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Post by swampfox201 on Mar 23, 2007 6:51:40 GMT 1
The Super Cub is set up with a nose heavy Center of Gravity (COG). The COG is ahead of the Center of Lift (COL). This is a stable airplane. When you give the cub more power the nose comes up...less power it comes down. I was wondering if you move the COG closer to or at the (COL) will the nose stay in its current attitude independent of power. For instance if I have the plane trimmed out level at 2/3 power and I go to full power will the airplane not climb? And if I cut the power will the airplane stay level until it stalls?
Todd
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wjcjr
Squadron leader
Posts: 103
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Post by wjcjr on Mar 23, 2007 18:11:22 GMT 1
Once I get back in the air regularly, moving right now, I will tweak and play with my COG and see what happens. Right now I am about .1875" behind the COL. At .50" behind it is very unstable but glides forever, or so I found.
Wayne
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Post by swampfox201 on Mar 23, 2007 21:51:42 GMT 1
ah that is my thought. If the tail doesn't have to work as hard to keep the nose up then it should result in faster speeds, and better climb rates.
My thought is with a nose heavy airplane the wing lifts upward but the tail has to push down. With a neutral airplane the tail doesnt have to push down at all so it should be more efficient albeit less stable.
Anyone else have any theories on this?
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Post by cjg on Mar 24, 2007 2:13:28 GMT 1
How do we calculate or find the center of lift?
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Post by swampfox201 on Mar 24, 2007 2:23:55 GMT 1
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Post by cjg on Mar 24, 2007 14:33:00 GMT 1
Great article. thanks!
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Post by mrmugen on Apr 10, 2007 17:24:34 GMT 1
My plane balances 2.5" behind the leading edge. This is .7" behind the col. I like it this way better now that I can fly better. It seems to really improve elevator inputs.
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Post by mrmugen on May 13, 2007 5:35:36 GMT 1
Man do I wish I would have printed or saved that page now.
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SteveR
Flying officer
Posts: 3
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Post by SteveR on May 13, 2007 18:01:11 GMT 1
Man do I wish I would have printed or saved that page now. Try this link. tinyurl.com/3e26fkSteve |
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Post by mrmugen on May 13, 2007 18:07:04 GMT 1
Printed and filed! Thank you!
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Post by mtsavage on Jan 27, 2014 4:29:08 GMT 1
wow, i think i got it,,, i ll need to do more reading on cog and col
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Post by hghost on Feb 2, 2014 1:47:33 GMT 1
My Cub came very tail heavy....I set my CG to prefect level....had to add nose weight to get it level.
Flies smooth and fast enough....climbs really fast and descends even faster.
And enjoys landing in Tall Pines ( must be a fetish ).
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Post by flydiver on Feb 3, 2014 3:36:31 GMT 1
How is that? Stock components, stock airframe, it would be hard to have it not right.
Or was this a mod?
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Post by hghost on Feb 5, 2014 4:11:50 GMT 1
SC came stock tail heavy if that is what you are asking ?
I had to add weight in the nose to level it out
Flies great, climbs great, descends great
even lands in tree's great ( mind of it's own-not so great )
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Post by flydiver on Feb 5, 2014 17:01:00 GMT 1
SC came stock tail heavy if that is what you are asking ? That's what I was asking. Seems improbable. In general they come a tad nose heavy which is more suitable for a trainer. I'm puzzled what would do that. |
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