Go Back  RCU Forums > Glow Engines, Gas Engines, Fuel & Mfg Support Forums > Gas Engines
Reload this Page >

UMS Radial Engines. Who's got one and are they any good?

Notices
Gas Engines Questions or comments about gas engines can be posted here

UMS Radial Engines. Who's got one and are they any good?

Old 08-21-2019, 07:25 PM
  #1  
Parkfley1
Thread Starter
 
Join Date: Sep 2017
Posts: 9
Likes: 0
Received 0 Likes on 0 Posts
Default UMS Radial Engines. Who's got one and are they any good?

UMS Radial engines have hit the market. So who's got one and are they any good? In the videos they look and sound great, but nobody that I know in Aus has ordered one yet. Keen to hear from anyone who's seen one in the flesh.
Old 08-29-2019, 12:22 AM
  #2  
Parkfley1
Thread Starter
 
Join Date: Sep 2017
Posts: 9
Likes: 0
Received 0 Likes on 0 Posts
Default

That good hey? I guess I'll hang onto my money and see how they fair in the long term...
Old 01-03-2020, 09:10 PM
  #3  
su27flanker
 
su27flanker's Avatar
 
Join Date: May 2012
Location: New Zealand
Posts: 69
Likes: 0
Received 0 Likes on 0 Posts
Default

Ive been thinking the same thing as ive never seen one and are wanting to know more about them.
they have open rockers so the inside of cowl might get a slight bit of oil but they include the exhaust unlike the saito radials (have to sorce a MRS, keleo etc) and run with less oil vs the saito.

lots of options as you can see in the link below, but the 5-75cc is the one that catches my eye the most for the $$$
UMS Radial Engines : UMS Radial Engines : UMS Radial EnginesFOURTH_SECTION : Austars-Model.com
Old 01-05-2020, 12:56 PM
  #4  
TimD.
My Feedback: (207)
 
TimD.'s Avatar
 
Join Date: Dec 2001
Location: Jacksonville, FL
Posts: 747
Likes: 0
Received 11 Likes on 10 Posts
Default

Well I have a 7-90 and so far, runs Very GOOD! Now I only have {4} 32oz tanks run through it so far and am waiting on the new TopRC Corsair to put it in. I have a 3-blade 22x12 Biela wide blade prop on it and am getting tach readings from 1000-1050rpm at idle to full at 54-5500rpm. Not bad when compared to my Saito 3-90 about the exact same Rpm's with the USM getting 100 more rpm at full throttle.

If it holds the same as my EVO's 7-77 it will be a winner. I have logged ( a guess) 15-20hrs of run time one them. And they are ready for more. Three flying seasons pretty steady.
I might get the 5-125 next. It will fill the gap between my 90's and Moki 180. Price is much more attractive as well.

Last edited by TimD.; 01-05-2020 at 12:59 PM.
Old 01-16-2020, 07:34 PM
  #5  
su27flanker
 
su27flanker's Avatar
 
Join Date: May 2012
Location: New Zealand
Posts: 69
Likes: 0
Received 0 Likes on 0 Posts
Default

how would you compare the motor to the FG-90? i like saito due to beong made in Japan and comes with a 3yr warrently, i like the idea of UMS but i cant find any real videos of planes flying or much info on them so far.
Old 01-18-2020, 07:19 AM
  #6  
TimD.
My Feedback: (207)
 
TimD.'s Avatar
 
Join Date: Dec 2001
Location: Jacksonville, FL
Posts: 747
Likes: 0
Received 11 Likes on 10 Posts
Default

Well they are both made quite well. Good machine work on both. The only real difference between the two are the 3 cylinder and 7clinder. The Saito's 3 cylinder has a more Throaty poping sound from the larger cylinder volume, where the UMS has a constant rumbling from the 7 cylinders. The UMS is quieter than the Saito, I believe it is from the smaller cylinder volume, but sounds more scale to me.
It sips fuel a 24oz tank would be more than enough for a 15-20 min flight.
Old 01-28-2020, 02:42 AM
  #7  
Parkfley1
Thread Starter
 
