright © 2001-2013.

Charities we support that also need your help
Yorkie Rescue | Humane Society | ASPCA | Crohn's-Colitis America


0.734RCU1