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UMS Evolution Radial Care and Operation

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UMS Evolution Radial Care and Operation

Old 12-03-2019, 12:27 PM
  #2451  
Maxam
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At 34 pounds I would be using a 9-99 or a Moki 150!
Old 12-03-2019, 01:44 PM
  #2452  
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Looks like that Tom.
​​My experiences with these motors is starting to become a dissapointment. The 7-77 is a perfect size and fit for this airframe and won't fly it.
i had the exact same experience with a 7-35 last year that wouldn't fly a 1/6 scale stearman.
Maybe this is just a pipe dream with these scaled down hobby motors.
I have yet to mount my Moki 250 7 cylinder on my 1/3 scale Stearman. It flies great with a DA150 twin right now. If the Moki is a dog I may as well sell all ten radials off and make some house payments lol.
Don't want to be a quitter but....
Old 12-03-2019, 05:45 PM
  #2453  
Maxam
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All planes I have radials in fly solidly.
1. Hangar9 Corsair with Saito 90r3 People said it will not work. Have been flying it for 10 years. Secret, plane weighs 7.5 pounds and 13x7 APC
2. Pietenpol Sky Scout 1/4 scale and 12 pounds Seidel ST540 18x10 SEP prop. Overpowered. Engine is 40cc
3. 1/4 scale Yak 54 with 7-77 and 24x12 Xoar Hot rod with sparkling performance, 15 pounds, lightness is key again
4. 91 inch Black Horse Corsair with the older 7-70 (bigger than Hangar 9's big 30 pound Corsair) Flies solidly due to weighing !!! 21 pounds.
5. Super Flyin' King with Moki 215. 132 inch wingspan and 38 pounds 33x16 prop. Overpowered
6. Yak 55SP 37% 108 inch wingspan 33x16 prop 28 pounds Moki 215. Hot rod with accelerating vertical.
7. RobinHood 99 with 9-90 and 22 pounds 25x12 Xoar. Solid performance
All these planes have one thing in common, good props and light. I have seen two Stearmans fly with the 7 cylinder 250 and a bunch with the 215 and 250 5 cylinder Moki's. The 1/3 scale Stearmans with the 7 cylinder engines were solid and the owners were quite satisfied. Please try your Stearman again with a 24x12 prop, IF you have the 7-77. Also at least 7% nitro in the fuel. The older 7-70 is disproportionately less powerful than the 7-77. The Stearman must be heavily built. Do you have onboard glo with those super heavy batteries? I have no onboard glow power on my glo radials. Final note, the Moki 7250's I have seen run beautifully.
Old 12-04-2019, 06:10 AM
  #2454  
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Originally Posted by Maxam View Post
All planes I have radials in fly solidly.
1. Hangar9 Corsair with Saito 90r3 People said it will not work. Have been flying it for 10 years. Secret, plane weighs 7.5 pounds and 13x7 APC
2. Pietenpol Sky Scout 1/4 scale and 12 pounds Seidel ST540 18x10 SEP prop. Overpowered. Engine is 40cc
3. 1/4 scale Yak 54 with 7-77 and 24x12 Xoar Hot rod with sparkling performance, 15 pounds, lightness is key again
4. 91 inch Black Horse Corsair with the older 7-70 (bigger than Hangar 9's big 30 pound Corsair) Flies solidly due to weighing !!! 21 pounds.
5. Super Flyin' King with Moki 215. 132 inch wingspan and 38 pounds 33x16 prop. Overpowered
6. Yak 55SP 37% 108 inch wingspan 33x16 prop 28 pounds Moki 215. Hot rod with accelerating vertical.
7. RobinHood 99 with 9-90 and 22 pounds 25x12 Xoar. Solid performance
All these planes have one thing in common, good props and light. I have seen two Stearmans fly with the 7 cylinder 250 and a bunch with the 215 and 250 5 cylinder Moki's. The 1/3 scale Stearmans with the 7 cylinder engines were solid and the owners were quite satisfied. Please try your Stearman again with a 24x12 prop, IF you have the 7-77. Also at least 7% nitro in the fuel. The older 7-70 is disproportionately less powerful than the 7-77. The Stearman must be heavily built. Do you have onboard glo with those super heavy batteries? I have no onboard glow power on my glo radials. Final note, the Moki 7250's I have seen run beautifully.
Thanks Tom
I have not had the same level of success with my radial fantasy. It does seem the common thread to your experience is lightly built airframes and very good engine performance.
I have experienced neither.
I am trying to find a high pitch 24 to give it another try but haven't found anything over the 10 pitch I have. I have not added nitro to my fuel. Seems discouraged by the manufacturer, and corrosive. But that's an easy test.
