It flies!

[Hee-Choon Lee]

Carlos,

My copy of your Cellfoam 88 plane flew today!

Attached are a couple of pics.

I am still trying to fine tune the angle of attack and the CG.  How do you have your's set up?

thanks,

sam

[Carlos Reyes]

That's great!

 

Given the small size of the model, I've run into problems seeing it when flown from far away. For that reason, I recommend a fairly forward CG location. I won't get to visit back home for a couple more weeks. I cannot look at my design notes until then. I recommend moving the CG forward until you get good hands-off stability.

 

By angle of attack, do you mean the wing incidence angle? For ease of mounting, I set mine at zero. The KFm airfoils with a step on the bottom are good lift producers even at this low angle of attack.

 

Carlos Reyes, AMA Scientific Leader member #4601
Author of RCadvisor's Model Airplane Design Made Easy and other books.
www.RCadvisor.com founder - Brainy calculator, so you don't have to be.

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From: Hee-Choon Lee <heechoon...@gmail.com>
To: soa...@googlegroups.com
Sent: Sat, November 21, 2009 7:47:41 PM
Subject: [ASA] It flies!

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[Hee-Choon Lee]

Carlos,

Thanks for the reply.

When you attach your wing to the fuse at zero deg incidence, are the front 1/3 of the wing and the rear 1/3 of the wing actually touching the fuse?  If that is so, the rear 1/3 of the wing being at the top layer of 3 layers of the front 1/3 of the wing gets pulled down by 2 layers of Cellfoam 88.  That may create enough of an incidence to be counted greater than zero.

I will attach a diagram to clarify.

Top pic is what I am thinking how you attached your wing to the fuse.

Bottom pic is how I have it attached to the fuse with extra pieces of Cellfoam 88 below the middle and rear 1/3's of the wing where it attaches to the fuse.

sam

[Carlos Reyes]

Thanks for the diagram. What I do is what is in the bottom picture. I add extra pieces of foam over the fuselage to let the wing sit level.

 

I'm attaching a diagram of my new airfoil design. The name has not been finalized. Please do not redistribute. It's a bit different from yours, though you clearly have a good memory!
 

Carlos Reyes, AMA Scientific Leader member #4601
Author of RCadvisor's Model Airplane Design Made Easy and other books.
www.RCadvisor.com founder - Brainy calculator, so you don't have to be.

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From: Hee-Choon Lee <heechoon...@gmail.com>
To: soa...@googlegroups.com

Sent: Mon, November 23, 2009 9:14:32 PM
Subject: Re: [ASA] It flies!

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[Hee-Choon Lee]

Carlos,

I like this one.  I think it is much improved over the one I saw in your prototype.

I am still waiting for your new book.

thanks,

sam

[Carlos Reyes]

This is the same airfoil as on the prototype. Some of the design elements are subtle.

 

I've been working as a model airplane design consultant on a big government project for the last two months. I expect to be mostly done at the end of the year. As soon as my schedule frees up I plan to return to the development of my new designs and books.
 

Carlos Reyes, AMA Scientific Leader member #4601
Author of RCadvisor's Model Airplane Design Made Easy and other books.
www.RCadvisor.com founder - Brainy calculator, so you don't have to be.

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From: Hee-Choon Lee <heechoon...@gmail.com>
To: soa...@googlegroups.com

Sent: Tue, November 24, 2009 9:34:50 PM