RE: The Unofficial all things Jet drive thread    Gallery
View related threads: (in this forum | in all forums)

Logged in as Guest



Users viewing this topic: Lleksam
    Search This Thread  
 
Printable Version



All Forums >> RC Boats >> Speed - Electric >> RE: The Unofficial all things Jet drive thread Page: <<   < prev  186 187 188 189 190 191 [192] 193 194 195   next >   >>  

Tower Hobbies Get Coupon Codes Brands  
Login
Message << Older Topic   Newer Topic >>
RE: The Unofficial all things Jet drive thread - 4/21/2012 5:24 PM   
Quicksilver



Posts: 842
Score: 100
Joined: 7/27/2006
Last Login: 5/20/2013
From: Poughkeepsie, NY, USA
Status: offline
quote:

ORIGINAL: sundogz

Long time gone, Quicksilver,. IB3600 equivalent - 16cell? Wasn't the IB3600 a 6 or 7 cell (7.4 to 8.4v) NIMH with 3600mah capacity and a 30C (thereabouts) discharge rating? A 2S (7.4v) lipo now will give you much more capacity or run time than the NIMH for the same weight (or the same capacity for less weight). You will be surprised and happy. Welcome back!


I didn't buy packs. I made them so their two 8 cell packs. so whats that 6s-7s?



_____________________________

If you can imagine it....


Hide Signatures

(in reply to sundogz)
       Post #: 4776

RE: The Unofficial all things Jet drive thread - 4/21/2012 5:59 PM   
sundogz



Posts: 1352
Score: 129
Joined: 11/24/2008
Last Login: 5/22/2013
From: Harriet, AR, USA
Status: offline 		16c NIMH at 1.2v/cell is 19.2v. A 1s lipo is 3.7v, so the closest match would be 5S (18.5v). This Turnigy 30C is a good buy and located at the U.S. Hobbyking warehouse.

_____________________________

Arpro Mono,Genesis,Tenshock Essenz, PowerJet Viper,ABC Jet Ski,TearInto Jet Sprint, Legend & Discovery Sailers, JetCat proto

Hide Signatures

(in reply to Quicksilver)
       Post #: 4777

RE: The Unofficial all things Jet drive thread - 4/22/2012 8:19 PM   
Quicksilver



Posts: 842
Score: 100
Joined: 7/27/2006
Last Login: 5/20/2013
From: Poughkeepsie, NY, USA
Status: offline 		that isnt a bad price I might just buy that

thank you


_____________________________

If you can imagine it....


Hide Signatures

(in reply to sundogz)
       Post #: 4778

RE: The Unofficial all things Jet drive thread - 5/14/2012 1:43 AM   
EdgardoJr



Posts: 346
Score: 100
Joined: 10/2/2008
Last Login: 4/29/2013
From: Mandaluyong CityManila, PHILIPPINES
Status: offline 		http://www.youtube.com/watch?v=Wb_bgR78mCY&feature=g-upl

_____________________________

SCIENTIA MAXIME CUUM VIRTUTE "92 - DYNAM T-28 TROJAN - FMS MINI T-28 TROJAN

Hide Signatures

(in reply to Quicksilver)
       Post #: 4779

RE: The Unofficial all things Jet drive thread - 8/5/2012 2:44 AM   
Madmax160764


 

Posts: 61
Score: 100
Joined: 8/11/2008
Last Login: 4/14/2013
From: Laval, QC, CANADA
Status: offline 		NQD Jet boat dymo, new motor (4800Kv) and batteries Turnigy Nano-Tech 1.8



Hide Signatures

(in reply to EdgardoJr)
       Post #: 4780

RE: The Unofficial all things Jet drive thread - 8/5/2012 2:54 AM   
diy-pro


 

Posts: 192
Score: 100
Joined: 6/24/2012
Last Login: 11/8/2012
From: , TX, USA
Status: offline 		lovin it mad max sweet little jet drive :]]] 

Hide Signatures

(in reply to Madmax160764)
       Post #: 4781

RE: The Unofficial all things Jet drive thread - 8/5/2012 6:36 AM   
Madmax160764


 

Posts: 61
Score: 100
Joined: 8/11/2008
Last Login: 4/14/2013
From: Laval, QC, CANADA
Status: offline 		NQd Tear-Into carnage bashing in pool.



