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Author Topic: os max s .35  (Read 3696 times)

Offline cory colquhoun

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os max s .35
« on: January 20, 2017, 12:57:42 PM »
 picked up second hand os max s .35 with wrap around muffier in ex condition,would it be good for cl stunt and what is good prop

    cory
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Offline Randy Cuberly

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Re: os max s .35
« Reply #1 on: January 20, 2017, 02:22:43 PM »
Quote from: cory colquhoun on January 20, 2017, 12:57:42 PM
picked up second hand os max s .35 with wrap around muffier in ex condition,would it be good for cl stunt and what is good prop

    cory

It's an excellent stunt engine for 500 to550 or so sq in stunt planes weighing in the neighborhood of 38 to 44 oz.

Prop would be any good wood 10-6 or APC 10-5 or 10-6.

This engine needs fuel with good lubrication from Castor and synthetic mix with minimum of 24% total oil.  Standard R/C fuel will destroy it in short order!

Randy Cuberly
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Randy Cuberly
Tucson, AZ

Offline Tim Wescott

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Re: os max s .35
« Reply #2 on: January 20, 2017, 02:37:31 PM »
Quote from: Randy Cuberly on January 20, 2017, 02:22:43 PM
Standard R/C fuel will destroy it in short order!

Been there, done that (with a 25).  On the plus side, once you've ruined them they're very easy to flip -- it's just pointless.
« Last Edit: January 20, 2017, 03:08:28 PM by Tim Wescott »
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AMA 64232

The problem with electric is that once you get the smoke generator and sound system installed, the plane is too heavy.

Offline Motorman

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Re: os max s .35
« Reply #3 on: January 20, 2017, 02:46:37 PM »
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« Last Edit: March 06, 2022, 04:15:45 PM by Motorman »
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Offline Randy Cuberly

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Re: os max s .35
« Reply #4 on: January 20, 2017, 11:16:08 PM »
There is a potential con rod problem but with proper lubrication they usually last for several hundred flights.  If the engine is in good condition and has very good compression I wouldn't worry about it!  This was very much a favored engine for many years in Stunt.

I have two that ran for many hundreds of flights in Noblers.  One did develop a rod problem and the rod was replaced with a ST35 rod with some minor fitting.  The ST rod is bushed.  It's a good mod for longevity if you can find a one!  I also have two so configured!

Randy Cuberly
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Randy Cuberly
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Offline Juan Valentin

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Re: os max s .35
« Reply #5 on: January 21, 2017, 08:00:10 AM »
 Hello Randy
                       What mods did you have to do to the ST.35 Rod to fit?  I have a new OS .35S and if I can find an ST.35 Rod would be doing the mod. Is there a source for the ST Rods? I have a couple of ST.35 that would benefit from new rods. I took the backplate of my engine and the rod has an oiling hole but no brass bushing. The OS.35 Combat specials were that way too.
                                                                                                      Juan
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Offline cory colquhoun

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Re: os max s .35
« Reply #6 on: January 21, 2017, 01:17:32 PM »
Quote from: Randy Cuberly on January 20, 2017, 11:16:08 PM
There is a potential con rod problem but with proper lubrication they usually last for several hundred flights.  If the engine is in good condition and has very good compression I wouldn't worry about it!  This was very much a favored engine for many years in Stunt.

I have two that ran for many hundreds of flights in Noblers.  One did develop a rod problem and the rod was replaced with a ST35 rod with some minor fitting.  The ST rod is bushed.  It's a good mod for longevity if you can find a one!  I also have two so configured!

Randy Cuberly
there is a bit of play in the shaft with no prop on it but once you install prop and nip nut virtually nothing,paid $60 bucks for it  ,i was actually thinking of building nobbler for it as i have gieske plans,but i think i will do it with profile fuse
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Offline Garf

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Re: os max s .35
« Reply #7 on: January 21, 2017, 04:05:22 PM »
The Nobler is perfect for that engine. I mix my own fuel with either 15% castor and 5% synthetic oil or 20% straight castor oil. With straight castor, it will eventually varnish up especially with a muffler. 5% nitro is usually enough unless you are at high altitude.
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Offline Motorman

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Re: os max s .35
« Reply #8 on: January 21, 2017, 04:19:42 PM »
blank
« Last Edit: March 06, 2022, 04:14:13 PM by Motorman »
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Offline cory colquhoun

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Re: os max s .35
« Reply #9 on: January 21, 2017, 04:56:23 PM »
Quote from: Motorman on January 21, 2017, 04:19:42 PM
You don't need a Tiger rod. Go over to Stuka stunt and talk to Leonard Neumann, he makes an after market rod for that engine for about $15.

MM
good to know thanks for the tip keen to get it in a plane runs fine on bench
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Offline Air Ministry .

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Re: os max s .35
« Reply #10 on: January 21, 2017, 06:59:30 PM »
Think Newman 7 Big Art / do a Nylon T up the big end there , to hold rod fwd.



Stops it walking, also a ' X ' relief in front face , for oil retention against crank web .

A SS threadf on it , somewhere .

http://www.clstunt.com/htdocs/dc/dcboard.php?az=show_topic&forum=103&topic_id=114032 ?

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Offline Juan Valentin

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Re: os max s .35
« Reply #11 on: January 21, 2017, 11:25:31 PM »
Hello Motorman and Matt
                                         Gentelman I truly appreciate your help, I sent leonard a message asking for the rod and price.
                                     
                                                                                                                                                                   Juan
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