maybe it will fly it that way. It flies now but with no margin for error.
This has been an expensive attempt to fly scale planes, I have given up on single seat fighters but that is where my intrest was in the hobby.
I now have a greater appreciation for low wing loading biplanes🙄
I could shed a couple pounds if I nix the sonictronic driver and battery, the engine will run without it barely at near full throttle. But how do you start it? Seven drivers hand removed with a running engine?
Thanks for your help.
Hoping for better things with the Moki.
Old 12-04-2019, 08:03 AM
  #2455  
Maxam
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The nitro in the fuel will dramatically improve idle, starting and power. Didn't your engine come with a plug harness and ground wire??? Use that and a plug near the engine with as short of wiring as possible. My starting battery is 8 700mahr nicads in parallel. Again with short thick wire. Check your PM.
Old 12-04-2019, 11:18 AM
  #2456  
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Originally Posted by Maxam View Post
The nitro in the fuel will dramatically improve idle, starting and power. Didn't your engine come with a plug harness and ground wire??? Use that and a plug near the engine with as short of wiring as possible. My starting battery is 8 700mahr nicads in parallel. Again with short thick wire. Check your PM.
Wow Tom thanks for your kind offer. I will take you up on that Sir.
Your suggestions are excellent. I will incorporate both into my next test runnings. I can shed about a pound by nixing the driver and battery.
I wasn't thinking it would be reliable without it, but the nitro will probably have a great effect on all aspects of it's running characteristics. It runs cool on straight methanol. I don't think heat will be a problem with a 7% nitro add.
probably 50/50 cut store bought Omega, that will get the castor also that way. And splash an oz or two of Redline in it to get it around 10% lube content.
i am having trouble sourcing props above 10 pitch in 24 inches, Tammy at Valley View is trying to help. She thinks maybe Zoar, but hasn't got back to me yet.
Thanks again!
Old 12-05-2019, 05:16 AM
  #2457  
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Go to justmodelprops.com they have 24x12 Xoars.
Old 12-05-2019, 08:06 AM
  #2458  
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Originally Posted by Maxam View Post
Go to justmodelprops.com they have 24x12 Xoars.
Thanks Tom
I found one at Chiefs website last night . It's on the way!
Thanks for the lead. Have not seen any higher pitch anywhere, wonder it that's it out there.
Ever seen greater than 12 in a 24 inch?
Old 12-05-2019, 10:16 AM
  #2459  
Maxam
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Yes, Fiala on the Vogelsang Aeroscale site has a 24x14 , which is not that high of pitch. That is like a 12x7
Old 12-05-2019, 11:12 AM
  #2460  
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Originally Posted by Maxam View Post
Yes, Fiala on the Vogelsang Aeroscale site has a 24x14 , which is not that high of pitch. That is like a 12x7
Duh.
Bought my Moki from Gotz and Daphne Nice people'.
Do you think a 24 /14 would be a reasonable try above the 24/14. I will order one up.
Old 12-05-2019, 02:27 PM
  #2461  
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No, too much for the engine!!
Old 12-05-2019, 04:23 PM
  #2462  
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Originally Posted by Maxam View Post
No, too much for the engine!!
Thanks Tom
Your saving me from myself...lol
I sure hope the nitro and propping will be just enough for some comfort with this thing. It maxed out about 5200 with the 24/10. And I ran it at an even 5000. It was flyable but with a little to much "puckering" for my flying skills My brother in law test pilot (Chuck Yeager as we call him) , said " it's a handful " when he handed me my radio during the maiden. My first lazy flat aileron turn had me confirming his opinion. LOl
if I can get a little safety factor and an even lower rpm I will be ok with this set up. And happy to stress the engine less.
Flying in Michigan is day by day with the weather here, but I will try this thing again soon as the stars align.
My goal is just an everyday radial to fly with low stress level. So nice to hear these motors in low passes at low rpms. Super scale, close to Heaven, awesome reminder of what role these machines played in human history
Thanks again.
Will post results when I can, collected wisdom is AWESOME.
Sharing it is a blessing.
👍
​​​​​​