Join Date: Sep 2017
Posts: 9
Likes: 0
Received 0 Likes on 0 Posts
Default

Well got to see the 5 cylinder 125cc UMS engine up close and running this week. Machining looks good and finish is excellent. From the look of it, every bit as good as a Moki engine. Comes with a factory exhaust ring as standard which is cool and I love the external rockers for ease of maintenance. It's definitely on my list.
Old 01-30-2020, 06:06 PM
  #8  
badangle
Senior Member
My Feedback: (1)
 
Join Date: Feb 2010
Location: springhill, FL
Posts: 187
Likes: 0
Received 0 Likes on 0 Posts
Default UMS radial

There are lots of post on GLOW ENGINES thread about converting there glow radials to gas. I have a 7-77 glow and its not close to moki quality. I have been trying to get it to run correctly for
way too long without success. I swapped carburetor on advice from GLOW ENGINES thread and that helped a bit ...cost $99.00 .....then theres the fuel issue, must blend from normal fuel and methanol
50/50 ...also need to invent your own starter battery to power 7 plugs. If there gas is like there glow, proceed with caution !! My engine runs strong but won't idle without glow power on...
Have to worry about two bottom cylinders getting hydrolic lock....wish I had my money back
Old 04-23-2020, 03:17 PM
  #9  
su27flanker
 
su27flanker's Avatar
 
Join Date: May 2012
Location: New Zealand
Posts: 69
Likes: 0
Received 0 Likes on 0 Posts
Default

Converting those older glow radials is more trouble than its worth to be honest, better to just sell it and buy a gas Saito or UMS radial or continue to run it on glow fuel.

From what I'm seeing the UMS are proving really good and very easy to setup and run, still waiting to see some flight videos.
Old 06-30-2020, 05:39 PM
  #10  
badangle
Senior Member
My Feedback: (1)
 
Join Date: Feb 2010
Location: springhill, FL
Posts: 187
Likes: 0
Received 0 Likes on 0 Posts
Default

You won't find many videos because flying a costly and unreliable engine is a bad combo in a plane that's costly too....
I had 7-77 glow......selling it was best thing . yes there pretty but QUALITY and reliable. ..no
4 strokes hard enough to keep glow plug hot but 7 cylinders ...firing every other cylinder...piston going up and down...= cold glow plug.
Then u have to worry about oil in bottom cylinders causing lock up.
Also big pain to adjust valves....lube up after using or rust...crappy pushrod / rocker design, heck pushrod so loose its a joke...
I read forum on this engine on this web site and nothing but good to say UNTIL someone put different carbon on....
Then all of a sudden the "expert" clamed the carb that came with engine did not supply enough fuel and bla bla bla buy new carb and adapter $$$$$$
This is same guy at first braging about engine?????
could it be that a company rep. Poses as hobbies and post crap just to sell his companies junk???
Old 06-30-2020, 06:48 PM
  #11  
su27flanker
 
su27flanker's Avatar
 
Join Date: May 2012
Location: New Zealand
Posts: 69
Likes: 0
Received 0 Likes on 0 Posts
Default

I'm just a confused are we talking about the Evolution 7-77? or the new UMS range?
I don't do glow, to much of a headache in 2020, in my opinion its better to sell the 7-77 and buy a FG-90 at the very least. The FG-90 will give you hours and hours of trouble free enjoyment.

