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Author Topic: EVER WONDER ABOUT ENGINE SIZES?????  (Read 3425 times)

Offline Robert Zambelli

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EVER WONDER ABOUT ENGINE SIZES?????
« on: September 12, 2018, 07:39:13 AM »
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

Offline john e. holliday

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Re: EVER WONDER ABOUT ENGINE SIZES?????
« Reply #1 on: September 12, 2018, 09:02:34 AM »
I think OK Cub had the most variety.  A lot of fun planes built around those engines. D>K
John E. "DOC" Holliday
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Offline RandySmith

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Re: EVER WONDER ABOUT ENGINE SIZES?????
« Reply #2 on: September 12, 2018, 09:33:56 AM »
You forgot  the  .18 , 39, 44, 55 , 61, 67, 75 , 77,  81, 82   etc...    ;D ;D ;D ;D ;D

Randy

Offline Bill Ervin

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Re: EVER WONDER ABOUT ENGINE SIZES?????
« Reply #3 on: September 12, 2018, 11:14:43 AM »
Don’t forget the zero displacement engine discussed in MA back in the 70’s.  Produced by L.M. Cox. ;)

Offline bill bischoff

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Re: EVER WONDER ABOUT ENGINE SIZES?????
« Reply #4 on: September 12, 2018, 12:36:04 PM »
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.

Offline Tim Wescott

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Re: EVER WONDER ABOUT ENGINE SIZES?????
« Reply #5 on: September 12, 2018, 01:02:00 PM »
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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Offline Bill Ervin

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Re: EVER WONDER ABOUT ENGINE SIZES?????
« Reply #6 on: September 12, 2018, 01:44:14 PM »
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.
« Last Edit: September 13, 2018, 08:40:34 AM by Bill Ervin »

Offline Robert Zambelli

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Re: EVER WONDER ABOUT ENGINE SIZES?????
« Reply #7 on: September 12, 2018, 02:42:47 PM »
Also the Fox .199 big block.

Hi, MM.
I'm not familiar with that particular Fox.
Photo?

Bob Z.

Offline dale gleason

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Re: EVER WONDER ABOUT ENGINE SIZES?????
« Reply #8 on: September 12, 2018, 03:13:40 PM »
Gilbert 7 and 11? Are these .07 and .11 respectively?

dg

Offline Robert Zambelli

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Re: EVER WONDER ABOUT ENGINE SIZES?????
« Reply #9 on: September 12, 2018, 04:02:15 PM »
Hi, Dale - yes, I'm pretty sure they are as you stated.
Bob Z.

Online Mike Scholtes

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Re: EVER WONDER ABOUT ENGINE SIZES?????
« Reply #10 on: September 12, 2018, 05:01:06 PM »
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.

Offline Peter Grabenstein

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Re: EVER WONDER ABOUT ENGINE SIZES?????
« Reply #11 on: September 13, 2018, 05:56:45 AM »
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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Offline Jim Carter

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Re: EVER WONDER ABOUT ENGINE SIZES?????
« Reply #12 on: September 13, 2018, 08:32:38 AM »
 :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  :'(!

Offline Manuel Cortes

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Re: EVER WONDER ABOUT ENGINE SIZES?????
« Reply #13 on: September 13, 2018, 11:07:28 AM »
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.


Offline phil c

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Re: EVER WONDER ABOUT ENGINE SIZES?????
« Reply #14 on: September 13, 2018, 07:10:05 PM »
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.

phil Cartier

Offline Norm Furutani

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Re: EVER WONDER ABOUT ENGINE SIZES?????
« Reply #15 on: September 13, 2018, 08:47:20 PM »
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

Offline phil c

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Re: EVER WONDER ABOUT ENGINE SIZES?????
« Reply #16 on: September 19, 2018, 06:50:06 PM »
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.
phil Cartier

Offline proparc

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Re: EVER WONDER ABOUT ENGINE SIZES?????
« Reply #17 on: November 13, 2018, 07:21:09 PM »
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. #^ #^
Milton "Proparc" Graham

Offline Steve Helmick

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Re: EVER WONDER ABOUT ENGINE SIZES?????
« Reply #18 on: November 13, 2018, 07:31:05 PM »
Nobody mentioned the .76's. I've got three...and two different brands...Jett and Stalker.  S?P Steve
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Offline Chris McMillin

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Re: EVER WONDER ABOUT ENGINE SIZES?????
« Reply #19 on: November 21, 2018, 12:18:52 PM »
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...

Offline Jim Kraft

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Re: EVER WONDER ABOUT ENGINE SIZES?????
« Reply #20 on: November 22, 2018, 07:55:00 AM »
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".
Jim Kraft

Offline proparc

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Re: EVER WONDER ABOUT ENGINE SIZES?????
« Reply #21 on: November 25, 2018, 12:51:42 PM »
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).
Milton "Proparc" Graham

Offline Robert Zambelli

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Re: EVER WONDER ABOUT ENGINE SIZES?????
« Reply #22 on: November 25, 2018, 01:10:02 PM »
What a bunch of GREAT responses!    y1  y1  y1

I had no idea of all the different sizes.

Bob Z.

Offline Robert Zambelli

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Re: EVER WONDER ABOUT ENGINE SIZES?????
« Reply #23 on: November 25, 2018, 01:16:06 PM »
This is the smallest one I have.
.007 c.i.d.
Made by Gustave Zapletal, Czech Republic, # 50 of 50 produced.

Bob Z.


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