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Author Topic: BIG MISTAKE! What an idiot i am!  (Read 8194 times)

BigAde

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Re: BIG MISTAKE! What an idiot i am!
« Reply #25 on: February 14, 2010, 08:28:40 PM »

Well my trip to ASDA could not have gone better! A small plastic pot exactly 74mm and for only 80p. This kortz must have cost me about 3 in total!!!

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captain ron

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Re: BIG MISTAKE! What an idiot i am!
« Reply #26 on: February 14, 2010, 10:56:22 PM »

Fantastic glad you got sortied.Thats what the forums about.we're all here to help.

Ron
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Den the tug

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Re: BIG MISTAKE! What an idiot i am!
« Reply #27 on: February 17, 2010, 05:55:57 PM »

Hey Troops,
Friend of mine made korts out of yoghurt tubs, skined with balsa and sealed.
 Absolutly brilliant, the power produced from the car heater motor to the 70 mm prop beats my twin 850 motors to 40mm ready made props and korts.
Thats the way Ill go next time.
Den :-))
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chrise

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Re: BIG MISTAKE! What an idiot i am!
« Reply #28 on: February 18, 2010, 10:50:21 AM »

Well my trip to ASDA could not have gone better! A small plastic pot exactly 74mm and for only 80p. This kortz must have cost me about 3 in total!!!





Are you planning a bottom bearing & to shorten the nozzle so that it is not quite as vulnerable?
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andywright

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Re: BIG MISTAKE! What an idiot i am!
« Reply #29 on: February 18, 2010, 04:48:45 PM »

Hey Troops,
Friend of mine made korts out of yoghurt tubs, skined with balsa and sealed.
 Absolutly brilliant, the power produced from the car heater motor to the 70 mm prop beats my twin 850 motors to 40mm ready made props and korts.
Thats the way Ill go next time.
Den :-))

Large props are allways more efficient than small props, I used a single 70mm on my Nangee rather than twin 55mm. She steers brilliantly, especially as the Kort is steerable.
Andy
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Navigational Aids vessel Master. Old Conway 70-72

andywright

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Re: BIG MISTAKE! What an idiot i am!
« Reply #30 on: February 18, 2010, 04:55:13 PM »



Are you planning a bottom bearing & to shorten the nozzle so that it is not quite as vulnerable?

There will be less drag on a shorter Kort, both from moving through the water and also from the thrust of the water travelling through the Kort, modern day korts are very short. I would go to half or less. And fit a bottom bearing to stop any vibration, and protect the kort from damage ie being knocked.
http://www.kortpropulsion.com/kort_nozzles_propellers.htm

I the one shown is fixed, but they are all similar.
Andy
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Navigational Aids vessel Master. Old Conway 70-72

BigAde

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Re: BIG MISTAKE! What an idiot i am!
« Reply #31 on: February 20, 2010, 08:23:24 AM »

There will be less drag on a shorter Kort, both from moving through the water and also from the thrust of the water travelling through the Kort, modern day korts are very short. I would go to half or less. And fit a bottom bearing to stop any vibration, and protect the kort from damage ie being knocked.
http://www.kortpropulsion.com/kort_nozzles_propellers.htm

I the one shown is fixed, but they are all similar.
Andy

I was thinking about shortening the kortz, but I will see how it performs first then adjust with a dremmel later!
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