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Author Topic: Jet Tenby  (Read 22755 times)

hama

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Jet Tenby
« on: October 26, 2008, 07:04:20 pm »
Hi!
I thought that I for some reason needed a side project to the build of Smit London. I wanted the FSB Tenby when I first saw her, I very much wanted to try a waterjet propelled boat. With limited budget there was one obvious solution, combine the two.  :D  So, I modified the hull to take the Graupner mini jet. The prop tunnel in the hull was "filled in" to get the waterjet at the right waterline, this also gave me more buoyancy. The bath tub tests were very successful, there seems to be quite some speed in her and the manoeuvrability is superb. She spins on the spot! Now I cant wait for the sea trials!  %%
Hama.
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TorViking

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Re: Jet Tenby
« Reply #1 on: October 26, 2008, 07:10:09 pm »
A Brave Man!
Well done mate,looking good ,can't wait to see this go myself.Just wait for the flack from the lifeboat purists (get a hard hat).but in my humble opinion a great idea and keep us up to date!

Kind wishes

Andy.
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hama

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Re: Jet Tenby
« Reply #2 on: October 26, 2008, 10:40:48 pm »
Hi Andy and thanks!
Well, brave or stupid. Perhaps I'll get the hard hat on then, and there is always the North sea between us so I think I'll be safe. Will let you know how she runs as soon as I get her in the water, I'm very curious my self.
All the best!
Hama
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hama

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Re: Jet Tenby
« Reply #3 on: October 27, 2008, 03:16:10 pm »
Ha,ha, maiden voyage!!
Took her out for the first time today. First tried on a 6v lead battery and to be honest it wasn't a rocket, but boy how fun it was to manoeuvre! Then tried on a 9,6V NiMh battery and off she went, almost like a rocket. Now I need some advise as I'm totally new to "fast" electrics. The motor is the supplied graupner speed 400 6-7,2V, so I can't use the 9,6V battery without damageing the motor right? On 6V she was to slow to be any fun. I could get a 7,2V battery which I think would give me a descent speed. I could also change motor to a speed 500 or 600 cause thats what the mini-jet is designed for. I think I rather have moderate speed and long run time than "warp speed" and short run time. Any ideas anyone?
Here are some pics from the test runs.
Hama.
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andrewh

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Re: Jet Tenby
« Reply #4 on: October 27, 2008, 04:30:13 pm »
hama - that's fun and impressive - thanks for posting it :}

<<The motor is the supplied graupner speed 400 6-7,2V, so I can't use the 9,6V battery without damageing the motor right?>>

Oh yes you can :}.  This seems to be the marine version of a Ducted Fan, where you need revs, revs and more revs to get any excitement.  The voltage on a "Speed" motor is really a code about the winding wire and resistance, not a restriction on voltage.  (It is more like a middle  voltage for medium (aircraft) propellors)
I'm not sure which S400 you have, the S400 6V is different to the S4007.2V. 
You can run either of them on 9.6 V or more AS LONG AS YOU LET THEM REV HIGH, and keep the Amps below 10! (in other works keep the loads low)
There is another thing - this is a simple motor, and if you run it at high speed or close to 10A it has a limited life.  I'm not sure how boaters feel about this, but before the days of brushless motors hard flyers sometimes would change them after 5 flights, in the extreme case.  Having said that, I have never cooked a S400 despite running a S400 6V at 12V in a ducted fan.

Before thinking of a bigger motor, try more voltage
after that you could go to a S480 motor - similar size, longer case, more speed, or an inrunner brushless suitable for EDF use as S480 replacement.

More volts and more photos please
andrew

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hama

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Re: Jet Tenby
« Reply #5 on: October 27, 2008, 08:17:50 pm »
Hi Andrew!
Thanks for the answer, really appreciate it.  :-))  Great news on the voltage! I'll try again with the 9,6V battery then which is great as I have the battery and charger already. Next thing to find out is run time, she can take the load of two of these battery's with no problem.( I used an old battery for ballast on the trials ) If it works OK I guess I could get a second battery and put them in parallel. And as you state, it's not the end of the world IF the motor should break. I hear what you say, keep the revs up!  O0
Cheers!
Hama.
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romaink

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Re: Jet Tenby
« Reply #6 on: November 20, 2008, 12:49:49 am »
Hi,

A new member here from the other side of the pond (USA).

If you do decide to change motors I would suggest a Graupner Speed 600 to go with this Graupner Mini Jet Drive.  Next year I plan to build the American Enterprise by Dumas. It will be powered by two Graupner Mini Jet Drives(#2349) connected to Graupner Speed 600 9.6V motors(#1786).  These motors can supposedly handle up to 12V and 17 Amps. Battery will be a 3 cell Lipo to keep the weight down.