.
Old 12-08-2019, 04:41 PM
  #2463  
TimD.
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You need to get at least a 12" pitch prop. drop to a 22x12 or 21x14 for the 7-77 I have 3 and have flown many hours on them my rule is no less than 12" pitch and 5000rpm on the ground. Figure your diameter by rpm.

Low rpm engine needs the pitch for airspeed.
Old 12-09-2019, 06:28 AM
  #2464  
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Originally Posted by TimD. View Post
You need to get at least a 12" pitch prop. drop to a 22x12 or 21x14 for the 7-77 I have 3 and have flown many hours on them my rule is no less than 12" pitch and 5000rpm on the ground. Figure your diameter by rpm.

Low rpm engine needs the pitch for airspeed.
Hi Tim
Thanks for chiming in. First flight was with a 22/12. I can't remember exact tack reading before it left the ground but I am positive it was above 5000.
Floundered in the climbout and stalled the airframe into the wind and dropped.
Ran it with a 24/10 on the ground at 5000. Flew it with that prop successfully but it was underpowered and set for failure.
Running numbers through prop calculators based on 5000 rpm the 24/12 Tom recommended gives the best mph predictions 49.3.
Interestingly, the 21/14 you recommend does show 57.5 mph. 7.5 mph more than any comparable.
I have a 24/12 in the mail to try, wouldn't hurt to try a 21/14 if this 24 won't fly it.
As Tom also opined, I am going to shed some airframe weight to try to get it a little more sprightly.
Stearmans don't usually fly like rocks, but this one sure did!
Thanks for your thoughts Sir
Old 12-10-2019, 06:26 PM
  #2465  
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Usually the climb out is very scale like " No straight up". Slow and steady climb out. Once your up and make a circuit around the field it will get going pretty good. I have a Zero at 32lbs and a corsair at 31lbs .I have been using a 21x13-3 blade on the corsair and a 21x12-3 blade in the Zero.

If you have not put a OS carb on it. turn the needle out it cannot be rich enough.
Old 12-10-2019, 07:52 PM
  #2466  
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Originally Posted by Hyjinx View Post
Hi Tim
Thanks for chiming in. First flight was with a 22/12. I can't remember exact tack reading before it left the ground but I am positive it was above 5000.
Floundered in the climbout and stalled the airframe into the wind and dropped.
Ran it with a 24/10 on the ground at 5000. Flew it with that prop successfully but it was underpowered and set for failure.
Running numbers through prop calculators based on 5000 rpm the 24/12 Tom recommended gives the best mph predictions 49.3.
Interestingly, the 21/14 you recommend does show 57.5 mph. 7.5 mph more than any comparable.
I have a 24/12 in the mail to try, wouldn't hurt to try a 21/14 if this 24 won't fly it.
As Tom also opined, I am going to shed some airframe weight to try to get it a little more sprightly.
Stearmans don't usually fly like rocks, but this one sure did!
Thanks for your thoughts Sir
Originally Posted by TimD. View Post
Usually the climb out is very scale like " No straight up". Slow and steady climb out. Once your up and make a circuit around the field it will get going pretty good. I have a Zero at 32lbs and a corsair at 31lbs .I have been using a 21x13-3 blade on the corsair and a 21x12-3 blade in the Zero.

If you have not put a OS carb on it. turn the needle out it cannot be rich enough.
32 pounds. High wing loading. Three blade prop,
that was my original plan
Guess this motor should scale fly this biplane.
Inverted.
Props are on the Polar Express.
Wheel see
Old 12-22-2019, 05:56 PM
  #2467  
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Originally Posted by Hyjinx View Post
32 pounds. High wing loading. Three blade prop,
that was my original plan
Guess this motor should scale fly this biplane.
Inverted.
Props are on the Polar Express.
Wheel see
Well folks
Testing is complete.
The motor was refitted with a 24/10. Five percent nitro added to the fuel. 1 pound shaved off with the removal of the glo driver unit and battery.
Re-tuned to produce 4900 rpm and 1500 rpm idle. Started and ran well, idle and wot without glo driver, transitioning well through the rpm range.
Produced 15 pounds of comparable power against a static pound scale.
Refitted with the 24/12. Running the same fuel the motor topped out at 4400. Ran and transitioned well. Static comparable of 12 pounds, but "felt" like it was moving more air.
Test pilot said leave the 24/12 on it and fly.
First flight went ok. Long ground run up required but climbed out slow but steady. Flew ten minutes. Test pilot reported it better than the 24/10 flights but not substantially better or less nerve wracking. Flat rudder turns at full speed. Aileron turns still scarry.

The second flight was to be mine, Brian was going to take it up and hand it off to me. Long run up produced a very tenuous take off with a touch of tail wind. The airframe was unable to climb out to a safe distance to make the first turn. Plane was nearing line of sight loss against a stand of mature trees.
Pilot attempted a turn, not enough air speed and elevation airframe stalled and again he was able to ditch it wheels down. Total loss of airframe. Motor is ok other than the new 24/12 prop.
Lesson learned. My Evolution 7-77 wouldn't fly a thirty two pound biplane. With the largest prop it could swing.
Lesson 2
Find a 15 pound 1/4 scale biplane and try again.LOL.
Old 12-22-2019, 06:07 PM
  #2468  
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Anyone by chance have a 7-50cc gas radial theyd part with?

