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Author Topic: Ringmaster with a OS.25  (Read 4129 times)

Offline James Holford

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Ringmaster with a OS.25
« on: July 22, 2016, 10:51:22 PM »
Well I may be acquiring a OS.25 FP.....

 How does it make the Ringaster S1 perform in comparison to the OS.25 LA?   as good? better? Not worth it?
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Jamie Holford
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Offline Clint Ormosen

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Re: Ringmaster with a OS.25
« Reply #1 on: July 23, 2016, 12:06:42 AM »
The LA is probably a steadier runner. Don't bother trying the FP. There's no advantage.
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Offline Perry Rose

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Re: Ringmaster with a OS.25
« Reply #2 on: July 23, 2016, 05:31:33 AM »
If it's around 25 ounces it will perform well.
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Offline Motorman

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Re: Ringmaster with a OS.25
« Reply #3 on: July 23, 2016, 08:01:06 AM »
I was looking at OS Max S 25 for an S1 Ringmaster. I think any one of the three would do good. I'd like to find out if the older engines are heavier.

MM
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Offline James Holford

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Re: Ringmaster with a OS.25
« Reply #4 on: July 23, 2016, 08:52:43 AM »
So basically..... The LA is the one to try to find then
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Jamie Holford
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Offline Motorman

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Re: Ringmaster with a OS.25
« Reply #5 on: July 23, 2016, 09:09:32 AM »
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Online Dan McEntee

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Re: Ringmaster with a OS.25
« Reply #6 on: July 23, 2016, 09:12:44 AM »
   I flew an OS LA.25 on my Primary Force for a couple of seasons, and then switched to the FP.25 just to compare them and get some experience with the engine. In my two examples, I think the FP.25 had just  a very slight edge on power. The Primary Force is a bigger/heavier model, so either will fly a Ringmaster with ease. I ran both with a 10-4 APC. I have an S-1 Ringmaster with a LA.25 on it with this same prop. I think it offers better line tension than a 9 inch prop which some prefer. Best thing to do is fly them both and then decide which to keep.
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Offline James Holford

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Re: Ringmaster with a OS.25
« Reply #7 on: July 23, 2016, 10:03:17 AM »
The good thing about this FP is that it was on a r/c trainer for a short time and then removed for being too small for the plane..and has been sitting since.  Has great compression and has a Muffler should I consider putting it on... all for $35 shipped :)
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Offline Pat Chewning

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Re: Ringmaster with a OS.25
« Reply #8 on: July 23, 2016, 10:21:43 AM »
Quote from: James Holford on July 23, 2016, 10:03:17 AM
The good thing about this FP is that it was on a r/c trainer for a short time and then removed for being too small for the plane..and has been sitting since.  Has great compression and has a Muffler should I consider putting it on... all for $35 shipped :)

A used FP 25  for $35 is ideal for a Ringmaster.  That's exactly what I have and I would certainly recommend it. 
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Offline James Holford

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Re:
« Reply #9 on: July 23, 2016, 10:22:23 AM »
Good to know!
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Jamie Holford
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Offline James Holford

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Re: Ringmaster with a OS.25
« Reply #10 on: July 23, 2016, 10:34:13 AM »
Went ahead and bought.  1 step closer to flying!
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Jamie Holford
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Offline Motorman

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Re: Ringmaster with a OS.25
« Reply #11 on: July 23, 2016, 11:31:09 AM »
Did the early FP have iron piston or were they all ABN?


MM
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Online Dan McEntee

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Re: Ringmaster with a OS.25
« Reply #12 on: July 23, 2016, 11:37:19 AM »
Quote from: James Holford on July 23, 2016, 10:34:13 AM
Went ahead and bought.  1 step closer to flying!

    Go the extra step and get a proper venturii and needle valve for it, preferably OS units. They are out there and available. You could do the 'lock the throttle " thing but you will get more predictable, consistent runs with the proper venturi set up. Play with the props you have but it won't like 5 inch pitch on 10 inch props. Like Brett Buck says, let it run where it wants to and tune everything else to it.
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Offline James Holford

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Re:
« Reply #13 on: July 23, 2016, 11:38:25 AM »
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Jamie Holford
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Offline Phil Spillman

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Re: Ringmaster with a OS.25
« Reply #14 on: July 24, 2016, 07:12:01 PM »
The picture is of an iron piston set up and in many circles, including my own experience, this is a preferred engine! You got the good one! I've run 9 X 4's, 10 X 4's, 9 X 5's wood and composite and the very best is the one YOU like the most! The iron piston versions should receive more oil for longer lives. I suggest you go with about a 25% total oil ration weighted more toward the castor oil side. A good mix an old friend and i settled on was 7% Nitro, 22% Castor oil and 3% Synthetic. just from my own experience with these combinations! This blend works quite well in the warmer months. I also support the the standard venturi needle valve assembly suggestion. Jim Lee of this forum could make one for you as well as many others who own laths.

