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General control line discussion => Open Forum => Topic started by: Pat on September 23, 2012, 05:30:28 PM

Title: Magnum wing, second attempt to post.
Post by: Pat on September 23, 2012, 05:30:28 PM: Hi all, tried to post this once with no luck. Here is the wing for my Magum ready for SLC, silkspan, and dope. Sorry for the poor quality of the pics, the lighting was not very good. Now on to the fuse!!

Pat
Title: Re: Magnum wing, second attempt to post.
Post by: Bill Little on September 23, 2012, 05:45:42 PM: Looking good, Pat! You will be well pleased with the Magnum, every one I have seen has been a good flier.

Bill
Title: Re: Magnum wing, second attempt to post.
Post by: wmiii on September 23, 2012, 06:27:04 PM: I agree with Bill. The wing looks great. I've had two Magnum's, this is just a suggestion, I used 6 hinges on each flap and don't even think about a Monocote type of covering for the flaps. They won't be anyway near stiff enough. Don't ask.

Walter
Title: Re: Magnum wing, second attempt to post.
Post by: Pat on September 23, 2012, 07:07:46 PM: I wish the pics were better, it came out better than my last one did. I noticed the flaps were a bit flimsy. I am wondering about sheeting them with 1/32 balsa. Any thoughts?

Pat
Title: Re: Magnum wing, second attempt to post.
Post by: Randy Cuberly on September 23, 2012, 07:22:13 PM: Quote from: Pat on September 23, 2012, 07:07:46 PM
I wish the pics were better, it came out better than my last one did. I noticed the flaps were a bit flimsy. I am wondering about sheeting them with 1/32 balsa. Any thoughts?

Pat

Hi Pat,
By all means sheet the flaps with balsa. I've had two Magnums in the past, one with sheeted flaps (I used 1/16 balsa) and the other with the same construction you have shown in the pic's, and covered with silkspan. The difference in stiffness and flight ability was phenomonal. I went back and sheeted the one with silkspan (actually I replaced the flaps with sheeted ones) and the airplane flew much better and trimmed much more normally. Without the sheeted flaps the trimming was very hit and miss and I discerened that it was because the flaps were flexing. Sheeting them made a different airplane out of it.
The Magnum is essentially a very good flying airplane and a real tribute to it's designer Mike Pratt. I don't think Mikes's original had unsheeted flaps. I'm inclined to believe that was a kitting change to save wood. Not sure about that but memory says I heard that from Mike when he lived here in AZ.
At any rate...sheet the flaps...you won't be sorry.

Randy Cuberly
Title: Re: Magnum wing, second attempt to post.
Post by: MarcusCordeiro on September 23, 2012, 07:41:40 PM: Good job!!
It looks great.
Good to know about the sheeted flaps.

Marcus
Title: Re: Magnum wing, second attempt to post.
Post by: Pat on September 23, 2012, 07:50:53 PM: Randy,

Thanks for the input. Despite having to put some 1/2 oz, glass cloth on the wings in a couple places the wing came up very light to the uncalibrated "hand scale". I am trying to find some other places to shave some weight overall. I hollowed out the wing tip blocks to a PAINFULL thin size so they are nice and light.

Pat
Title: Re: Magnum wing, second attempt to post.
Post by: Randy Cuberly on September 23, 2012, 08:01:38 PM: Quote from: Pat on September 23, 2012, 07:50:53 PM
Randy,

Thanks for the input. Despite having to put some 1/2 oz, glass cloth on the wings in a couple places the wing came up very light to the uncalibrated "hand scale". I am trying to find some other places to shave some weight overall. I hollowed out the wing tip blocks to a PAINFULL thin size so they are nice and light.

Pat

Pat,
Light is good but never at the expense of stiffness and straight alignment. One of my Magnums (the heavy one) flew very well at 65 oz with a Tom Lay ST60. The other weighed 57 oz and also flew well but never quite a good as the heavy one. The difference probably was simple alignment... wing to stab.

Randy Cuberly
Title: Re: Magnum wing, second attempt to post.
Post by: Pat on September 23, 2012, 08:06:24 PM: Being the son of a machinest, I can be VERY nit-picky about square and true. ;D
Title: Re: Magnum wing, second attempt to post.
Post by: wmiii on September 23, 2012, 11:16:24 PM: I would still put in a couple more hinges on each side.

Walter
Title: Re: Magnum wing, second attempt to post.
Post by: Randy Cuberly on September 23, 2012, 11:29:00 PM: Quote from: wmiii on September 23, 2012, 11:16:24 PM
I would still put in a couple more hinges on each side.

Walter

Yeah, I definitely second Walter's recommendation. I typically use 6 to eight hinges per flap with two close together at the tip to avoid any possibility of flutter there. Flutter is rare on CL stunters but is very destructive if it occurs.
Incidentally, Walter had one of the best flying Magnums around. After I flew it I tried to put it in my car but Walter just wouldn't have any of that!!! LL~
I also remember that it had an ST46 that did a great imitation of a 60 in it. I couldn't get that away from him either.

Randy Cuberly
Title: Re: Magnum wing, second attempt to post.
Post by: Gary Anderson on September 23, 2012, 11:46:37 PM: Hi,

Great looking job, are you going to cover the wing with carbon veil?? Some say it doesn't help, others stated its the best thing since cottoncandy?? I use carbon veil and feel it helps if done correctly. Covering the flaps with wood is a great idea, than cover the wood with the carbon veil. The carbon veil is lite and helps fill wood grain and makes the wood stronger. Please show more pictures as you build her, great job.

Gary
Title: Re: Magnum wing, second attempt to post.
Post by: john e. holliday on September 24, 2012, 10:12:48 AM: The wing looks great to me. Listen to them about the hinges.
Title: Re: Magnum wing, second attempt to post.
Post by: Randy Cuberly on September 25, 2012, 11:16:23 AM: Just for grins this is a photo of the hinges on my Gieseke Nobler wing that is much smaller tha than a Magnum.