Originally Posted by
clockguypete
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.