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.21 with full crank

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Old 02-23-2017, 09:48 AM
  #1  
blvdbuzzard
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Default .21 with full crank

I am looking for a .21-.28 sized engine with a full crank. I need the old style fully threaded crank. Not the ones setup for a collet and clutches.

Is there any of these out there? I have looked on flea bay but have not found one.


Thanks.

Buzz.
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Old 02-23-2017, 10:05 AM
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Originally Posted by blvdbuzzard View Post
I am looking for a .21-.28 sized engine with a full crank. I need the old style fully threaded crank. Not the ones setup for a collet and clutches.

Is there any of these out there? I have looked on flea bay but have not found one.


Thanks.

Buzz.

Look for older (think early 90s and back) marine engines. They often were converted airplane engines and ranged in displacement from .09 up to .32 that have longer cranks with a longer portion that's threaded. In reality, you could just use an airplane engine depending on what your exact purpose is.

Last edited by 1QwkSport2.5r; 02-23-2017 at 10:28 AM. Reason: Added info.
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Old 02-23-2017, 10:23 AM
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I believe OPS make some. Maybe ENYA, hard to tell from the photos.
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Old 02-23-2017, 11:52 AM
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I would like to re-create one of my planes from back in the day. I had an O.S. .21SE, header, tuned pipe in a 20 sized plane. I had the large fins turned down to about 30%. It was an absolute rocket. I was spinning an 8.5x6.5 prop at 23,500 rpm. Was a really good setup. Was wondering if they had any of the long crank .21 engines around.

If not, looks like I will go with a Rossi 21.


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Old 02-23-2017, 12:07 PM
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I have an OS .21 SE-M in an old Graupner Arrow mono hull boat. It runs decent, but is no powerhouse. My main beef with these OS engines is the poorly manufactured Nickel liners. If I had to choose between a Rossi and an OS, I'd take the Rossi every time. A far better engine. I will be swapping my OS out for a Novarossi when my hobby budget permits it. I would try this engine: http://www.novarossidirect.com/RPLUS213FT_p_3275.html
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Old 02-23-2017, 12:29 PM
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I see you understand what I am after.

I was looking at this one with header and pipe.

http://www.novarossidirect.com/RPLUS217FT_p_3276.html

Yes, I would take Rossi and a few other brands over O.S. I was just after a memory. I still have the header and pipe from my old setup on the shelf.


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Old 02-23-2017, 12:52 PM
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Originally Posted by blvdbuzzard View Post
I see you understand what I am after.

I was looking at this one with header and pipe.

http://www.novarossidirect.com/RPLUS217FT_p_3276.html

Yes, I would take Rossi and a few other brands over O.S. I was just after a memory. I still have the header and pipe from my old setup on the shelf.


Buzz.
I linked to the 3-port engine and meant to link to the one you posted - the 7-port. The latter will favor rpm more than the 3-port engine. I would go with the one you were looking at and not bat an eye. Novarossi makes fantastic engines.
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Old 02-23-2017, 11:59 PM
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I found one in China, the new one is $ 45
https://item.taobao.com/item.htm?spm...cket=15#detail

secondhand(old)is $5
https://2.taobao.com/item.htm?id=543...cket=15#detail
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Old 02-24-2017, 03:56 AM
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Originally Posted by Xiaodong Zhu View Post
I don't believe those cranks are what is being sought (or rather a whole engine). The OP referred to the OS .21 SE engines which were used in cars, boats, and planes. They have a long threaded crank like airplane engines have, not the short threaded cranks similar to what is used in modern RC car engines.
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Old 02-24-2017, 08:45 AM
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Correct. it was the high RPM version of the O.S. 21 sized engines. It used the same case for the airplane, car, boat engines. it had different bearings, timing setup of a tuned pipe. I need to put a drive washer, spinner and prop nut on it.

Thank you for looking, I do appreciate the effort in helping.

The old O.S. .12SE engine had a crank that looked like this one.

http://www3.towerhobbies.com/cgi-bin...?&I=LXBJRH&P=7



In looking, I did found a Super Tigre .28 engine with a threaded crank, it looks like this one.

http://www3.towerhobbies.com/cgi-bin...?&I=LXZUH4&P=0



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Old 02-24-2017, 05:14 PM
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Xiaodong Zhu
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Hope to be useful to you, or you can provide more detailed data that I can help you find.
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Old 02-24-2017, 05:26 PM
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OS23402000 O.S 32 SX-H Crankshaft $ 34
https://item.taobao.com/item.htm?spm...cket=15#detail
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Old 02-25-2017, 10:33 AM
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See how this engine has the threads on the end. I need a complete car engine like that.



https://www.amainhobbies.com/o.s.-.2...m13951/p210574

https://www.amazon.com/Hobbypower-02...%2Bengine&th=1

I did find this one. It may work. I would like a side exhaust though.


https://www.amazon.com/Redcat-Racing...=rc+car+engine


Thank you for the help. If there is a complete engine like the one I posted that is side exhaust?



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Old 02-25-2017, 01:01 PM
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Your intended application is for an airplane, is it not? If so, why seek a car engine? Car engines with a fully threaded crankshafts are quite uncommon these days.
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Old 02-26-2017, 08:48 AM
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Damn, I posted yesterday and it is not here.

Any way. I just wanted to build one like i had in the day. The .25 airplane engines had no where near the power my .21 car motor made in a plane. I would have had to step up to a .45 or so to get that much power in it.

Just trying to relive a dream is all. If I can, I want to. If not, than it will be a Rossi. Either way, this plane is going to go ballistic


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Old 02-26-2017, 09:23 AM
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If money isn't as much of an object, you can have Dub Jett build you an engine. I think his smallest engine is a .25, but he can build it to the specs you supply. Dubjett.com The .35 is a .25 case engine and makes heaps of power. If you opt for the LX setup, it will have higher timing and run faster. You can get it with a tuned muffler that will get you within 500rpm of what a full pipe will do.

The only advantages that a car engine is going to have over an airplane engine is better breathing and higher timing.

Last edited by 1QwkSport2.5r; 02-26-2017 at 09:27 AM.
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