Last edited by su27flanker; 06-30-2020 at 09:24 PM.
Old 07-02-2020, 06:52 AM
  #12  
marksp
My Feedback: (9)
 
marksp's Avatar
 
Join Date: Aug 2004
Location: Redmond, WA
Posts: 840
Received 7 Likes on 7 Posts
Default UMS 5-125 video (test stand)

Originally Posted by Parkfley1 View Post
Well got to see the 5 cylinder 125cc UMS engine up close and running this week. Machining looks good and finish is excellent. From the look of it, every bit as good as a Moki engine. Comes with a factory exhaust ring as standard which is cool and I love the external rockers for ease of maintenance. It's definitely on my list.
Quick vid of my buddies UMS 5-125 on test stand -

Between us we have a bunch of radial engines - He has 4 or 5 Moki's (S250's and 1 S300) and a little Saito FG-60R3 and I have the Tomahawk branded UMS manufactured 5-250, a Moki S250, and a FG-60R3 and can say the UMS line up is quite impressive! In addition to a well designed exhaust ring (sounds great), both the 5-125 and the 5-250 include genuine Walbro carb. His 5-125 also included an electric pump. Both include RcExl ignition with tach out (key on radial's to keep from over revving). They start easily, transition well and pull max ground RPM with recommended prop.

Fairly certain if you perform recommended maintenance, run recommended oil/fuel ratio and keep RPM in range, they should provide many great sounding flights!

Last edited by marksp; 07-02-2020 at 07:06 AM.
Old 07-02-2020, 07:05 AM
  #13  
marksp
My Feedback: (9)
 
marksp's Avatar
 
Join Date: Aug 2004
Location: Redmond, WA
Posts: 840
Received 7 Likes on 7 Posts
Default Tomahawk 5-250

Here's my 5-250 on test stand

Click image for larger version

Name:	50062124103_866fbddf2a.jpg
Views:	126
Size:	66.4 KB
ID:	2267747

Looks great! Runs great! Sounds great!
Old 06-24-2021, 07:21 AM
  #14  
David Jackson
My Feedback: (15)
 
Join Date: Apr 2002
Location: Nashville, TN
Posts: 1,835
Likes: 0
Received 1 Like on 1 Post
Default

Marksp,
Just wondering if you have any additional comments regarding the performance of the UMS 250 radial engine. Thinking about this engine for a new project.
Old 06-28-2021, 04:43 AM
  #15  
marksp
My Feedback: (9)
 
marksp's Avatar
 
Join Date: Aug 2004
Location: Redmond, WA
Posts: 840
Received 7 Likes on 7 Posts
Default

Originally Posted by David Jackson View Post
Marksp,
Just wondering if you have any additional comments regarding the performance of the UMS 250 radial engine. Thinking about this engine for a new project.
Still running fine! Starts easy and runs well. I did add a fuel pump setup exactly like my Moki. Not certain I actually need it but feel better having it.

it’s pulling a 55lb 3.7M PZL-104 Wilga spinning a 34x14 scale Wilga prop - great setup!

Here’s a link to another 260


Last edited by marksp; 06-28-2021 at 05:15 AM.
Old 06-29-2021, 06:56 AM
  #16  
DaleD
 
Join Date: Jul 2009
Location: North Lauderdale, FL
Posts: 285
Received 0 Likes on 0 Posts
Default

Good morning,

As a newby to 4-Stroke Radial gas engines I have been searching with the hope that I would find reading material on the dos and don'ts of their operation. The kind of information that is available in the
Newbie to Gas General Information Thread which to my disappointment does not make specific reference to 4-stroke radial engines. Is it that the VERY same principles that work for 2-stroke single/multiple cylinder engines apply to 4-stroke engines?

Asking kindly to be pointed in the right direction or provided with basic operating, trouble shooting and dos & don'ts type information so I can avoid committing user induced sins on my newly acquired engine.

