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Convert OS 50SX-H to airplane engine?

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Convert OS 50SX-H to airplane engine?

Old 03-13-2016, 08:46 AM
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JPMacG
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Default Convert OS 50SX-H to airplane engine?

I picked up an OS 50SX-H from a friend for free. I do not fly helicopters. Is it possible to convert it to an airplane engine? Would I need just a prop drive washer? Would I be able to find one that fit?

Thanks,
Jon
Old 03-13-2016, 09:44 AM
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JPMacG
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Ok... Now that I look closer I see that the drive shaft is too short for a propeller. Forget it. Even if a proper drive shaft were available it would make the conversion too expensive.
Old 03-15-2016, 06:08 PM
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Default 50SX Hyper Airplane

I converted the 50sx Hyper to airplane by adding the washer and drive hub and the engine runs great. I am running a 10x7 APC and I use my dremel with a small sanding drum to increase the diameter of the recess in the prop to allow a thin washer and nut to fit with the stock crank. I have run 2 seasons with no issue.

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Old 03-16-2016, 04:08 PM
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JPMacG
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Great! Thanks Dave 1152. What did you do for the drive hub? Did you make your own?
Old 03-17-2016, 03:52 PM
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You need these OS parts:
27708010 Drive hub
27708200 Woodruff key
46120000 Thrust washer
Ebay or Google should find them

Last edited by Dave1152; 03-17-2016 at 03:55 PM.
Old 03-17-2016, 07:50 PM
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You can machine a nut and make a counterbore in the front of the prop too, if the shaft is too short. Different motor but like this one
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Old 03-19-2016, 06:56 AM
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Excellent! Thank you Dave 1152 and aspeed.
Old 03-24-2016, 09:57 AM
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The 50-SX is a good engine.
Old 04-24-2016, 07:04 PM
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This is an excellent engine for airplanes!
Light and powerful. I used it on my UCD-46 and now have it on my Omp Edge -47, an Old 3D kit from OMP for which it is a perfect fit. Two years ago I put new bearings and a new ring into it to bring it back to life. Never ran 30% nitro in it, just 15%.
Old 05-26-2016, 09:38 AM
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Default 55hz-h

The OS 55HZ-H Hyper can be converted for airplane use as well.
I used an old drive washer from a 40FSR (40/46 SF and from the 60FSR will also work): [TABLE="class: partstable"]
[TR]
[TD]OS part number: OSMG5524
[/TD]
[TD]24908009
[/TD]
[TD]Drive Washer .40-.50
[/TD]
[/TR]
[/TABLE]


The crankshaft is very short on this engine. You may use a spinner nut.
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Old 02-09-2017, 12:22 PM
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Hi, what is the inner diameter of the collet ? (diameter of the shaft )

//Rob
Old 02-13-2017, 12:36 PM
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Originally Posted by RobKit View Post
Hi, what is the inner diameter of the collet ? (diameter of the shaft )

//Rob
I just measured the diameter on a OS 40 FSR (I took the parts from one of those).

9,5mm

The 55 HZ-H is busy rightnow: https://youtu.be/vlFz1sDB49A
Old 02-13-2017, 01:14 PM
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Thanks..,,, as I suspected 9,5=3/8inch .. roughly.
GREAT VIDEOs !! Must be fun flying 3D,, have to try that some time.
I am in a conversion project, waiting for my 55HZ-R to arrive, My intention is to
use a 10" prop because a Northstar cant take bigger prop, I just ordered a used propdrive, but I might need to find a new nut aswell some where...//Rob
Old 03-18-2017, 08:38 PM
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you guys beat me to it !

I bought a Worlds Model's P-40 Warhawk just to put a Hyper 50 in it, I bought an extra long Spinner Nut and turned it down on a lathe to mount the Prop, it works, pretty slick..

a 12 inch prop is kind of long for a 57 inch scale War plane, kind of long for a 60 inch scale plane too.. I would not mind going to a 10 inch 3 blade prop, but for the first prop I am going to try an APC 10X10, I am only looking to get around 13,500 RPMs..

also, I am going to use the older OS "silver" sx 50 Heli Head, it's not as large as the Hyper head but is larger than the OS 50 Plane engine head.
I tried to order the Tower's Muffler, but of course Tower is not stalking it any more (too bad for them),

any hoo, it should make for a fun Warbird,,, now what muffler to buy ??

Jim


Last edited by the Wasp; 03-18-2017 at 09:07 PM. Reason: because I like this option, and of course I had to save the world again, so I did
Old 03-19-2017, 01:57 AM
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Originally Posted by Stoneweapon View Post
I just measured the diameter on a OS 40 FSR (I took the parts from one of those).

