Engine change on UCD 60
09-01-2006, 02:14 PM
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Engine change on UCD 60
I'm a serious pattern flyer really, but as the season here starts to finish,I'd like to play around a bit with some 3D.
I've got A UCD 60 with an OS 90FX, but it's Knackered--runs Ok for 3 mins or so,then overheats and slows down,to the point that the model can only just stagger out of a hover.
I don't want to go 4/stroke or electric, so am thinking OS 120 AX---The blurb says it fits into the 91 space,and it doesn't seem to weigh much more--the current C.of G. is a little behind the max rearward recommendation anyway, and doesn't seem to be a problem.
So--Is it a good idea?
Any prop suggestions, or any other advice?
I've got A UCD 60 with an OS 90FX, but it's Knackered--runs Ok for 3 mins or so,then overheats and slows down,to the point that the model can only just stagger out of a hover.
I don't want to go 4/stroke or electric, so am thinking OS 120 AX---The blurb says it fits into the 91 space,and it doesn't seem to weigh much more--the current C.of G. is a little behind the max rearward recommendation anyway, and doesn't seem to be a problem.
So--Is it a good idea?
Any prop suggestions, or any other advice?
09-01-2006, 02:54 PM
#2
RE: Engine change on UCD 60
id like to know why you wouldnt consider a 4stroke, since the saito 125 is probably one of the best engines for this plane
.
just wondering....
. just wondering....
09-01-2006, 03:16 PM
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RE: Engine change on UCD 60
Saitos are much rarer here than in the USA--there's a distinct lack of local knowledge about them--for instance,the one you mention isn't even listed....
And ,although I see lots of YS 160s on the pattern scene, the thought of 30% nitro fuel@ approx£27/$41/US gall doesn't appeal!
And ,although I see lots of YS 160s on the pattern scene, the thought of 30% nitro fuel@ approx£27/$41/US gall doesn't appeal!
09-01-2006, 03:28 PM
#4
RE: Engine change on UCD 60
ORIGINAL: f3a05
Saitos are much rarer here than in the USA--there's a distinct lack of local knowledge about them--for instance,the one you mention isn't even listed....
And ,although I see lots of YS 160s on the pattern scene, the thought of 30% nitro fuel@ approx£27/$41/US gall doesn't appeal!
Saitos are much rarer here than in the USA--there's a distinct lack of local knowledge about them--for instance,the one you mention isn't even listed....
And ,although I see lots of YS 160s on the pattern scene, the thought of 30% nitro fuel@ approx£27/$41/US gall doesn't appeal!
Based on a LOT of reading here as a Mod, I think that guys are having real good luck with the OS 120AX in that size plane.
09-03-2006, 11:05 AM
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RE: Engine change on UCD 60
I hade the same problem with the overheating. I have anSuper Tiger .90 which was doing them same as yours. I opened up the air in;ey and outlet to get more airflow across the engine and changed the prop to a 15x6 APC. I have not had any problems since then. Check your airflow, it's a bit cheaper then a new engine.
09-03-2006, 12:01 PM
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RE: Engine change on UCD 60
Thank you--sadly the OS 91 has been the same for a long time--the last model it was in was a profile Bipe, so airflow wasn't the prob. there.
I should have retired it earlier really.
I should have retired it earlier really.
09-04-2006, 01:15 PM
#10
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RE: Engine change on UCD 60
you just need a new carb. I had the same problem on my 91 fx. Got rid of the remote needle carb and fitted an mvvs carb and the engine was great.magnum carb is also good
09-04-2006, 01:26 PM
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RE: Engine change on UCD 60
[quote][/quyou just need a new carb. I had the same problem on my 91 fx. Got rid of the remote needle carb and fitted an mvvs carb and the engine was great.magnum carb is also good
ote]
Thanks---I'll certainly try that----I did wonder if the fuel was heating up via that silly ali. back plate carb. mount---so I sawed it off and mounted the carb remote, on the fus side, and am currently running it with a Cline regulator.
It hasn't improved though--starts well, throttles nicely ,flies Ok for three minutes or so then overheats, slows down, and is in danger of wrecking the model.
ote]
Thanks---I'll certainly try that----I did wonder if the fuel was heating up via that silly ali. back plate carb. mount---so I sawed it off and mounted the carb remote, on the fus side, and am currently running it with a Cline regulator.
It hasn't improved though--starts well, throttles nicely ,flies Ok for three minutes or so then overheats, slows down, and is in danger of wrecking the model.
