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UMS Evolution Radial Care and Operation

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UMS Evolution Radial Care and Operation

Old 04-22-2020, 08:51 PM
  #2526  
Hyjinx
 
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Originally Posted by Mein Duff View Post
Good news...and also that they are committed to improving their product !
They look nicer than my older Evo variant also i think. The bell cover and blacked out cylinders make it look a bit more "finished" too I think. Don't know what changed internally but I assume a few now that ums dropped the evolution HH line. Seem to remember reading the cam and carb fwiw Anyhoo,. Adrian is a great guy to distribute for them. He is proactive in his approach, might be good dealing with this mfg. They play hard ball.
Lol
Old 04-22-2020, 09:09 PM
  #2527  
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Originally Posted by clockguypete View Post
The latest UMS gas radial 5&7&9 cylinder engines released on the market last year are now sold under the UMS brand. They redesigned the pushrods to have a deeper capture to prevent throwing a rod as tolerances slightly change during break in. The cam followers are now heat treated to reduce wear. The cylinder heads are machined from a solid billet of aircraft grade aluminum. All engines are shipped with exhaust collector rings installed. The electronic ignition systems are high quality components and designed in collaboration with RcExcell and CH Ignitions.
These new engines are certainly a welcomed improvement over the previous models of several years ago. They range from 55cc through 260cc offering a wider range of options to fit many more model plane sizes. I own one and it runs beautifully!
Hard to overlook on the price point too.
Will to you kindly give more detail on your experience ongoing with the brand? I would like to maybe pick one up used when they start showing up. My next new motor will be a Moki 180, but that's a ways out.
The 55 would be nice for fifth scale bipes. I mounted my Evo 77 on a GP Military PT-17 test bed today. ( Sirius FR-300 down for parts). Sheech not another story, I digress.
The AUW of 12.5 pounds plus motor 6.5 with ring on the Sirius flew it sprite with a 20/10. The 77 will be a little heavy on power and mass. The new 55 would be a great fit on my 1/5 bipe test beds. ( GP Super Stearman, same as the PT -17. 12.5 pound AUW.)
Thanks for chiming in Clock Guy.
Old 04-22-2020, 09:09 PM
  #2528  
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Originally Posted by clockguypete View Post
7cyl 160cc.
Nice!
Old 04-22-2020, 10:31 PM
  #2529  
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I would think a 55 would be more than adequate for a 1/4 bipe....but maybe the wrong diameter to look right on some models.
I run a Seidel 7-70 on my 1/4 Fleet bipe and it's perfect combo..overall a bit heavy but OK.
Old 04-22-2020, 11:12 PM
  #2530  
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Originally Posted by Mein Duff View Post
I would think a 55 would be more than adequate for a 1/4 bipe....but maybe the wrong diameter to look right on some models.
I run a Seidel 7-70 on my 1/4 Fleet bipe and it's perfect combo..overall a bit heavy but OK.
How did you break in that nos 7-70. Your experience really makes me want to put mine on the stand.
I have a really nice busa neupirt 28 to hang radial power on the bench
Was planning on the Evo for it cause it's true quarter scaled but very light.
Threw the Evo to the pt-17 quick just to get up again. So in the interim.
That old German patina Seidel would sure look good on the French bipe!
wouldn't have to be an everyday flyer....
Although it should have a rotary.....
Oh No
Old 05-02-2020, 05:59 PM
  #2531  
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Has anyone mounted the 5 cyl 180cc in a warbird? I'm building a Meister Scale P-47 and this "seems" to be an option. Havent taken any measurements of my cowl just yet but wondering if anyone else has. From what I looked up, it is an inch larger in diameter as compared to the Moki 180. I have been looking for flight videos, reviews of the 180 but havent seen anything yet. If anyone has any video or info it would be greatly appreciated.
Old 05-02-2020, 06:24 PM
  #2532  
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Originally Posted by RCPilot1726 View Post
Has anyone mounted the 5 cyl 180cc in a warbird? I'm building a Meister Scale P-47 and this "seems" to be an option. Havent taken any measurements of my cowl just yet but wondering if anyone else has. From what I looked up, it is an inch larger in diameter as compared to the Moki 180. I have been looking for flight videos, reviews of the 180 but havent seen anything yet. If anyone has any video or info it would be greatly appreciated.
This is a YouTube link of a UMS 5-180 flying demo in a giant scale Yak.
Old 05-03-2020, 07:25 PM
  #2533  
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Thanks, just saw that.
Old 08-01-2020, 08:33 PM
  #2534  
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Default UMS 9-115 Ziroli 87” Stearman