< Message edited by Madmax160764 -- 8/8/2012 6:02 AM >

Hide Signatures

(in reply to diy-pro)
       Post #: 4782

RE: The Unofficial all things Jet drive thread - 8/28/2012 5:03 PM   
pootis mcgootis


 

Posts: 10
Score: 100
Joined: 6/1/2012
Last Login: 2/13/2013
From: Ontario, ON, CANADA
Status: offline 		Hi All,

Just ordered two KMB 28mm jet drives, always had an interest in building a dual jet hull. Any suggestions on a suitable hull? Interested in something that is widely available, even through HK is fine just nothing caught my eye. Any suggestions towards motor/batt combos would be much appreciated as well. Thinking a low kV motor with a higher cell count LiPo...

Thanks,
P


Hide Signatures

(in reply to Madmax160764)
       Post #: 4783

RE: The Unofficial all things Jet drive thread - 9/19/2012 9:52 PM   
Jay-Em


 

Posts: 15
Score: 100
Joined: 3/8/2011
Last Login: 12/19/2012
From: GroningenGroningen, NETHERLANDS
Status: offline 		Informative thread.

However, I am still somewhat in the dark about the Graupner Mini-jet, and the ideal motors to run it.

At the moment I use the mini-jet, coupled with a hobbywing 10t BL 550 ( an SC motor) and it runs nice, cool, I get about 20min on a 4ah lipo. Hobbywing SC 75amp ESC keeps cool too. All of it watercooled though.
All of it is custom fit in a 48cm Kyosho WaveChopper jetski.

Point is, I see all sorts of ideal RPM proposed for the tiny jet, but no definitive rpm. The 550 is a 3500kv. I run it on 2s, and it seems to get pretty close to the full 25000 rpm. It has a habitof spinning-out, but a little judicious throttle control fixes that nice. It rides a nice, stable 5 degrees nose-up when on-plane, no porpoising whatsoever, so the pump gets primed well.

Is that 25000rpm too much? The speed is a sedate 25km/h or thereabout, since I go quite a bit faster than the Bicycles on the adjacent path of my favourite pond.
I tried 3s, but that only made a lot of noise and cavitation, speed only marginally increased.

In tne past I have experimented with the advised speed500 race (I guess it is a 21t 540) a Speed600race and a 17t double corally. All of those variations ran well, not really fast, but got very very hot, and killed their magnets, despite watercooling. The BL 550 is the first motor NOT to cook or burn... Must have done something right there

It just made me wonder: is that 25000 the limit of what the little Graupner jet can effectively use? In other words, 30kph is the end. Higher speed needs a bigger jet?


Hide Signatures

(in reply to sundogz)
       Post #: 4784

RE: The Unofficial all things Jet drive thread - 9/21/2012 3:41 AM   
damfurst


 

Posts: 422
Score: 100
Joined: 8/13/2007
Last Login: 4/28/2013
From: Lewistown, MT, USA
Status: offline
quote:

ORIGINAL: Jay-Em


It just made me wonder: is that 25000 the limit of what the little Graupner jet can effectively use? In other words, 30kph is the end. Higher speed needs a bigger jet?



There is only so much 19mm can do A bigger jet drive in the same size hull will make the hull go faster. This has been proven on the other jet drive thread with the Nqd tear into where some have put the bigger Graupner 29mm, Kehrer 28mm, and Abc Hobby 22mm. I hope this answers your question.

Hide Signatures

(in reply to Jay-Em)
       Post #: 4785

RE: The Unofficial all things Jet drive thread - 9/21/2012 2:04 PM   
sundogz



Posts: 1352
Score: 129
Joined: 11/24/2008
Last Login: 5/22/2013
From: Harriet, AR, USA
Status: offline
quote:

ORIGINAL: Jay-Em
It just made me wonder: is that 25000 the limit of what the little Graupner jet can effectively use? In other words, 30kph is the end. Higher speed needs a bigger jet?

So far as the Graupner and NQD drives, I have been advising that 3000kv on 3S and 4500kv on 2S seems to be tops with a 20mm motor. That comes out to 33000rpms unloaded. So you can get a little more speed than you have attained so far. But to get more speed yet, you'll need to go to a larger jet as Damfurst said, or go to a larger motor which will push through the 'envelope'. Or both. The larger motors seem less prone to the kv limitations of the smaller motors - where, in the upper 1/4 of the throttle range more throttle results in more noise, not more speed.

