UMS Evolution Radial Care and Operation
#1827
Join Date: Dec 2001
Location: Prior Lake,
MN
Posts: 694
Likes: 0
Received 0 Likes
on
0 Posts
Starter
Maxim, I have the Evo7260 gas engine, will a Sullivan Megatron starter turn over a 260 cc engine?
I'm trying to find a starter, not very many choices to choose from.
I'm trying to find a starter, not very many choices to choose from.
#1829
Join Date: Jun 2008
Location: MelbourneVictoria, AUSTRALIA
Posts: 258
Likes: 0
Received 0 Likes
on
0 Posts
Hi Guys,
Just thought I would share with you some photos of my Evo 7-35 I recently installed and test flown in my Great Planes Waco.
The model seems to fly in a scale like fashion with this motor and I look forward to entering into some scale flying events over here in Oz.
I am running with a biela 17x8 propeller and with cowling removed at least initially.
Only problem I am having is I am losing pushrods and I suspect this is due to over revving causing valve bounce. Are any of you able to assist or provide your own experiences with this motor?
Perhaps I just need to operate lower throttle end point to avoid this from happening?
Just thought I would share with you some photos of my Evo 7-35 I recently installed and test flown in my Great Planes Waco.
The model seems to fly in a scale like fashion with this motor and I look forward to entering into some scale flying events over here in Oz.
I am running with a biela 17x8 propeller and with cowling removed at least initially.
Only problem I am having is I am losing pushrods and I suspect this is due to over revving causing valve bounce. Are any of you able to assist or provide your own experiences with this motor?
Perhaps I just need to operate lower throttle end point to avoid this from happening?
#1830
Thread Starter
My Feedback: (62)
OZ, Use a larger propeller such as an 17x10 or 18x8.
Pete, use the Miller reduction on a regular dynatron. The direct drive starters spin too fast. The Miller "Persuader" is an excellent unit.
Hey guys, I think Oz' plane looks fantastic. The engine is just the right scale too.-Tom
Pete, use the Miller reduction on a regular dynatron. The direct drive starters spin too fast. The Miller "Persuader" is an excellent unit.
Hey guys, I think Oz' plane looks fantastic. The engine is just the right scale too.-Tom
Last edited by Maxam; 04-29-2016 at 04:12 AM.
#1831
Join Date: Mar 2006
Location: East Aurora,
NY
Posts: 79
Likes: 0
Received 0 Likes
on
0 Posts
[QUOTE=montt00;12206087]After reading the comments, i have decided to build the Stearman 87 inch from Ziroli.. and alspo trying to build light withpout
Hello Montoo,
I have built the Ziroli 87 inch Stearman. I have an Evo 9-99 in it. It weighs about 30 pounds. It is an excellent flyer. It flies very realistically with the 9-99 and looks great. See my pics on rcscalebuilder.
John
Hello Montoo,
I have built the Ziroli 87 inch Stearman. I have an Evo 9-99 in it. It weighs about 30 pounds. It is an excellent flyer. It flies very realistically with the 9-99 and looks great. See my pics on rcscalebuilder.
John
#1832
Join Date: Apr 2016
Location: San Antonio, TX
Posts: 47
Likes: 0
Received 0 Likes
on
0 Posts
Maxam (Tom) have ordered the OS 7mm bore carb for a 7-77, and the adapter from Adrian. I'm thinking to leave the stock carb on until after break in procedure then going to the OS. Your thoughts? Thanks Bill
#1835
My Feedback: (4)
My Flair Stearman wt. is 35+ lbs. and the 7-77 flies it Great!! also My Ziroli Corsia wt. is 36 lbs. and the 9-99 flies it fairly scale enough for me, and the one who asked about the Electric starter, my sullivan Dynatron with the 3in. belt drive gear reducer made from miller r/c products works great on my Evo 9-99.
#1836
Thread Starter
My Feedback: (62)
Corsair, I do not pay attention to # of turns on carbs. I listen intently to the engine and tune to highest rpm then back off a number of clicks then observe the engines behavior during throttle changes. During early break in it is initially nearly slobbery rich. -Tom
#1838
Hello
I think i am put on the wrong leg, but iīm not sure. Can the the Ziroli Stearman 87 inch fly with the Evo 7-77 or must it be the 9-99?
I'm a little concerned that i have ordered the wrong plan.
Regards,
Timo
I think i am put on the wrong leg, but iīm not sure. Can the the Ziroli Stearman 87 inch fly with the Evo 7-77 or must it be the 9-99?
I'm a little concerned that i have ordered the wrong plan.
Regards,
Timo
#1839
Senior Member
Join Date: Jan 2006
Location: Pitt Meadows,
BC, CANADA
Posts: 862
Likes: 0
Received 0 Likes
on
0 Posts
Finally got around to taking a couple of pics of the giant Aeromaster with the 7-77.
