OS 52 Surpass on Cub - RCCanada - Canada Radio Controlled Hobby Forum
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Old 10-12-2019, 10:06 AM   #1
cassat
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OS 52 Surpass on Cub


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Wondering how an OS 52 Surpass 4 stroker would be on a Goldberg Cub flying off wheels only ? Assuming it turns a 12 x 5 at approximately 8350 rpm ?
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Old 10-12-2019, 12:25 PM   #2
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Re: OS 52 Surpass on Cub

I have a OS52 Surpass 4 stroke on my Sig Komander, 5.5lbs, and I get 9400 RPM on the ground with an APC 12x6 on 15% fuel. With an APC 12x5, it's turning 11,300 on the ground and when in the air, sounds like it's maxed out on RPM as there appears to be no difference between 2/3rds and full throttle. Large, effortless loops and great vertical power. While the Cub is heavier than the Komander, it's a Cub, I'm sure it would fly it fine with a little extra power to spare.
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Old 10-12-2019, 12:33 PM   #3
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Re: OS 52 Surpass on Cub

Thanks for the reply Dave.
Yes, I guess 12 x 6 is the way to go then. I was careful to keep it light so far but will still be 6 and 1/2 pounds with more wing area than you. I was more concerned with getting
a good takeoff run from grass.

Dave Too
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Old 10-12-2019, 12:36 PM   #4
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Re: OS 52 Surpass on Cub

You won't have any problem getting it off the ground. My Komander was my first plane after a 20 year break. Took off at half throttle.
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Old 10-12-2019, 12:43 PM   #5
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Re: OS 52 Surpass on Cub

That's great to hear
I think that was Martins favorite plane there twenty some years ago
I also built another Kougar. I think your field was the last place I flew one back in the 90s.
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Old 10-12-2019, 12:45 PM   #6
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Re: OS 52 Surpass on Cub

Oops, just remembered Martin had the Kavalier back in those days
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Old 10-12-2019, 02:26 PM   #7
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Re: OS 52 Surpass on Cub

A fellow had a Goldgerg cub many years back in Dawson with a Saito 50 and it flew great. Definitely go 12x6 or even 13x5 if you want less speed and jump off the ground take offs.
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Old 10-12-2019, 02:37 PM   #8
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Re: OS 52 Surpass on Cub

Thanks for the suggestion Dennis. Good idea.
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Old 10-12-2019, 04:30 PM   #9
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Re: OS 52 Surpass on Cub

Quote:
Originally Posted by cassat View Post
That's great to hear
I think that was Martins favorite plane there twenty some years ago
I also built another Kougar. I think your field was the last place I flew one back in the 90s.
Ya, I did the maiden flight on my Kougar this summer, what a smooth plane, love it. Have a Saito 56 I'm going to put in a Sig Smith Miniplane next. Have to get my 1/4 scale clipped wing Cub that I was going to have finished this spring finished first though LOL.
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