The most beautiful O.S engines ever made
#226
One of the CX motors lists a single bearing. That is ok too. No one has offered that for many decades. The prices are not shown for all of them. Interesting to see a full lineup of motors. Some look very dated and would be quite slow. Personally, I would spend my $100 ($138 Canadian) on the Novarossi if the rear exhaust would fit at all. http://www.planethobby.com/collectio...ducts/rfx-15tc The ASP blue head .15 is a better deal if you search a bit.
#227
I don't know how the ASP/Magnum blue head compares to the Enya 15CX. I don't know of any stats that would enable you to make that comparison, except that the ASP would certainly be cheaper. Given that the 11CX is a good engine and the 15CX is a bored out version, I have high hopes for the Enya, but hopes is all they are at this point.
I don't know what difference the ball bearings would make in either weight or performance. When OS was making plain bearing engines they were much less powerful than the ball bearing engines, and much lighter, but they differed in so many ways that the type of bearing was the least of it. Enya has made plain and ball bearing versions of what look to be the same engine, but sometimes they also have differences in the crankshaft or the carb. No idea what they did with the new 15CX.
I only saw a plain bearing 15CX on the Enya web page; where did you see the single ball bearing?
Jim
I don't know what difference the ball bearings would make in either weight or performance. When OS was making plain bearing engines they were much less powerful than the ball bearing engines, and much lighter, but they differed in so many ways that the type of bearing was the least of it. Enya has made plain and ball bearing versions of what look to be the same engine, but sometimes they also have differences in the crankshaft or the carb. No idea what they did with the new 15CX.
I only saw a plain bearing 15CX on the Enya web page; where did you see the single ball bearing?
Jim
#228
The SS .15 BB TN says one bearing with no price listed on the previous list. I have no specs on the CX, but have tested a lot of .15s which I seem to accumulate for some reason. I used a 7-5" Master Airscrew prop and 10% fuel. About 18,000 rpm with no muffler. The results are in the engine 'tach readings' section. The ASP was above the LA by a bit.and works quite well. Mine seems to eat plugs. I made a new head which uses turbo plugs, and it compares well to a Fora, Rossi and Piccos of the same size. (20,500 with the head .) I would be interested to see the rpms of the CX to compare to the others that I did. I spent a lot of time doiing those checks on various sizes of motors as well. It seems to always be windy here. Many years ago we raced Goodyear planes with .15s, and there was a plain bearing and ball bearing class. Supertiger had a bronze bushing that would fit in the place of the ball bearing. there was really no difference in rpms. The LA plain bearing engines have a bad rap for low performance, but the carb hole is much smaller as it is meant for beginners who want no problems. The .15 is really quite good considering that. It is also lighter because of a smaller case which does not need to support bearings. (and plastic parts, and less screws on the head which is squared off for less weight too.
Last edited by aspeed; 12-29-2016 at 12:17 PM.
#232
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I don't know how the ASP/Magnum blue head compares to the Enya 15CX. I don't know of any stats that would enable you to make that comparison, except that the ASP would certainly be cheaper. Given that the 11CX is a good engine and the 15CX is a bored out version, I have high hopes for the Enya, but hopes is all they are at this point.
I don't know what difference the ball bearings would make in either weight or performance. When OS was making plain bearing engines they were much less powerful than the ball bearing engines, and much lighter, but they differed in so many ways that the type of bearing was the least of it. Enya has made plain and ball bearing versions of what look to be the same engine, but sometimes they also have differences in the crankshaft or the carb. No idea what they did with the new 15CX.
I only saw a plain bearing 15CX on the Enya web page; where did you see the single ball bearing?
Jim
I don't know what difference the ball bearings would make in either weight or performance. When OS was making plain bearing engines they were much less powerful than the ball bearing engines, and much lighter, but they differed in so many ways that the type of bearing was the least of it. Enya has made plain and ball bearing versions of what look to be the same engine, but sometimes they also have differences in the crankshaft or the carb. No idea what they did with the new 15CX.
I only saw a plain bearing 15CX on the Enya web page; where did you see the single ball bearing?
Jim
Ok so I've never heard the term plain bearing, would somebody be willing to enlighten me?
#233
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The engine has a bronze bushing instead of ball bearings, all other things being equal they will have the same power. After all a turbo charger shaft can turn 100,000+ rpm on an oil film and so can a crankshaft. Note bronze bushing.
Last edited by Hobbsy; 12-29-2016 at 08:04 PM.
#234
A Rossi or Novarossi will put out 1/2 hp better than a .40 GP Thunder Tiger too. The weight is often overrated. It is the plane power to weight ratio that makes the difference. A motor that revs to 30,000 or 40,000 rpm needs to be stronger. Some old Nelsons had the cylinder fly completely off. Plain bearing engines are fine. Look at the Small Block Chevy.
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A Rossi or Novarossi will put out 1/2 hp better than a .40 GP Thunder Tiger too. The weight is often overrated. It is the plane power to weight ratio that makes the difference. A motor that revs to 30,000 or 40,000 rpm needs to be stronger. Some old Nelsons had the cylinder fly completely off. Plain bearing engines are fine. Look at the Small Block Chevy.
#237
I've learned lately that a 12,000rpm engine is considered "high rpm". To me, a high rpm engine is in the 16,000-18,000rpm category. So it's all a matter of perception (and what rpm range the engine is tuned for).
Ill find out in the spring/early summer how much can be had from cutting an LA25 all up. Adding a boost port alone should wake it up a little bit.
Ill find out in the spring/early summer how much can be had from cutting an LA25 all up. Adding a boost port alone should wake it up a little bit.
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I remember the second time I bought that plane, I put the 25fx on it instead, and I did some strengthening work to the fuse, the second or third flight I tore the wing off in flight
#239
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We used to prop Nelson .15's on our QM airplanes for about 27,000 RPM on the ground. 18,000 RPM isn't that high...
Current day .40's on Q40 planes run in the mid to high 20's also. In the air, probably around 28,500 RPM.
F3D .40's are likely up in the low 30's. I don't fly F3D, so I can't comment for sure, but they're hauling.
Of course, no one expects them to last forever, either.
Current day .40's on Q40 planes run in the mid to high 20's also. In the air, probably around 28,500 RPM.
F3D .40's are likely up in the low 30's. I don't fly F3D, so I can't comment for sure, but they're hauling.
Of course, no one expects them to last forever, either.
#243
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The plugs were extra. Each engine comes with a Gold plug like those in the pictures. I was kinda surprised in how much bigger it was than the LA 15. It does weight more also but that is from the plating as most gold plated aluminum needs to be copper plated first. Now that I have them I am thinking I should have just bought a bunch of fuel and LA 15s lol
#247
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Well I never know they had those way back so it would be interesting to know all of the history of OS. The bottom end of the 11 AX looks close to the 15CVA but i never owned one. I do like how the case is billet and I thing it is the first production engine from O.S. with a billet block. Next payday I will order one or two of the standard 11AX engines to fly and run to see how they perform. I am thinking 8x4 at 15,000
#248
#249
https://www.youtube.com/watch?v=yuJwAcD0Efk The collector .11 AX that is being discussed. I did not know of a standard AX .11 being offered. There is a car .12. A billet case is arguably stressed from machining. Sometimes big cuts heat it up too much. It is a good option for small runs. Sometimes the roughest sand castings are the most stable. A motor will distort even while running so it is not really a big deal.