Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

The Regular Stuff: Chat, Buy, Sell, Off Topic, etc. => General Discussion - Scale Model Gas Engines - Hit & Miss - Throttle Governed - Non-Compression – etc => Topic started by: JinMachine on September 10, 2019, 12:41:34 am

Title: Re: hit and miss Boat N91
Post by: america12mj on September 29, 2019, 07:41:43 am: Quote from: JinMachine on September 10, 2019, 09:59:15 am
Quote from: Hero on September 10, 2019, 09:23:32 am
Powerful-looking little thing. Does it have throttle control or does it just run full-bore in either direction?
It have throttle control.Jin

hello Jin do you explain your throttle control.
my m91 work well now
thank in advance
pascal
Title: Re: hit and miss Boat N91
Post by: Raphael on September 12, 2019, 01:55:58 am: Bonjour,
Example J'in's of variable pitch propeller:
https://www.youtube.com/watch?v=WNtaZcQYGeQ
Title: Re: hit and miss Boat N91
Post by: JinMachine on September 11, 2019, 06:40:46 pm: Quote from: SlowArrow on September 11, 2019, 02:21:50 pm
Quote from: crazydoug on September 11, 2019, 01:35:50 pm
Love the boat, but did see it going backwards!! How did you do that?
crazydoug

I think I read someplace that he has a controllable pitch propeller.
Yes,Jin
Title: Re: hit and miss Boat N91
Post by: SlowArrow on September 11, 2019, 02:21:50 pm: Quote from: crazydoug on September 11, 2019, 01:35:50 pm
Love the boat, but did see it going backwards!! How did you do that?
crazydoug

I think I read someplace that he has a controllable pitch propeller.
Title: Re: hit and miss Boat N91
Post by: crazydoug on September 11, 2019, 01:35:50 pm: Love the boat, but did see it going backwards!! How did you do that?
crazydoug
Title: Re: hit and miss Boat N91
Post by: txlabman on September 11, 2019, 10:05:00 am: I really like the boat Jin!

Thanks for posting the video.
Title: Re: hit and miss Boat N91
Post by: SeeSteam on September 10, 2019, 10:41:33 pm: Slow Arrow, that's fascinating.
Jim, cool boat. I hope someone makes a prairie tractor from one of Jin's engines.
Title: Re: hit and miss Boat N91
Post by: Raphael on September 10, 2019, 03:46:22 pm: Bonjour Mike,
I fully agree with you, our speed steam boats with displacement hulls are 1n30 - 1,40 meter long.
https://www.youtube.com/watch?v=7gop87_pjNE
To avoid this wave phenomenon, I plan to make a planing hull like on an offshore, already done in the past :
https://www.youtube.com/watch?v=76FCX153mys
Title: Re: hit and miss Boat N91
Post by: SlowArrow on September 10, 2019, 03:22:41 pm: I love that video! I was struck by how well that smooth water shows the "hull speed" or maximum speed of a displacement hull. The Hull Speed limit is the result of the drag caused by the wave created by the hull moving through the water. The wave (peak to peak) gets longer the faster the hull moves. When the length of the wave equals the length of the hull at the waterline - that is as fast as you can go (unless you get on top of the water and "plane"). You can calculate that speed in Knots by multiplying the square root of the hull length at the waterline (in feet) by 1.34.

Sorry - just too many memories of the naval architecture classes popped into my head while watching that. 8)
Title: Re: hit and miss Boat N91
Post by: classixs on September 10, 2019, 10:28:45 am: So cool (https://emoji.tapatalk-cdn.com/emoji7.png)

Well done Jin !!!
Title: Re: hit and miss Boat N91
Post by: JinMachine on September 10, 2019, 09:59:15 am: Quote from: Hero on September 10, 2019, 09:23:32 am
Powerful-looking little thing. Does it have throttle control or does it just run full-bore in either direction?
It have throttle control.Jin
Title: Re: hit and miss Boat N91
Post by: Hero on September 10, 2019, 09:23:32 am: Powerful-looking little thing. Does it have throttle control or does it just run full-bore in either direction?
Title: Re: hit and miss Boat N91
Post by: Raphael on September 10, 2019, 01:52:45 am: Bonjour JIn,
Great boat !
Title: Re: hit and miss Boat N91
Post by: Nick on September 10, 2019, 12:46:01 am: Moves along pretty good, you're having fun! :)
Title: hit and miss Boat N91
Post by: JinMachine on September 10, 2019, 12:41:34 am: https://youtu.be/oLtncfm9lMs