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Author Topic: Robbe Sea Jet  (Read 1304 times)

U-33

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Robbe Sea Jet
« on: January 03, 2014, 02:30:27 PM »

Chaps, any reason why I can't use a conventional single prop and rudder set up on a Sea Jet?


My previous one was built almost as standard, and wouldn't even attempt to turn whilst going astern (not that I minded, that one was built for speed) but this one is being built as a 'freelance designed, standoff scale, lake rescue craft' (c/w with gantry mounted flashing beacons and searchlights, etc) and as such I'd like to enter a regatta or two next season with it, so the reverse option is a must really.


So what do you reckon, guys...standard motor, 7.2 v, 3700 niMhs pack, motor mounted forward in the hull, and a conventionally placed and mounted submerged rudder?




Rich
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Rich

K-157 Vepr. Akula-II (project 971U)
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~~~~~~~  "Motorflotes need love too...."  ~~~~~~~

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U-33

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Re: Robbe Sea Jet
« Reply #1 on: January 03, 2014, 09:39:13 PM »

Hmm...guess that'll be a 'no' then...
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Rich

K-157 Vepr. Akula-II (project 971U)
---------------------------------------------------------------

~~~~~~~  "Motorflotes need love too...."  ~~~~~~~

MotorFlote build log : http://www.modelboatmayhem.co.uk/forum/index.php/topic,15222.0.html

Sparky

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Re: Robbe Sea Jet
« Reply #2 on: January 03, 2014, 10:41:12 PM »

I really don't feel qualified to answer, having seen some of your previous work, but I think if YOU think it'll
 
look and go OK  ..... do it, after all its your boat !!
 
regards,
 
Vic.
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U-33

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Re: Robbe Sea Jet
« Reply #3 on: January 04, 2014, 08:36:02 AM »

Well, thank you, kind sir...I'll give it a try, I can always fill it in and revert back to the standard set up if it doesn't work.




Rich

(What part of Shetland are you from, Vic...I loved going there, beautiful place)
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Rich

K-157 Vepr. Akula-II (project 971U)
---------------------------------------------------------------

~~~~~~~  "Motorflotes need love too...."  ~~~~~~~

MotorFlote build log : http://www.modelboatmayhem.co.uk/forum/index.php/topic,15222.0.html

Netleyned

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Re: Robbe Sea Jet
« Reply #4 on: January 04, 2014, 08:58:18 AM »

Just watch for propeller torque with a single prop
They are quite unstable at rest but the twin props
steady it up at speed.
Opening the throttle quickly on a single prop
might induce a roll. Especially if you fit anything
like a gantry on it.
Just a thought Rich.

Ned
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U-33

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Re: Robbe Sea Jet
« Reply #5 on: January 04, 2014, 09:05:05 AM »

Thought much appreciated, Ned...been there and done that with torque roll, my little Kilo used to take off sideways due to the torque roll. It always reminded me of a dying fish...


Like I said, I'll give it a try and see what happens, converting it back to standard wouldn't take that much work to do if it turns out to be a complete disaster.


Rich




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Rich

K-157 Vepr. Akula-II (project 971U)
---------------------------------------------------------------

~~~~~~~  "Motorflotes need love too...."  ~~~~~~~

MotorFlote build log : http://www.modelboatmayhem.co.uk/forum/index.php/topic,15222.0.html
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