I', trying tothink of the name of a more modern 1/2A twin stunt model that I may have plans for but want to see if I can find a file f or them, but can't remember the name!! It a sorta look aloke to the Grumman Skyrocket I thing, but more rakish looking. I thought it was Blackhawk or something like that but searching isn't turning anything up. My plan files are kind of blocked off and I can't really dig into those until I straighten up the mess, but want to look over the plans and do some head scratching. I have no idea as to the designer, only remember that it's a twin engine, twin rudder, and resembles the Grumman Skyrocket, I think!! Any help will most certainly be appreciated!!
  Type at you later,
  Dan McEntee

You're thinking of the deBolt/DEMECO 1/2 A twin...I believe it was advertised as the "A/2".  Used twin Wasp .049 engines with internal tanks.  Far from modern...was designed way last century.  Darn cute!

Cheers.

Warren Wagner

This one?
https://aerofred.com/details.php?image_id=97548

Also see https://rcbookcase.com/details.php?publication_id=458 just in case you may have the magazine.
Model Airplane News December 1980 pages 49-52, 58

   THAT"S IT!!!! Winner winner Chicken Donner!! I guess I was correct on the name, and some of the gray matter is still functioning!! . My main curiosity was the size/wingspan. It's bigger than I thought. I have the plan for the DeBolt 1/2A Twin that looks similar, but it's only 26 inches in span. I want to use two, Cox engines from the last batch they were selling off. The one on my Baby Clown, the one that kept eating the stainless reed,  has shown really good power, and I think they will fly this. I might just enlarge the DeBolt model to 30" and whip that out and see how they work. I have always wanted to a twin, of any kind, and this may be the year!!

  Thanks again Mr. Jim!!
   Dan McEntee

Dan,

That looks like a fun project!

From the twins I have seen (and scaley things with up to six Cox engines) the torsional stiffness of the wing between the engines is critical. If the engines excite a wing resonant mode, you can't seem to ever get them set right and they toggle back and forth into the resonance. But if the wing is stiff and you can get them both synch'ed up it is really cool....

Dave

Mr. Dan, I love twins!

I figured you may want some inspiration. I seem to remember passing some messages with the builder a few years back. His is nose heavy with Golden Bees. I'd do horseshoe backplates and external tanks in the nacelles.

Quote from: Dave Hull on May 12, 2026, 05:13:10 PMDan,

That looks like a fun project!

From the twins I have seen (and scaley things with up to six Cox engines) the torsional stiffness of the wing between the engines is critical. If the engines excite a wing resonant mode, you can't seem to ever get them set right and they toggle back and forth into the resonance. But if the wing is stiff and you can get them both synch'ed up it is really cool....

Dave

   I found an old thread while searching by Jim Lee, and I think it was the Debolt model that he experienced that with, and his broke up in flight the last time he flew it years ago! I plan to address that by adding some spars to the wing, and extending the center section sheeting out to the same length as the bottom. That shouldn't change the airfoil, and since this model is OTS legal, I don't think I'll get dinged for it. I wonder what they had against spars back then!!?? I think that ought to box things in better.  I think 5" diameter props ought to help run things a bit smoother. I think I can whip one of these up pretty quick as it is presented, and maybe even enlarge it to 30" span  for giggles and grins. I hope to maybe cut some wood this weekend.
  Type at you later,
   Dan McEntee

Quote from: 944_Jim on May 12, 2026, 10:30:24 AMThis one?
https://aerofred.com/details.php?image_id=97548

Also see https://rcbookcase.com/details.php?publication_id=458 just in case you may have the magazine.
Model Airplane News December 1980 pages 49-52, 58

    CORRECTION!!! The scale at the bottom of the print is wrong. It starts at -1" and then progresses to 0, then 1 through 6" and from o to 6" is about an inch short. So there is something wrong with the download file from AeroFred. I'm lousy with math and don't know the percentage but guessing it's about 10", maybe?? I'll try contacting the site and see if they respond.

    There is something wonky about that plan file. I down loaded it from the Aerofred site directly. I went to Fed-Ex Office to run off a copy, and it comes out with the scale at the bottom measuring 6", but the model is smaller, like 31" as opposed to the 36 3/*" that the title block calls out. I'm not that disappointed, because that's one thing I was thinking of, reducing it to about that size to use the reed engines on! I gotta pull the magazine and read the article, and then clean up the pile in front of the plans file and look for the paper copy I think I have and see what it looks like. Just want to point that out to anyone else looking at it.

   On another plans site note, one of the latest issue of Aeromodeller had a quick blurb in it about the Hip Pocket aeronautics plan site being taken over  and is back up and running. I think for short they call it HPA3.0 and a search of that may turn up the site. Otherwise I have to hand copy the web address by hand and then see if it works. If it does, I'll post a link here.

   Type at you later,
  Dan McEntee

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