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Apr 11, 2015, 11:46 AM
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computermonkey's Avatar
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Rear Exhaust engine over view updated.

Dimensions for engines:
61 RF ABC, Hanno, RF pumped
61 VF

60 XLF-4 AAC, both versions, non and geared pumped

61 R, AR
61R Classic
60 FR

R61 FI RC Short Stroke
R 61 FI RC Long Stroke
NovaRossi 61 Speed/13


61 1033C Red Head Competition long stroke
61 1033RC Black Head Racing long stroke
61 1030 Speed Racing Black Head short stroke

61 M8 RC ringed short stroke
61 M 12LS ABC/ABC ring long stroke


61 R, RLS

Super Tigre X 60 SP RC


Coming just haven't had the time to measure.

Fox 60 FIRE

Post other engine that would fall into the Pattern category. I believe there is a Russian engine but do not know the model. etc.

Credit for starting this goes to another member Speedpanzer.
Last edited by computermonkey; Dec 08, 2020 at 02:47 PM.
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Apr 11, 2015, 01:09 PM
doxilia's Avatar

nice additions!

Say, I wanted to expand this list too so I'm glad you took the initative. I was thinking that it would be good to keep the spreadsheet organized in dimensional blocks by brand, first, and by chronology, second.

In other words, each dimensional block (entered via the horizontal rows) would contain only ONE brand of engines (OS, YS, MVVS, Enya, Webra, Rossi, NovaRossi, etc.). Each column (after the first dimensional column) would then contain a given engine's dimensions which would be sorted chronologically. For example, for OS, we would have:

OS 61 FSR, OS 61 VF, OS 61 SF, OS 61 SF-P, OS 61 RF, OS 61 RF-P, OS 61 FX, OS 55 AX, OS 65 AX, OS 75 AX sorted in columns B through J.

Below that block we would then have the YS engines and so forth. I was thinking it might be a good idea to also sort the engine brands by "continent" or country so to speak so we would have Japanese engines (by popularity) at the top followed by European engines and lastly American engines (as there aren't many). Something like:
  • OS
  • YS
  • Enya
  • Rossi
  • NovaRossi
  • OPS
  • Picco
  • SuperTigre
  • Webra
  • MVVS
  • Moki
  • Irvine
We should probably also go up a tad in point size to say 12 points so the list is easily legible.

I'm happy to do the sorting if you send me your updated list and I'll post both a JPG and the Excel sheet back into the thread when done. Ultimately, we could use one for 40-50 size engines too and another for 25-36 size engines as these are the three "classes" of classics that we fly - mostly.

What do you think?


P.S. I have some measuring calipers (as of Xmas) so I can get accurate measurements of the engines I have if they are not in the list. I don't own any Moki's or Enya's however.
Apr 11, 2015, 02:34 PM
Registered User
Thanks for the effort!
Apr 11, 2015, 04:04 PM
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computermonkey's Avatar
Thread OP
How do you like this lay out?
Last edited by computermonkey; Oct 01, 2015 at 06:53 AM.
Apr 11, 2015, 05:15 PM
Registered User
Great work. Very easy to read!
Apr 11, 2015, 05:16 PM
Classic Pattern Pilot
Speedpanzer's Avatar

List sorting order

You may arrange it in whichever order you like....

When I started this excel spreadsheet it was for the sole purpose to create a quick overview of those rear exhaust engines main dimensions.
If you like to changeover for a given airframe lets say from an OS 61RF to a YS 61AR, it helps to get an idea which kind of modifications will be in front of you.

Apr 11, 2015, 05:20 PM
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computermonkey's Avatar
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I would like to give credit to Dominik for starting this.
Apr 12, 2015, 04:27 AM
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Roguedog's Avatar

I'd like to get a copy of the that spreadsheet. Could you zip it up and upload here?

Here's how OS Max handled the info in their 1986 flyer/poster that they used to include in the box with an engine.
Apr 12, 2015, 07:19 AM
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computermonkey's Avatar
Thread OP
spread sheet zipped
Oct 01, 2015, 06:48 AM
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computermonkey's Avatar
Thread OP
Enya 61 CXL S PRO has been add thanks to cjannelli
Oct 01, 2015, 07:30 AM
Classic Pattern Pilot
Speedpanzer's Avatar


Thanks to all contributing!

I would need to get one of my Novarossis out of its box and measure it, to inculde it as well in this list.

Oct 01, 2015, 07:32 AM
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computermonkey's Avatar
Thread OP
It is in the list.
Oct 01, 2015, 07:43 AM
Classic Pattern Pilot
Speedpanzer's Avatar
I didnīt notice it first glance... even better. Thanks Ralph!
Oct 01, 2015, 08:04 AM
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computermonkey's Avatar
Thread OP
Your welcome
Dec 23, 2016, 10:52 PM
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downunder's Avatar

Irvine 61 RLS

A bit late to the party here but came across this thread while doing a search on the Irvine and seeing I have one NIB I figured a scan of the sheet showing dimensions might be of some help with the spreadsheet. Weight BTW is 553 grams. These are based on the 61R crankcase but use the Q72 crankshaft and rod so the bore obviously is smaller than the 61R. This is similar to the way the 40RLS (got one of them too) is built as it uses the 46 crankshaft and likewise a smaller bore.

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