_____________________________

Arpro Mono,Genesis,Tenshock Essenz, PowerJet Viper,ABC Jet Ski,TearInto Jet Sprint, Legend & Discovery Sailers, JetCat proto

Hide Signatures

(in reply to Jay-Em)
       Post #: 4786

RE: The Unofficial all things Jet drive thread - 9/22/2012 3:40 AM   
Jay-Em


 

Posts: 15
Score: 100
Joined: 3/8/2011
Last Login: 12/19/2012
From: GroningenGroningen, NETHERLANDS
Status: offline 		hmm..okay.. The motor is a large 550. (3650/540L) meant for Stadium trucks, not a 20/380/400 class. it has plenty of oommph, It feels more like over-revving a too small prop.
Well.. I guess it's going to be Stabilit-hacking, and fitting a 28 Kehrer, then.

Ugh.. I had hoped to prevent having to cut'n grind away at the Stabilit mounds around the jet.. I only hope the not-so-impressive performance of the WaveChopper with a jet is not because of some design-flaw. Improbable, I know. I studied quite some Seadoos, and the kyo's hull is not bad at all, but one never knows.....

Hide Signatures

(in reply to sundogz)
       Post #: 4787

RE: The Unofficial all things Jet drive thread - 9/22/2012 3:25 PM   
sundogz



Posts: 1352
Score: 129
Joined: 11/24/2008
Last Login: 5/22/2013
From: Harriet, AR, USA
Status: offline 		My ABC Hobby Jet Ski's were factory equipped with 550 brushed motors (I don't know the rpm range) but the swap for the 28mm brushless motor brought much more speed and with it some aeration problems (another story) so made quite a difference. But in all fairness, they have 23mm impellers which might have helped a bit as well.

_____________________________

Arpro Mono,Genesis,Tenshock Essenz, PowerJet Viper,ABC Jet Ski,TearInto Jet Sprint, Legend & Discovery Sailers, JetCat proto

Hide Signatures

(in reply to Jay-Em)
       Post #: 4788

RE: The Unofficial all things Jet drive thread - 9/22/2012 4:33 PM   
Jay-Em


 

Posts: 15
Score: 100
Joined: 3/8/2011
Last Login: 12/19/2012
From: GroningenGroningen, NETHERLANDS
Status: offline 		Those ABC's seem to have been "put away" under the monniker "toy-grade", but, the more I read about them, the more impressing they become.
I searched e-bay, but the ABC's seem to be completely gone. Shame.

23mm You say? Hmm.. The Graupner is a 20mm. It could, indeed, explain the excessive aeration I get when putting 11.1v through the eazyrun 550..

Doesn't the ABC have some kind of baffle in the jet-exhaust? I distinctly remember a picture of it with some sort of rubber ring in the nozzle.

On another note: I fixed the spinning-out by copying a system straight from a Seadoo. Sponson-blades. It'll stíll spin-out when trying to turn really sharply on full throttle, but that's to be expected. Most speedboats do that. I am already happy enough that it'll corner at áll.

Hide Signatures

(in reply to sundogz)
       Post #: 4789

RE: The Unofficial all things Jet drive thread - 11/13/2012 5:37 AM   
BIG22BIRD


 

Posts: 284
Score: 100
Joined: 11/17/2007
Last Login: 1/12/2013
From: CHILLIWACK, BC, CANADA
Status: offline 		well here is some updates, i have had a long r/c brake. and i finally put some batteries in my charger this morning, here are some progress pics. its dont now and loads of fun once again.






_____________________________

If it doesnt melt... its not fast enough!!!

Hide Signatures

(in reply to Jay-Em)
       Post #: 4790

RE: The Unofficial all things Jet drive thread - 11/13/2012 5:39 AM   
BIG22BIRD


 

Posts: 284
Score: 100
Joined: 11/17/2007
Last Login: 1/12/2013
From: CHILLIWACK, BC, CANADA
Status: offline 		some more progress, motor is mounted , shoegoo is my friend.





mounted the water pick -up. added some other stickers and a few coats of clear coat.






also added my grate.
i still need to mount my ride plate.








_____________________________

If it doesnt melt... its not fast enough!!!