You might want to look into a motor like this for your boat.

Regards,

Richard
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hama

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Re: Jet Tenby
« Reply #7 on: November 20, 2008, 08:41:02 pm »
Hi Richard, and welcome to the forum!
Thanks for the advise, I'll keep that in mind. I'll try to get some colour and details on her soon and then do some more test driving. That is if there isn't any ice soon! I guess I will be tempted to try a 600 motor sometime in the future, even though I think she has good enough speed as is. Please be sure to show your American Enterprise build here, sounds very interesting.
Cheers!
Hama.
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hama

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Re: Jet Tenby
« Reply #8 on: December 18, 2008, 09:50:04 am »
Hi again!
I've started on the railings. They are made of brassrod. Once I got started it's very fun to solder this together. I use a small gas burner as my solderingiron didn't do the job. I'm quite pleased with the results so far as it's the first time I build up the railings like this. I use a little artistic freedom on the design as I've already deviated from the original when I put the jet propulsion on her.
Hama
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hama

  • Guest
Re: Jet Tenby
« Reply #9 on: December 19, 2008, 11:59:26 pm »
Hi again!
Some more railings, next will be the mast I think. This is fun!! I've learned so much.
Hama
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SteamboatPhil

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Re: Jet Tenby
« Reply #10 on: December 20, 2008, 12:08:02 am »
Nice job on the railings hama, and the boat looks good too. With the extra volts it will really look the part (maybe the full size chaps might take notice with the jet drive)  :-))
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Steamed up all the time

hama

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Re: Jet Tenby
« Reply #11 on: December 20, 2008, 12:23:59 am »
Thanks Steamboatphil!
I must say that they look a bit better on the pics than in real life, but thats OK. Like I said, I'm quite happy with them and it's a real joy making them. I thought I'd hate making them.
Merry Christmas!
Hama.
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hama

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Re: Jet Tenby
« Reply #12 on: December 20, 2008, 11:58:19 pm »
Mast!  :-)
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hama

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Re: Jet Tenby
« Reply #13 on: December 22, 2008, 10:49:32 pm »
A little more...
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dan

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Re: Jet Tenby
« Reply #14 on: December 22, 2008, 10:54:56 pm »
coming along nicely, keep up the good work and keep the pictures coming  :-))
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hama

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Re: Jet Tenby
« Reply #15 on: December 22, 2008, 11:13:33 pm »
Thanks! I'm afraid the shipyard will close during Christmas though, or?   %)
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hama

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Re: Jet Tenby
« Reply #16 on: January 01, 2009, 03:43:29 pm »
Actually got some more done before Christmas. Cut out the windows, made up a protective bar for the waterjet. One is made of ABS and the other of brass. Haven't decided which one to use yet.
Hama.
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craftysod

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Re: Jet Tenby
« Reply #17 on: January 01, 2009, 04:22:38 pm »
Some very nice and tidy brasswork there
Mark
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hama

  • Guest
Re: Jet Tenby
« Reply #18 on: January 01, 2009, 11:04:22 pm »
Thankyou Mark!
Got some more work done this evening, made the davits and screwed on the waterjet protection. Painting is getting closer!
Hama.
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hama

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Re: Jet Tenby
« Reply #19 on: January 03, 2009, 12:15:54 am »
Made a mess of the plastic tube for the towingbar in the stern.  {:-{  Didn't manage to bend it or glue it so I made it out of brass tube instead. Better stop soon before I sink the boat though, after all it's supposed to rescue others in distress.    :embarrassed:
Hama
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hama

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Re: Jet Tenby
« Reply #20 on: January 15, 2009, 10:40:11 am »
Almost done!
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hama

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Re: Jet Tenby
« Reply #21 on: January 16, 2009, 02:28:37 pm »
Hi again!
Found some open water at the beach for a test run with "colours". A bit difficult to take the photos as you drive though. Regret I didn't bring the Dicky tug as well because there was perfect modelboat ice to break!
Hama.
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Martin (Admin)

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Re: Jet Tenby
« Reply #22 on: January 16, 2009, 02:34:30 pm »
Happy with the speed?
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hama

  • Guest
Re: Jet Tenby
« Reply #23 on: January 16, 2009, 02:42:36 pm »
Hi there Martin!
Yes, I think so. Unfortunately it was a badly executed testrun as I had almost no batteries in the transmitter so I lost the signal all the time. I have two battery packs in her, one is for ballast only at the moment. Will do further tests later and figure out the best battery solution for speed and endurance. I'm having major problems with my internet at the moment, I'm being kicked out all the time.
Have a nice weekend!!
Hama.
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hama

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Re: Jet Tenby
« Reply #24 on: January 18, 2009, 06:26:08 pm »
Some more details added...
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