O.S. 70 Ultimate
07-31-2007, 12:53 PM
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O.S. 70 Ultimate
O.S. stopped or discontinued the OS 70 ultimate for issues, but have re-released it now and claim all the issues have been fixed, has anyone run one lately?
08-01-2007, 02:00 AM
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RE: O.S. 70 Ultimate
I bought one of these engines two months ago. Till the moment it runs great. Full of power, little running in...
There is a previous release of these engines that had a lot of problems related to the pump system.. It looks like if OS has solved this problems
As I said, till the moment, I am really happy with it...
Regards
There is a previous release of these engines that had a lot of problems related to the pump system.. It looks like if OS has solved this problems
As I said, till the moment, I am really happy with it...
Regards
08-01-2007, 07:07 AM
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RE: O.S. 70 Ultimate
thanks for the info, what prop and fuel are you running on yours? the manual says it can run 30% nitro, and that is readily available over here so will probably use either 20/20 fuel or heli fuel.
08-01-2007, 06:17 PM
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RE: O.S. 70 Ultimate
I ran mine today, got 9800 on an apc 13x7 and 15% fuel. Still less than one gallon run time on it so far. Surprised me how well it idles right out of the box, haven't even touched the low speed needle yet. I really like the slide carb.
My YS 63s probably makes a little more power(the supercharging is very efficient), wait a minute, I didn't run the ultimate on 30% heli yet so they are probably closer than I thought. I've had nothing but problems with the silicone plunger sticking in the regulator on my 63S, it's going in for service again soon.
I think this time they got the pump/regulator system in the ultimate dialed in now!
My YS 63s probably makes a little more power(the supercharging is very efficient), wait a minute, I didn't run the ultimate on 30% heli yet so they are probably closer than I thought. I've had nothing but problems with the silicone plunger sticking in the regulator on my 63S, it's going in for service again soon.
I think this time they got the pump/regulator system in the ultimate dialed in now!
08-01-2007, 08:04 PM
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RE: O.S. 70 Ultimate
Good to know! Glad O.S. got the bugs worked out, and agree the YS motors can be finicky. I don't mind giving up a smidge of power for ease and reliabilty. I will probably start with a 12x7 and go from there.
08-03-2007, 04:51 AM
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RE: O.S. 70 Ultimate
Hi again
A 12x7 propeller is small for this engine. OS recommends 13x6 and 13x7 propellers
I am using a 12x8 APC, home brew fuel 10% nitro and works fine, really well.
Regards
FER
A 12x7 propeller is small for this engine. OS recommends 13x6 and 13x7 propellers
I am using a 12x8 APC, home brew fuel 10% nitro and works fine, really well.
Regards
FER