Gas and ign. conversion by Adrian at CH.
Plane weighs 22 lbs, 22-12 prop turning at 5600 on the ground and flies very well. Has a good turn of speed, but is just about perfect at about 1/2 throttle.
Cheers,
Dave.
Gas and ign. conversion by Adrian at CH.
Plane weighs 22 lbs, 22-12 prop turning at 5600 on the ground and flies very well. Has a good turn of speed, but is just about perfect at about 1/2 throttle.
Cheers,
Dave.
#1842
Senior Member
Join Date: Jan 2006
Location: Pitt Meadows,
BC, CANADA
Posts: 862
Likes: 0
Received 0 Likes
on
0 Posts
Tom, not quite sure what you mean by "wear that engine out"
Because I'm using gas or???????......I'm using 20:1 mix.
I tried a 24-12 but it only turned about 44-4500
Cheers,
Dave.
Because I'm using gas or???????......I'm using 20:1 mix.
I tried a 24-12 but it only turned about 44-4500
Cheers,
Dave.
#1844
Senior Member
Join Date: Jan 2006
Location: Pitt Meadows,
BC, CANADA
Posts: 862
Likes: 0
Received 0 Likes
on
0 Posts
Thank you, Tom, I suspected that was what you meant.
I'll stay with the 22-12 as I only use full throttle for take off and the occasional loop now and then.
Most of the flight is at or below 1/2 throttle.
I even had one spectator ask me if it was electric as it is so quiet!
After a few more flights I'm going to pull the back off the engine and see how things look inside regarding enough oil etc....(20:1 Stihl ultra) I seem to be getting some lube pushing up past the cam lifters so good lubrication there, I think.
As an aside, I recently acquired a brand new, un run 7-260 serial # 00002 for less than half price. However it did not come with the wiring harness from the ignition box to the battery/switch. I've heard of other people having the same issue, This has a 4 pin connector and Horizon are unable to supply without the complete ignition...$900.00 US!
This 4 pin connector has only 2 wires..pos. and neg.... as far as I can tell from pictures. If I can find out which pins they go to I should be able to get this engine running.
Cheers,
Dave.
I'll stay with the 22-12 as I only use full throttle for take off and the occasional loop now and then.
Most of the flight is at or below 1/2 throttle.
I even had one spectator ask me if it was electric as it is so quiet!
After a few more flights I'm going to pull the back off the engine and see how things look inside regarding enough oil etc....(20:1 Stihl ultra) I seem to be getting some lube pushing up past the cam lifters so good lubrication there, I think.
As an aside, I recently acquired a brand new, un run 7-260 serial # 00002 for less than half price. However it did not come with the wiring harness from the ignition box to the battery/switch. I've heard of other people having the same issue, This has a 4 pin connector and Horizon are unable to supply without the complete ignition...$900.00 US!
This 4 pin connector has only 2 wires..pos. and neg.... as far as I can tell from pictures. If I can find out which pins they go to I should be able to get this engine running.
Cheers,
Dave.
#1845
Hello all.
Yesterday iI received the Ums 7-77. It's a jewel. But I have a litte question. Some of the pushrods ( 7) are loose. Is this normal, or must I adjust the valves before break-in so that the pushrod are more tight?
Regards,Timo
Yesterday iI received the Ums 7-77. It's a jewel. But I have a litte question. Some of the pushrods ( 7) are loose. Is this normal, or must I adjust the valves before break-in so that the pushrod are more tight?
Regards,Timo
#1848
Hello
I donīt understand. Many pushrods are loose. Even when the inlet and outlet valves are closed, the pushrods have much play 0,4 to 0,7 mm. I have seen in an earlier thread that there was another guy with the same lack.
Is it a good idea when I adjust the valves before the first break-in? I like to hear your comment.
Regards,Timo
I donīt understand. Many pushrods are loose. Even when the inlet and outlet valves are closed, the pushrods have much play 0,4 to 0,7 mm. I have seen in an earlier thread that there was another guy with the same lack.
Is it a good idea when I adjust the valves before the first break-in? I like to hear your comment.
Regards,Timo
#1849
Senior Member
Join Date: Apr 2005
Location: goolwasa, AUSTRALIA
Posts: 1,680
Likes: 0
Received 0 Likes
on
0 Posts
Hello
I donīt understand. Many pushrods are loose. Even when the inlet and outlet valves are closed, the pushrods have much play 0,4 to 0,7 mm. I have seen in an earlier thread that there was another guy with the same lack.
Is it a good idea when I adjust the valves before the first break-in? I like to hear your comment.
Regards,Timo
I donīt understand. Many pushrods are loose. Even when the inlet and outlet valves are closed, the pushrods have much play 0,4 to 0,7 mm. I have seen in an earlier thread that there was another guy with the same lack.
Is it a good idea when I adjust the valves before the first break-in? I like to hear your comment.
Regards,Timo