Does anyone know of a modeler using this combination?
this Ziroli Stearman is commonly built at a flying weight of 35#. The UMS has an output of 7.6 hp, swings a 24/10 at 6000 rpm to produce 12.5 kg/ 27.6# of thrust, and weighs 7.7#.
the diameter is 10.2”.
i would be most interested in flying in a scale manner. Having more power than needed could be handy but I would most likely be flying about at 1/2 to 3/4 throttle. I don’t want the plane/ engine combo to look ridiculous.
Do you fellows think it would be too much for this plane?

Old 08-01-2020, 09:31 PM
  #2535  
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Originally Posted by OldBill View Post
Does anyone know of a modeler using this combination?
this Ziroli Stearman is commonly built at a flying weight of 35#. The UMS has an output of 7.6 hp, swings a 24/10 at 6000 rpm to produce 12.5 kg/ 27.6# of thrust, and weighs 7.7#.
the diameter is 10.2”.
i would be most interested in flying in a scale manner. Having more power than needed could be handy but I would most likely be flying about at 1/2 to 3/4 throttle. I don’t want the plane/ engine combo to look ridiculous.
Do you fellows think it would be too much for this plane?
Several years ago I saw a modeler flying that plane/engine combination when it was under evolution brand, and it flew well! I believe you made the right choice for scale power. I would not go smaller in thrust, if anything the UMS 5-125cc would be my other consideration. Stearmans did run a 7cylinder though, but I don’t see a 7 available in your requested power range.
Old 08-02-2020, 03:23 AM
  #2536  
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I fly my Flair Stearman on 1/3rd throttle with the Evolution 7-77.It has an 89” wingspan and I never weighed it.
Old 08-02-2020, 05:08 AM
  #2537  
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Default The Ziroli is a bit more “portly” than the Flair

I have read that the Flair kit could be built as lightly as 25#. I will be following the Ziroli plan very closely. There will be very little modification unless I build it as a Super. It would look better this way with a 9 as far as scale goes but it would be a little under powered for the weight.
I should just build it out as a Super in the colors I would choose if I had my own.
that way it would look right but appear to be flown by a timid Super owner lol.
i cannot afford an alternative power plant unless I went with the 5 cyl 125. It would definitely improve performance but I would rather not have the 5. I wouldn’t cowl it. Maybe a “Townsend” (sp) ring.
oh! I could end up with the 5.
I can build out the wings and tail before I commit anyway. Even cover and paint them. I have been out of the hobby a very long while.
either way, they are pretty toys. “ But honey! I must have a radial for this project. It just won’t work out any other way! We will get through this together like we always have. Come, sit down with me. We can push the BUY BUY button together”.
Thank you guys. The finish on your Flair kit looks great!
Old 08-02-2020, 05:13 AM
  #2538  
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Default Townsend ring


Like this?
Old 08-02-2020, 05:34 AM
  #2539  
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@Barzini, Don’t forget the evolution 7-77 was also a glow fueled engine which tends to produce more power than its four stroke gas equivalent.
Old 08-02-2020, 09:29 AM
  #2540  
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Yes,Thats why i used it.Im not flying this plane regularly so glow is fine.
Old 08-02-2020, 10:53 AM
  #2541  
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Originally Posted by barzini View Post
Yes,Thats why i used it.Im not flying this plane regularly so glow is fine.
The point I was trying to make is Old Bill’s Stearman is 10lbs + another 7lbs including engine = 17lbs heavier than your Flair. Your 77cc glow engine flies your 25lb plane just fine, however Old Bill intends to use a gas radial so he needs a larger engine due to the fact it is gas powered, and his plane will weigh in at 43lbs including engine and fuel.
Old 08-02-2020, 02:19 PM
  #2542  
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Default 43# heavyweight

I am hoping it doesn’t exceed 40# but I’m not counting on it 🤔.

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