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General control line discussion => Open Forum => Topic started by: Robert Zambelli on September 12, 2018, 07:39:13 AM
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I may have posted this before but it still interests me! y1 y1
While looking over a few engines I’ve accumulated over the years, I became curious about how many different sizes were made, so I looked at some websites and magazine advertisements – I was really surprised! ~^ ~^
Here are some, starting with a little Diesel: (all in C.I.D.)
.009, .010, .020, .024, .039, .045, .049, .051, .06, .061, .074, .075, .09, .098, .099
.10, .11, .12, .14, .15, .19, .20, .201, .21, .23, .25, .26, .28, .29, .30, .31, .32, .33,
.34, .35, .36, .40, .45, .46, .48, .49, .50, .51, .52, .53 .56, .59, .60, .65, .70, .72 .74, .99, 1.08,
etc, etc,-----------. I’m sure there are many more out there but what really got me thinking is: WHY????? Could there possibly be some rationale? Granted, that for classification/competition, there are definite limits but what about all the “in-betweens”?
A topic for discussion/conjecture?
Bob Z
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I think OK Cub had the most variety. A lot of fun planes built around those engines. D>K
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You forgot the .18 , 39, 44, 55 , 61, 67, 75 , 77, 81, 82 etc... ;D ;D ;D ;D ;D
Randy
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Don’t forget the zero displacement engine discussed in MA back in the 70’s. Produced by L.M. Cox. ;)
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I'm sure a lot of it is marketing. For example, back in the '80's, small nitro heli's used a .21. This became a .25, then .28,.32,.35. All had the same footprint and would interchange. Then it got silly with .37 and .39. Hey, this .37 is better than the other guy's .36. Yeah, well our .39 is two better than your .37! Ad infinitum...Also, how many sizes that we would consider "odd" are nice round numbers in metric? And the Fox .78? Simple. 1" bore, 1" stroke.
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For sport engines it's probably just manufacturer's whim, whatever they thought would sell, or whatever worked out to nice round numbers (an 0.33 is 3/4" bore & stroke, a 0.19 is 5/8", 0.09 is 1/2", .061 is 1cc, .18 is 3cc, etc.)
For teeny engines, it's what can actually be made to run -- I think .01 cu-inch is about as small as you can get reliably.
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For sport engines it's probably just manufacturer's whim, whatever they thought would sell
I’ve heard that every time Mr. Garofali finished a bottle of wine a new Super Tigre engine design was born.
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Also the Fox .199 big block.
Hi, MM.
I'm not familiar with that particular Fox.
Photo?
Bob Z.
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Gilbert 7 and 11? Are these .07 and .11 respectively?
dg
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Hi, Dale - yes, I'm pretty sure they are as you stated.
Bob Z.
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I saw a line of tiny diesels made in Europe as small as .0010 (not a typo) IIRC, maybe even smaller. Some Gasparin CO2 engines are in that range, I have one in a tiny FF.
Add the OK Cub .149 to the list. Also Saito .62 4-stroke.
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I've heard that every time Mr. Garofoli finished a bottle of wine a new Super Tigre engine design was born.
Yep,..... and one of Mr. Garofali´s BIGGEST CATCH was his Super Tigre G .15 FI .
Back in the seventies I converted mine into Diesel for Combat.
GREAT RUNNERS lots of Power and torque.
Very close to Rossi Diesel those days.
H^^
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:o ;D Wow! Thanks for opening this thought/line of thinking! In all the years I've enjoyed this sport, I don't think I've ever given consideration to all of the various sizes. I've read about many of the myriad manufacturers and their various lines but not necessarily in the context of all the myriad sizes produced (without regard to manufacturer). That would be quite a collection, wouldn't it :D! Oh, to have just one of each size in a suitable display :)!! What a wonderful vision that brings to mind ;D ;)!! Oh well, I doubt, I'll live long enough to see that :'(!
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Hi all.
I think Leo made a .37
For sure (I have all of them) Raduga, Talka and Stalker made a .42
Stalker made a .55 too
Kind regards from Spain.
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Here are some, starting with a little Diesel: (all in C.I.D.) and a maybe why?
.009, ???? tooling?