Ive got a 74 ESM Corsair that I think that we gone would be perfect in. Figured Id ask before dropping $2k on one.
Old 12-23-2019, 06:07 AM
  #2469  
Maxam
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Rats! Sorry to hear about your plane Hyjinx. Don't quit on radials. I did have concerns about the weight. I understand Hobby Lobby (old name) on line has a Waco that flies like a dream with your engine. It has an orange fuselage and silver wings. It is big and light. Check it out! -Tom
Old 12-23-2019, 12:01 PM
  #2470  
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Originally Posted by Maxam View Post
Rats! Sorry to hear about your plane Hyjinx. Don't quit on radials. I did have concerns about the weight. I understand Hobby Lobby (old name) on line has a Waco that flies like a dream with your engine. It has an orange fuselage and silver wings. It is big and light. Check it out! -Tom
Thanks Tom
Definitely a bummer. Trying to find a lighter airframe. I checked hobby lobby, I couldn't find a waco except a 30 inch foamy?
There is a Stearman option from tower that looks about right. Rather find a great lakes or a waco thought if it's not military.
Fortunately, the engine was unharmed in the wreck. The pt-17 repairable but probably won't invest more time in that airframe/ boat anchor.lol
Old 12-23-2019, 12:06 PM
  #2471  
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Hello again..I am. About to maiden my Ziroli Stearman...it should weigh between 18 &20 lbs. It came in at 22 mostly due to evolution 7-77 radial.
I have a 22/12 prop and also changed carb as advised earlier in thread. I want to thank all for sharing there experiences, both good and bad. I also
would like to thank MAXIM for his dedication to informing / educating the rest of us. I have followed his every suggestion with success. The change to
Carburetor kept me from using engine as boat anchor. And I inject a few drops of air tool oil into pushrod follower hole every few days..still smooth turning..
I just installed new batteries and am waiting for fuel to arrive..I have methanol to cut fuel 50/50 to give 7% nitro, 10% oil (Castor) and
the rest methanol. Using 22 inch dia prop for ground clearance concern. I have had plane built for a while but am very nervous about flying it as
parts are hard to come by. I was trying to buy a few extra pushrod but even thou I have exact part number (evo77716a) I can't find any ?
i want to ask Maxim ....do you mix your own fuel ? Now that local hobby shop has closed i pay high shipping price to get fuel.
thanks again and Merry Christmas. ..
Old 12-23-2019, 12:20 PM
  #2472  
badangle
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Hey guys and gals
wish me luck on my upcoming maiden flight...also, I'm not very up to speed on using this web site. I start in Forums and search down page to find Glow engines,then down to Evolution then go to page 99.
Is there a short cut ? And I would like to post some pictures of plane but don't know how .....can you help me out ?

Inside of my stearman....

Last edited by badangle; 12-23-2019 at 04:05 PM. Reason: Add photo
Old 12-23-2019, 12:31 PM
  #2473  
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Originally Posted by badangle View Post
Hello again..I am. About to maiden my Ziroli Stearman...it should weigh between 18 &20 lbs. It came in at 22 mostly due to evolution 7-77 radial.
I have a 22/12 prop and also changed carb as advised earlier in thread. I want to thank all for sharing there experiences, both good and bad. I also
would like to thank MAXIM for his dedication to informing / educating the rest of us. I have followed his every suggestion with success. The change to
Carburetor kept me from using engine as boat anchor. And I inject a few drops of air tool oil into pushrod follower hole every few days..still smooth turning..
I just installed new batteries and am waiting for fuel to arrive..I have methanol to cut fuel 50/50 to give 7% nitro, 10% oil (Castor) and
the rest methanol. Using 22 inch dia prop for ground clearance concern. I have had plane built for a while but am very nervous about flying it as
parts are hard to come by. I was trying to buy a few extra pushrod but even thou I have exact part number (evo77716a) I can't find any ?
i want to ask Maxim ....do you mix your own fuel ? Now that local hobby shop has closed i pay high shipping price to get fuel.
thanks again and Merry Christmas. ..

I bought Ritchs Brew at Toledo. He makes a specific mix for Evo Radials. 5% nitro and 10% oil. I added 2.5 oz of castor per Toms recommendation because apparently 10% is a little light.
Old 12-23-2019, 01:46 PM
  #2474  
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Thank jijohn but the shipping is the problem. I have to order from internet and fuel is hasmat....hazardous material ..expensive to ship.
Old 12-23-2019, 02:52 PM
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I go to Toledo to buy fuel so I buy and add methanol from a race shop in town. Horizon has no pushrods? Personally I have never lost a pushrod. Don't over rev the engine!

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