K&B Torpedo 15 Two Speed
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- Опубліковано 25 лип 2018
- A very unique engine and a challenge to run. Omega 5% with added castor, K&B plug, 7x4.5 prop.
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I put this up on RCU and a gentleman, who had owned one responded. He said that one needle was peaked out and the other one was set rich. You switched to the rich needle, with an escapement, when you wanted to slow down.
These had a fuel line pinch off setup in a model. To get two speed, one line (set for high speed) is pinched for low speed and then released as the other one is pinched (set rich) to get high speed. (early version of throttle.) This was done with either a timer setup or an early linear servo with a fuel line pinch setup. these hailed from 1954ish.
Yes. Or with a "Y" or other type valve in line.
Correct, intro date was 1954, same as the competing Fox entries to the market.
I know they made at least one..lol...that was my first engine on my first RC plane (Mambo) in 1957. First radio in the Mambo was a kit put out by ACE....lot of water under the bridge since then....thanks for sharing, sorry it took me this long to find it... Don
Thanks for posting this - I just acquired a few .15s and .19s and didn't know how to control them.
I believe you can reposition the needle valve assembly to the right side opposite the exhaust and try again ! Sounds like it should give a good run ! Keep up the good work !
There are no nuts holding these spraybars in place. It looks like they are pressed in. It isn't my engine and I am not messing with it.
They are pressed in at the factory, the same as on OK Cubs. This is yet another drawbaCK TO THIS PARTICULAR DESIGN.
I’ve seen a lot of K&B Green heads, never seen one with 2 needles. The prop seems small, Back in the day we ran 8x6’s on .15 size engines.
in the series .09, 15, 19, 201, 23, 29 s and 29 R, 35 and 35 combat and 45 stunt and RC and the Rc 45 won a world championship for a few years.
ps David they made a ton of those 15 greenheads won a freeflight championship a few years
You might force a hose over the needle valve (as an extension) so you can adjust out of harms way.
you need an anco motor control to change the speeds
LOL thanks for suffering for us. Very interesting
it's only a 2 speed if you have the anco motor control got a valve like a carb on an R C card and you used an escapement or a servo to move the adjustment arm
Very interesting with a 2-speed needle I've never seen anything like that before I have the same engine not a two speed but a K&B 15 nonetheless that is in very poor condition and almost has no compression left
This is just a guess but I think it might have two different sized spray bars. You would just hook up the fuel to the bar that you wanted to use, that way you could fly your CL plane fast or slow. I would like to see you max it out on the upper only and then the lower bar only to see if it runs at different speeds.
Not going to happen. This engine is packed and ready to ship to the owner.
Too bad. Another possibility is that it runs low speed with one and faster with two.
No, it runs only only one at a time. It used a clapper valve controlled by escapement (Babcock) to shift from one to the other. Stone age RC throttle control.
Maybe that was intended to be a Team race engine with a way to select which needle got fuel. Team racers back in the day were all .15 size.
Actually, in the USA Team Race was all .29s as AMA B Team Race was the only game in town.
can the needle valves be removed and install the other way
No they cannot and I'm not trying. It isn't my engine.
David, do you still have this engine? And, if so, would you consider selling it?
No and it was never my engine to sell anyway. I have sold ALL engines so you are not too up to speed on me or this channel.
You are the only person I have actually ever seen run one of these. Yes, the left hand exhaust is a pain.
Only one needle at a time has fuel running to it, there would have been a valve where you have the t fitting and one line or the other was shut down to give the 2 speed effect- maybe!. These are early 1950s as I recall, Fox made motors with the same set up. Great video.
Thank you John! It was fun and interesting.
Here is the schema of dual nva.
imgbox.com/V59WbD9y
Thank you very much! That is quite interesting.
take out the spray bar and reverse it .i see your not old school.i have over 800 model eng's in my collection and 99% of them are pre 1970