Hide Signatures

(in reply to BIG22BIRD)
       Post #: 4791

RE: The Unofficial all things Jet drive thread - 11/13/2012 5:40 AM   
BIG22BIRD


 

Posts: 284
Score: 100
Joined: 11/17/2007
Last Login: 1/12/2013
From: CHILLIWACK, BC, CANADA
Status: offline






_____________________________

If it doesnt melt... its not fast enough!!!

Hide Signatures

(in reply to BIG22BIRD)
       Post #: 4792

RE: The Unofficial all things Jet drive thread - 11/13/2012 6:05 AM   
BIG22BIRD


 

Posts: 284
Score: 100
Joined: 11/17/2007
Last Login: 1/12/2013
From: CHILLIWACK, BC, CANADA
Status: offline 		here is my water outlet, i used the exhaust pipes, instead of a hole out the back.

http://www.youtube.com/watch?v=M9TCJrL4V_Y&feature=youtu.be

_____________________________

If it doesnt melt... its not fast enough!!!

Hide Signatures

(in reply to BIG22BIRD)
       Post #: 4793

RE: The Unofficial all things Jet drive thread - 11/13/2012 1:45 PM   
sundogz



Posts: 1352
Score: 129
Joined: 11/24/2008
Last Login: 5/22/2013
From: Harriet, AR, USA
Status: offline 		I like the driver - he looks ominous enough for sure. That boat will be another monster! The only reservation I have is the water through the headers is difficult to see to know if the cooling flow is sufficient. That is why I usually direct it up and out like a jet ski. Yep, shoe goo is good stuff, to be sure. Good job. Looking forward to a video of it in action.

_____________________________

Arpro Mono,Genesis,Tenshock Essenz, PowerJet Viper,ABC Jet Ski,TearInto Jet Sprint, Legend & Discovery Sailers, JetCat proto

Hide Signatures

(in reply to BIG22BIRD)
       Post #: 4794

RE: The Unofficial all things Jet drive thread - 11/16/2012 1:00 AM   
seehuusen


 

Posts: 278
Score: 100
Joined: 1/12/2012
Last Login: 5/25/2013
From: Sunshine Coast, AUSTRALIA
Status: offline 		hell yeah!! Looks great Big Bird I actually like the water out of the headers, hahaha Great ideas here

Hide Signatures

(in reply to sundogz)
       Post #: 4795

RE: The Unofficial all things Jet drive thread - 11/16/2012 2:38 AM   
SkR8Pn


 

Posts: 66
Score: 100
Joined: 10/31/2010
Last Login: 5/24/2013
From: sydney, AUSTRALIA
Status: offline 		 Good to see V2 up and running,  nice work! I should start on my second big jet tear into also. A lot of lessons learnt after the first one! May it rest in peace... 

_____________________________

SCX10 Truggyx2, Wraith
Ota R31, 16FM, D3.

Hide Signatures

(in reply to BIG22BIRD)
       Post #: 4796

RE: The Unofficial all things Jet drive thread - 11/18/2012 3:42 AM   
BIG22BIRD


 

Posts: 284
Score: 100
Joined: 11/17/2007
Last Login: 1/12/2013
From: CHILLIWACK, BC, CANADA
Status: offline 		here is a shot of my ride plate and the water exit.







_____________________________

If it doesnt melt... its not fast enough!!!

Hide Signatures

(in reply to SkR8Pn)
       Post #: 4797

RE: The Unofficial all things Jet drive thread - 2/7/2013 11:05 PM   
Vidjaya


 

Posts: 1
Score: 100
Joined: 2/7/2013
Last Login: 2/7/2013
From: Kirov, RUSSIA
Status: offline 		Hi.
I bad speak English, but I would like to ask in this topic.

Has built the boat. Weight with battery 2.2 kg, 590 x 180 mm. Time to swim 5 minutes. The speed of the gps 30 km / h. The boat is floating in 50% of the gas, if 100% of the gas, the rotation of the increase, and the speed of the no.