9,5mm

The 55 HZ-H is busy rightnow: https://youtu.be/vlFz1sDB49A

The 55hz-r is now delivered and converted,, loking at your engine mount !! is it original OS mount ? Is there any issues using the back cover bolts it sems a bit week for my liking, will it be enough ??
//Rob

Last edited by RobKit; 03-19-2017 at 02:01 AM.
Old 03-19-2017, 05:40 AM
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The pylon guys seem to like the backplate mounts. I would think they would be ok if the bolts go into the case far enough. The fins can be turned down on a lathe if the head is too big, or at least hacksaw off the top few fins above the head bolts. I do that to all the car and heli motors. I think I will do the old Supertigers too. They seem to idle too cool.
Old 03-19-2017, 07:38 AM
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Originally Posted by aspeed View Post
The pylon guys seem to like the backplate mounts. I would think they would be ok if the bolts go into the case far enough. The fins can be turned down on a lathe if the head is too big, or at least hacksaw off the top few fins above the head bolts. I do that to all the car and heli motors. I think I will do the old Supertigers too. They seem to idle too cool.

I am going to run the Engine for the first time next week, I am still fiddeling with the engine mount, would love to use the back plate bolts (M3), but as an other modelist said,, "its a risk to take and can be expensive" so its important for me to have it confirmed that there is no issues at all and well proven... I am going to use the Engine in a "Northstar" so there is no issues with the heatsink, I just want to save weight by not using a convensional Engine mount..

I hope my Engine will idle and run fine ;-) //Rob

Last edited by RobKit; 03-19-2017 at 07:47 AM.
Old 03-19-2017, 07:59 AM
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I would NOT use a backplate mounted engine mount unless the engine is designed for it. I have my doubts a helicopter engine crankcase is up to the task. Use a standard glass filled nylon engine mount and be done with it.
Old 03-19-2017, 08:58 AM
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Yes you are probably right, but at the same time people are using it,, I just want to know what their experiance is.. Glass filled nylon is very heavy for my application (100gram+) so I might custom make an aluminium mount instead, or I might just "cut down" a glass filled one.. I think its wise looking for alternatives since there is a lot of weight to be saved.. //Rob
Old 03-19-2017, 10:02 AM
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http://www.darrolcady.com/Accessorie...ies_flight.htm Scroll down about 1/4 of the page for a pic. of the backplate mount for the .40 size motor. A .55 is similar. I don't want to recommend something unsafe, but some of these planes really scream, and go 130 to 200 mph. I think Great Planes or someone carried one too.
Old 03-19-2017, 05:22 PM
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oops, I made a mistake on prop size, I did buy a 10x10 APC, but the plane is not fully built yet and the engine is not mounted, so I am first going to try an 11x8 APC, if the 11 is too long then I will try the 10x10, but I am wondering if the 10x10 wont load the engine enough,, I also have a 40E Carb I am going to use

Jim
Old 03-19-2017, 07:04 PM
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FWIW - a Jett .90LX turns a 10x10 APC at around 16,000rpm on 15% nitro. That's a lot of prop for anything under 10cc.
Old 03-21-2017, 08:32 AM
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Originally Posted by RobKit View Post
The 55hz-r is now delivered and converted,, loking at your engine mount !! is it original OS mount ? Is there any issues using the back cover bolts it sems a bit week for my liking, will it be enough ??
//Rob
As commented in the Video. The mount was taken from a Q500 pylon model "Grand Chelem V2". These backplate mounts are very common in Q500 pylon and fit most standard 40-50 size engines. You may use any after market backplate mount recommended for the OS 46FX or similar engines.

I used screws which are a little longer than the original ones.
Backplate mounts work great if the engine doesn't have super tiny screws on the backplate like some newer Webra competition engines.

Regarding the prop size it depends what kind of exhaust system you use. On the Magic Fun Fly I use a special muffler that supports lower rpm and larger props.
Usually these engines work ok if they are allowed to turn more than 12000rpm.

I converted a normal 50SX-H to wing usage and put a Super Tigre muffler from the ST61 on it with good results. Prop is 10x8 Graupner profi prop. 10x10 may be a little hard to turn without a perfect matching muffler system.

Last edited by Stoneweapon; 03-22-2017 at 10:07 AM.
Old 03-21-2017, 09:04 AM
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Originally Posted by Stoneweapon View Post
. Prop is 10x8 Graupner profi prop. 10x10 may be a little hard to turn without a perfect matching muffler System.

thank you for posting that info !!, it will help

now for a muffler

Jim
Old 03-27-2017, 07:45 AM
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Default Proof of working condition 50SX-H

Yesterday a friend made a short video of the 50SX-H flying in my Jupiter low wing trainer.

https://youtu.be/3ofSmOvtijY I tried several different props but came back to the 10x8 Graupner profi prop (have no rpm since my tacho isn't working).
  • 11x6 Graupner CAM Prop: too much rpm for the prop (much prop noise). good static thrust
  • 11x8 Graupner Grey: slightly too much load. RPM Drops significantly in upwards maneuvres.
  • 10x8 Graupner CAM Prop: loud prop noise. Weaker performance compared to the Profi Prop. Too much rpm for this prop.
  • 10x9 APC (C2): Very silent prop noise. Slightly less RPM. Does not allow the engine to unload rpm in the air (the model may be limiting the airspeed). May be ok as a fuel-saving-prop.

The results can be very different with other exhaust Systems.
What I did not test but may be a good choice is APC 11x6 and 11x7.

I would prefere an old 50SX-H over a new 46FX or 55AX because it is a higher quality engine regarding the carb, case construction and it has a ringed piston which will last forever.

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Last edited by Stoneweapon; 03-27-2017 at 09:13 AM.

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