.010, .020, .024, .039, .045 tooling, power, .010 was the hottest engine of any size by hp/cu.in. for quite awhile
.049, .051, Free flight classes, .06 ????
.061, 1cc
.074, .075, .09, .098, .099, .10, sport power
.11, .12 probably cost.
.14 Herkimer- who knows???
.15 convenient size, 2.5cc
.19, .201 Free Flight class
.20 sport power
.21, 3.5 cc
.23 O&R ??? a convenient size?
.25, sport power
.26 probably power in a small case
.28 probably power in a small case, sport flying
.29 free flight class
.30, .31 free flight class
.32, .36 two engines in one size case
.33 O&R?? Johnson SS?
.34 Garofoli wanted more power in a 21 case
.35, .8 x .7 bore and stroke Fox Stunt
.36 combat class when some engines came out in slightly off sizes.
.40 more power for sport RC RC Pylon
.45, .46, .48, .49, .50, .51, .52, .53 .56, .59 more and more power
.60, .61 FAI class 10cc
.65, .70, .72 .74, .99, 1.08 power, power, and more power, mostly RC
Just as an aside- it seems when motors were built in different sizes in one case casting the smaller displacements seemed better suited for high rpm, the larger bores better for easy handling
Fox 29-35-40 Supertigre 29-35-40-46 and others.
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Whats puzzled me is the engine classification difference between controline and free flight.
Controline:
Class ˝A: 0000—.0504 cubic inch
Class A: 0505—.1525 cubic inch
Class B: 1526—.3051 cubic inch
Class C: 3052—.4028 cubic inch
Class D: 4029—.6500 cubic inc
Free flight:
Class 1/2A: .000-.0504 Cubic Inch
Class A: .0505-.2000 Cubic Inch
Class B: .201-.300 Cubic Inch
Class C: .301-.400 Cubic Inch
Class D: .401-.670 Cubic Inch
Norm
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The CL rules came after the free flight classes had been established in the US. The FAI went with the 2.5cc*.1525 cubic inch) cut off for speed, so we followed suit.
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The 1.08 is the famous, (I'm serious) O.S. B.X-1 1.08 FSR. I own 2 of them. One is NIB. I had 3 but, I sold it to get a Moki 1.50! And yes, I have 2 of those!! Rich Oliver has got me beat hands down. He owns one of the mythical Thunder Tiger Pumped 1.20s!!
Got to get my funds together to go after those Fox 74 Mark IV's. #^ #^
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Nobody mentioned the .76's. I've got three...and two different brands...Jett and Stalker. S?P Steve
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The 1.08 is the famous, (I'm serious) O.S. B.X-1 1.08 FSR. I own 2 of them. One is NIB. I had 3 but, I sold it to get a Moki 1.50!
I'm with you Milt, on the 1.08's. Dad has several because he and Harry Latshaw built pretty big RC stuff as a matter of course, but I have not only OS but ASP and Magnum versions too and they're all good runners. Love that 15x8 and 14x10 APC prop in them.
Chris...
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Most of us remember when glow engines were not nitro engines. The advertising guru's make up things to sell. To the uninformed, they would think our engines just run on nitro.
Some where along the line an engine manufacturer came up with the idea of using 1/16" ball bearings in a cage for the thrust bearing. Now they had an advertising gimick that did nothing, but no one else had them until everyone else started putting them in their engines just to stay competitive.
I have seen more engines ruined by the races or cages coming apart and destroying pistons and cylinders than from all other reasons. They run just as well with a bushing.
Guess I am getting old. I remember when all engine powered planes were called "GAS MODELS".
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Hi Chris, glad to see you here. How’s that Tipo 750 flying? I also have 2 Thunder Tiger 1.20’s which the RC guys call “the beast”- trust me it is! My Moki 150’s, (yes I have more than 1) are VERY HARD to get because, most of the guys go after the 1.80. I personally think the 1.80’s are inefficient because, they suck more gas than a Ford 5.4 Triton, (yes, I’ve got that too lol).
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What a bunch of GREAT responses! y1 y1 y1
I had no idea of all the different sizes.
Bob Z.
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This is the smallest one I have.
.007 c.i.d.
Made by Gustave Zapletal, Czech Republic, # 50 of 50 produced.
Bob Z.