Thanks

DaleD
Old 07-12-2021, 04:50 AM
  #17  
marksp
My Feedback: (9)
 
marksp's Avatar
 
Join Date: Aug 2004
Location: Redmond, WA
Posts: 840
Received 7 Likes on 7 Posts
Default 4-stroke gas radial tips & tricks

Heres my program (applies mostly to engines with exposed rockers):

Post flying session maintenance:
- clean and lightly oil the rockers
- clean push rod ends
- clean valve stem, or squirt with TriFlow/WD40
- lube the exhaust valves

After every hour of run-time:
- check/adjust valves
The following users liked this post:
DaleD (07-12-2021)
Old 07-23-2021, 10:32 PM
  #18  
Austars
 
Join Date: Jul 2015
Location: Sydney Australia
Posts: 227
Likes: 0
Received 1 Like on 1 Post
Default

Good weekend Guys:
The engine is approved. Many sold in Australia with excellent factory service if you need. In the States, you guys can contact Adrian from CH Ignition. Spare parts cost is very reasonable. There are many videos on youtube to watch.
There are few new models coming UMS 5/150CC, 7/360CC
Their full range engines: 5/55,5/75,5/100,5/125,5/150,5/180,5/210,5/260, 7/99, 7/160, 7/260 (REPLACED BY 5/260), 7/360, 9/115

Cheers
Team Austars Model austars-model.com
The following users liked this post:
marksp (07-26-2021)
Old 08-03-2021, 10:40 AM
  #19  
n8622t
My Feedback: (8)
 
Join Date: Sep 2004
Location: Springdale, AR
Posts: 3,709
Received 23 Likes on 22 Posts
Default

I have two Evolution 7-160cc and they both have had similar issues. I also have a third UMS 7-160 which is built differently from the evolution versions and has had one issue with the ignition. Adrian with CH Ignitions has sent a replacement ignition which should fix the problem.
I also have a UMS 5-125cc which has been flawless. In addition I have a UMS 5-180cc and UMS 7-90cc both brand new in the box.
I've been quite happy with the engines in spite of the issues with the evolution versions.





Old 08-03-2021, 01:47 PM
  #20  
n8622t
My Feedback: (8)
 
Join Date: Sep 2004
Location: Springdale, AR
Posts: 3,709
Received 23 Likes on 22 Posts
Default

Original ignition is history!!!


Old 08-03-2021, 02:15 PM
  #21  
DaleD
 
Join Date: Jul 2009
Location: North Lauderdale, FL
Posts: 285
Received 0 Likes on 0 Posts
Default First Run UMS 5 75

First run of my UMS 5 75 today.


Shes paired with a Gilmore Redlion Racer from Motion RC.

Awesome aftersale service from Adrian at CH-Ignitions.

DaleD
Old 08-06-2021, 08:41 AM
  #22  
karolh
 
Join Date: May 2002
Location: Mandeville, JAMAICA
Posts: 6,728
Received 20 Likes on 19 Posts
Default

Hi Dale, that's a great looking model / engine combo with a wonderful exhaust sound. She looks like she is almost ready for the wide blue yonder, and I do hope that you will have many enjoyable moments flying her.
Old 08-06-2021, 08:49 AM
  #23  
DaleD
 
Join Date: Jul 2009
Location: North Lauderdale, FL
Posts: 285
Received 0 Likes on 0 Posts
Default

Originally Posted by karolh View Post
Hi Dale, that's a great looking model / engine combo with a wonderful exhaust sound. She looks like she is almost ready for the wide blue yonder, and I do hope that you will have many enjoyable moments flying her.
Thanks for dropping in and sharing your thoughts Karol. This build has been slow and deliberate. While Im looking forward to getting her complete and in the air, Im taking my time.

See you soon my friend.

DaleD
Old 08-07-2021, 05:40 PM
  #24  
n8622t
My Feedback: (8)
 
Join Date: Sep 2004
Location: Springdale, AR
Posts: 3,709
Received 23 Likes on 22 Posts
Default

The following users liked this post:
DaleD (08-07-2021)
Old 08-07-2021, 06:27 PM
  #25  
DaleD
 
Join Date: Jul 2009
Location: North Lauderdale, FL
Posts: 285
Received 0 Likes on 0 Posts
Default

That UMS is butter smooth.

DaleD

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.