Jet 28-mm-Jet with short steering nozzle
http://www.jet-drive.de/index.php?page=shop.product_details&flypage=shop.flypage&product_id=9&category_id=4&manufacturer_id=0&option=com_virtuemart&Itemid=17

Motor Neu-Castle 1410 1Y 3800kv 4 Pole
http://www.amainhobbies.com/product_info.php/cPath/1_221_1889_1890/products_id/222734/n/Castle-Creations-1410-1Y-4-Pole-Brushless-Motor-w-5mm-Shaft-3800kV

Esc Turnigy Marine 180A Brushless Boat ESC
http://hobbyking.com/hobbyking/store/__8937__Turnigy_Marine_180A_Brushless_Boat_ESC.html

Battery Turnigy 5000mAh 2S 40C Lipo Pack
http://hobbyking.com/hobbyking/store/__10305__Turnigy_5000mAh_2S_40C_Lipo_Pack.html

Video
http://www.youtube.com/watch?v=53WCBOT_bLE&feature=player_embedded

Foto
http://forum.rcdesign.ru/f68/thread304846.html

I want to:
Swim of 15 minutes. (It is important)
Speed of 30 - 50 km/h.
Size of 600 mm.
Batteries 2S.

As you think:
Remake this boat? To build a new boat? What Motor to place? If the jet set 19 mm?
Very much I wait for your help.

Hide Signatures

(in reply to BIG22BIRD)
       Post #: 4798

RE: The Unofficial all things Jet drive thread - 4/15/2013 2:41 PM   
sundogz



Posts: 1352
Score: 129
Joined: 11/24/2008
Last Login: 5/22/2013
From: Harriet, AR, USA
Status: offline 		Well, it has been a while since this tread has seen some action, so I'll show a recent project of mine. I purchased a used 24" nonstepped cat hull from a seller on ebay. I had been watching for such a hull for quite some time, since first seeing one for sale on another site a year or so earlier. It had the odor of a burned up speed control along with black discoloration under the canopy. The NQD drives I had would fit perfectly in the sponsons with a bit of work.

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 		Click to see fullsize image.
Click for fullsize


_____________________________

Arpro Mono,Genesis,Tenshock Essenz, PowerJet Viper,ABC Jet Ski,TearInto Jet Sprint, Legend & Discovery Sailers, JetCat proto

Hide Signatures

(in reply to Vidjaya)
       Post #: 4799

RE: The Unofficial all things Jet drive thread - 4/15/2013 2:51 PM   
sundogz



Posts: 1352
Score: 129
Joined: 11/24/2008
Last Login: 5/22/2013
From: Harriet, AR, USA
Status: offline 		I prepped the jet drives by removing casting marks from inside, and reshaping the intake ramps. I used Shoe Goo this time (first for me) to install the drives in the hull, and it was faster and easier than epoxy. It took two applications, but the drive bodys are now a part of the hull. I've filled the previous holes in the transom and the former stuffing tube hole, sanded and primered the stern, installed the steering system using some heli parts I had laying around. I fabricated a servo mount where you can remove the servo by just cutting a zip tie, because a screwdriver would be difficult to get in there later on. I dremeled (is that a verb now?) down all those offending epoxy mounds from previous attachments and encounters and (though it doesn't look it in the photos) the deck is relatively smooth now. I've got to drill 4 more holes through the transom to facilitate a long hex screwdriver to more easily remove the motors, and I'll just cover the holes with hockey tape or a decal. And I need to install water pickups on the jets. Waiting on the esc's/motors and the SicRc couplers. Each jet will have it's own motor, cooling, esc and lipo, so will be semi-redundant to the Rx. If something should go wrong, it should make it back on the other jet (that's two 'shoulds', I know). I'm sticking with a single (med size) servo system for now, but am entertaining the idea of removing the steering nozzles completely, and going to Vector steering to see how effective that is. I've not seen a FE Cat hull done with jets low in the sponsons - I've seen 'em in troughs, and in the tunnel and none impressed me very much - other than to get me thinking of how to correctly pull it off. It works well for Ferry Boats, and they have zero turning radius! This boat fit the bill, what with no steps and sponsons just the right size for the NQD drives. I had to cut off the mounting tabs to fit them in

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


_____________________________

Arpro Mono,Genesis,Tenshock Essenz, PowerJet Viper,ABC Jet Ski,TearInto Jet Sprint, Legend & Discovery Sailers, JetCat proto

Hide Signatures

(in reply to sundogz)
       Post #: 4800

Page:   <<   < prev  186 187 188 189 190 191 [192] 193 194 195   next >   >>  
All Forums >> RC Boats >> Speed - Electric >> RE: The Unofficial all things Jet drive thread
Page: <<   < prev  186 187 188 189 190 191 [192] 193 194 195   next >   >>  




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


1.735RCU1