 Where do you live and fly?

Phil Spillman
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Offline James Holford

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Re:
« Reply #15 on: July 24, 2016, 08:03:07 PM »
Thanks for the repose Phil!!

 Hearing that about the engine certainly brings my mind at ease!

 South Central Louisiana
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Jamie Holford
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Offline Phil Spillman

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Re: Ringmaster with a OS.25
« Reply #16 on: July 25, 2016, 06:44:10 PM »
Hi Jim, Happy to have helped! Especially since you live down there where heat and humidity is a constant factor, I am quite confident that that fuel blend will be adequate for the climate where you fly! As of this week your temperatures more than likely aren't any more uncomfortable than what we're getting in Williamsburg, VA right now! I had wanted to go flying yesterday but the heat index was over 110! That's down right nasty so I stayed in the AC all day and worked in my shop! Now working outside all day today ...that was a really tough duty!

Phil Spillman
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Offline Tim Wescott

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Re: Ringmaster with a OS.25
« Reply #17 on: July 25, 2016, 06:48:57 PM »
Quote from: Motorman on July 23, 2016, 08:01:06 AM
I was looking at OS Max S 25 for an S1 Ringmaster. I think any one of the three would do good. I'd like to find out if the older engines are heavier.

Way less power than the 20FP, but lighter.  I prefer the 20FP.
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Offline James Holford

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Re: Ringmaster with a OS.25
« Reply #18 on: July 28, 2016, 04:23:55 AM »
New to me OS 25 FP arrived yesterday and it practically looks brand new.. Compression is super strong. Not a fan of the big muffler so I may look into a tongue muffler later on.
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Offline Mark Scarborough

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Re: Ringmaster with a OS.25
« Reply #19 on: July 28, 2016, 07:57:13 AM »
Quote from: James Holford on July 28, 2016, 04:23:55 AM
New to me OS 25 FP arrived yesterday and it practically looks brand new.. Compression is super strong. Not a fan of the big muffler so I may look into a tongue muffler later on.
Please look on here for the "BBTU"
or the Brett Buck Tune Up

the stock muffler is part of the equation to make the engine perform, as is a 9x4 APC prop
I am not sure that I agree with the listed fuel selection either, I would refer to the BBTU instructions,
in fact Tim Westcott probably has a link to all the threads with it because he played in that arena
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Offline James Holford

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Re:
« Reply #20 on: July 28, 2016, 07:57:53 AM »
Sweet thanks for the heads up
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Jamie Holford
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Offline James Holford

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Re:
« Reply #21 on: July 29, 2016, 05:40:39 AM »
Snatched up a brand new OS Venturi on Ebay for 10 bones..  Now the search for a NVA!!!!
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Jamie Holford
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Offline Motorman

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Re: Ringmaster with a OS.25
« Reply #22 on: July 29, 2016, 07:40:05 AM »
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Online Brett Buck

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Re: Ringmaster with a OS.25
« Reply #23 on: July 29, 2016, 08:03:33 AM »
The only issue I foresee is that the 25FP, running properly, will turn the Ringmaster into a decent B Team Racer. We got about 4.2 second laps with a Veco 19 and 3.8 with a 20FP.    I would expect something in the 3.5 second range with a 9-4. I have flown a Ringmaster that fast, and things moved along pretty quick.

     Brett
« Last Edit: July 29, 2016, 08:35:03 AM by Brett Buck »
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Offline Motorman

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Re: Ringmaster with a OS.25
« Reply #24 on: July 29, 2016, 09:54:12 AM »
What do you put on an S1 Ringmaster? I have a Veco .19 that runs in a sloppy wet 2/4 stroke and breaks rich or lean where ever it wants but doesn't matter because it has plenty of power everywhere and grunts through the old time pattern quite nicely. Don't know if that's running properly but I'm very happy with it.

MM
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Offline James Holford

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Re: Re: Ringmaster with a OS.25
« Reply #25 on: July 29, 2016, 10:30:38 AM »
Quote from: Brett Buck on July 29, 2016, 08:03:33 AM
The only issue I foresee is that the 25FP, running properly, will turn the Ringmaster into a decent B Team Racer. We got about 4.2 second laps with a Veco 19 and 3.8 with a 20FP.    I would expect something in the 3.5 second range with a 9-4. I have flown a Ringmaster that fast, and things moved along pretty quick.

     Brett
So would a bigger prop slow it down some?  Last thing I need is to get super dizzy quik lol
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Jamie Holford
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Offline James Holford

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Re: Re: Ringmaster with a OS.25
« Reply #26 on: July 29, 2016, 10:34:41 AM »
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Jamie Holford
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