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  • July 14, 2025, 01:50:32 PM

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61
Open Forum / Re: 2025 Nats Qualification Groups, scores and final reports
« Last post by Ken Culbertson on July 12, 2025, 06:13:44 PM »
I don't know of any serious flier that doesn't build their own including for many even the design.  The exception might be wings blanks, especially foam.  Personally, in 60 years at the "expert" level I have only built two planes where I did not build the wing and both were situations where I needed to get into the air quickly and did not have a shop.  Do I see it a problem, no.  The rules allow a major component to be built by others and still comply.  Nobody should look down on anyone following the rules.
I do it simply because I like building and I want to build the wing. 

Ken
62
Open Forum / Re: 1/2 a Spectra line size?
« Last post by Colin McRae on July 12, 2025, 06:06:04 PM »
Quote from: Dan McEntee on July 12, 2025, 03:26:01 PM
   But just weigh the airplane and the pull test if still 10Gs. So a 10 ounce airplane is 100 ounces. Divide that by 16 and you get 6.25 pounds pull test.10 pound line should be fine

 Type at you later,
  Dan McEntee

And don't forget a model pull test is pulling on 2 lines, so on the example above each line is only loaded to 3.125 lbs. A safety factor of over 3 for 10# rated Spectra.

63
Open Forum / Re: 2025 Nats Qualification Groups, scores and final reports
« Last post by Dave_Trible on July 12, 2025, 06:04:13 PM »
Quote from: Dan McEntee on July 12, 2025, 03:33:53 PM
  I saw a video on FB of the models spread out at the appearance judging and near the start of the video, near the camera, was a profile P-40 model done all in silver. Does anyone know anything about that airplane, who the pilot was, and any other det6ails of the airplane? Thanks in advance!

  Type at you later,
   Dan McEntee
Dan I don't recall any PROFILE P40s there.  My silver P40 full fuse airplane was there.

Dave
64
Open Forum / Re: Tom Dixon Trim Seminar part 1
« Last post by Richard Fleming on July 12, 2025, 05:58:34 PM »
Thank you taking the time to record this and for sharing Will. Excellent information.
65
Open Forum / Re: ID this Stunter by Patrick Rowan?
« Last post by Paul Taylor on July 12, 2025, 05:58:20 PM »
66
Open Forum / ID this Stunter by Patrick Rowan?
« Last post by Paul Taylor on July 12, 2025, 05:57:23 PM »
Rick picked up this plane at Brodak’s and no one could ID it at the field.

Anyone have a clue what it is? His own design maybe?
67
Open Forum / Re: 2025 Nats Qualification Groups, scores and final reports
« Last post by Brett Buck on July 12, 2025, 05:55:42 PM »
Quote from: Rusty on July 12, 2025, 07:33:33 AM
Congratulations to all who competed. 

I sure missed the live streaming.

Question:  Is there anyone who did 100% of the work building their plane?

Rusty

    Depends on how you define “100%” I can’t speak for anyone else, but I built everything that isn’t traditionally defined as “hardware”, and at least some of the hardware. This includes designing it, drawing it,cutting the foam wing and tail, and most of the control hardware.

I would guess almost everyone did the same, a few probably pushed the boundaries of the current CLPA BOM definitions. A few, including the Concours winner, have build threads here, you can see exactly how it was done.

     Brett

68
Open Forum / Re: 1/2 a Spectra line size?
« Last post by Colin McRae on July 12, 2025, 05:51:07 PM »
To keep it simple, this is right from the AMA:

Model wt oz    Engine size     Watts     Rated Spectra lbs

     24                  .09             300            20
     40                  .25             450            40
     64                  .40             600            60
     75                  .75             750            100


I use 20# for 1/2A even though its overkill.

Colin
69
Open Forum / Re: 2025 Nats Qualification Groups, scores and final reports
« Last post by Dan McEntee on July 12, 2025, 03:33:53 PM »
  I saw a video on FB of the models spread out at the appearance judging and near the start of the video, near the camera, was a profile P-40 model done all in silver. Does anyone know anything about that airplane, who the pilot was, and any other det6ails of the airplane? Thanks in advance!

  Type at you later,
   Dan McEntee
70
Open Forum / Re: 1/2 a Spectra line size?
« Last post by Dan McEntee on July 12, 2025, 03:26:01 PM »
Quote from: kevin king on July 12, 2025, 12:25:41 PM
Can someone please tell me the Spectra line size for 1/2a please?

   Steve is correct in his assessment. But just weigh the airplane and the pull test if still 10Gs. So a 10 ounce airplane is 100 ounces. Divide that by 16 and you get 6.25 pounds pull test.10 pound line should be finem and I agree with Steve on getting the genuine article from the local Bass Pro Shop of Cabela's. They seem to restock fairly frequently but they have ordered yellow for me when I wanted it for free delivery to the store. I'm flying my .061 Doodlebug Brothers airplane on 10 pound line now and I'm up to 47 feet. I can't imagine flying this on that long  of .008" steel lines!! They would be a nightmare to take care of !!!

 Type at you later,
  Dan McEntee
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