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Author Topic: Bluebird k7 power querry.  (Read 1954 times)

hrobinson35@o2.co.uk

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Bluebird k7 power querry.
« on: November 14, 2010, 02:37:57 PM »

Iv am wanting some idea of what to put into the Touchwood k7 bluebird, ;D
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premiumwoodcraft

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Re: Bluebird k7 power querry.
« Reply #1 on: December 04, 2010, 11:42:01 AM »

Hi
This is quite a challenging model. For scale speed and then some -
suggested is:
540xl brushless motor water cool
battery; 4ah /40c/ 5s1p lipo
semi surface prop with no big  rear planing wedge at rear of model
or
submerged prop under hull - keep the angle shallow!
 try two small wedges at outer edges of hull instead of the big central one - which will cavitate the prop
optional; add a 2inch edf exhausting from jet tube exit &  Y it to the main motor throttle ..  a realistic turbine sound is the result
its alot of gear to cram in so keep it all as light as poss
DO NOT  fit a big edf unless you can get 1:1 thrust for allup model weight as it-ll sound good but wont move much ( trust me i have tried!)

I have dome a few 1/10 K7.. and several 1/6 speedline also

I am currently working on a wren 160 powered 1/6 speedline K7 .. BASED on the great E Lazenby 1/6 - which i now own  :}
I will subsequently be trying one with an aeronaut TF8000 edf and leopard 5692 730kv motor with 12s1p lipo power (26lb thrust)
hope this helps
Chris
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Perkasaman2

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Re: Bluebird k7 power querry.
« Reply #2 on: December 04, 2010, 12:29:04 PM »

Hi Chris, welcome to Mayhem. I'm sure a lot of Mayhemmers, including me would enjoy pix of your projects.  :-))
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flashtwo

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Re: Bluebird k7 power querry.
« Reply #3 on: December 04, 2010, 01:07:37 PM »

Hi Chris,

I've a novel steam jet engine, which I demonstrated on a model boat at Wicksteed last May, and learnt alot about the difference between kinetic energy and momentum.

I've heard the the gas turbine powered boats, using direct thrust of the exhaust, can be dissapointing in their performance compared to when used on the model aircraft. I don't know how true that is, but I understand that the faster the boat goes the more thrust the engine can deliver.

What is your experience in running the gas turbine as a model boat propulsion system and can they be slow to accelerate from stationary?

Ian.
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ooyah/2

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Re: Bluebird k7 power querry.
« Reply #4 on: December 05, 2010, 07:27:23 PM »

Hi Blueray
On thread in Any Other Builds I have described my Touchwood K7 build, I hope that it's of help, if you scroll down there is a you-tube video of K7 running.
If I can be of help just ask.
George.
   
Re: Touchwood 1/12 scale Bluebird K7
Reply #84 on: July 30, 2010, 12:36:44 PM
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ooyah/2

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Re: Bluebird k7 power querry.
« Reply #5 on: December 05, 2010, 07:30:45 PM »

BLUERAY
Here is the link, sorry about that , not too clever with computers.
George

.http://www.modelboatmayhem.co.uk/forum/index.php?topic=4303.50
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