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  1. R

    Quickest way to build a Rag and Tube Biplane

    Excellent input all! The gist of what I'm reading is that there's room to streamline construction with: 1. CNC cutting wood: minimal time savings but points on making an accurate the first time (with a dialed in machine, correct CAD files of course) 2. Tube kit (notched): Probably the most...
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    Aerobatic Tandem Two-Seater

    Baseline Cowling Flow study (no baffles)
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    Quickest way to build a Rag and Tube Biplane

    Hey guys, Currently a hypothetical as not seriously looking into building one and was debating posting this in the General Question but decided on here as there might be discussion of new technology. So say I wanted to build a Stolp Starduster Too: Tube fuselage and wooden wings with plywood...
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    Why isn't the push/pull twin more popular ? What you say.

    This airplane seemed to have the single engine reliability, was fast, and had looks that killed (literally for its intended victims and its pilots): All kidding aside, I think the answer to Pop's question is more fundamental to anything technical: People who own twins want speed, carrying...
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    The state of our (dying) sport 2022

    Can confirm. I don't own one but I borrow a family member's a lot...they're just nice cars! I hate to speak for all Asians (but will anyways because there' probably like 5 of us on here) and this is a bit anecdotal, but I think it's more than a little cultural: There seems be an obsession of...
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    The state of our (dying) sport 2022

    Anecdotal evidence aside, if you look at the FAA's Pilot Demographics there are just as many pilots in the 30-40 age range, which I'm part of, as in the 40-50 and 50-60 ranges. 70+ starts dropping off because of age and 20-30 is lower because people are still figuring out other parts of their...
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    Concepts only: Doodles without numbers

    That's easy....Just make it so cramped that no one wants to sit in there! Obligatory 4 Engined Version with four IO-360/540...just in case you have too much money for gas
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    Concepts only: Doodles without numbers

    Concept Taildragger Twin....inspired by a certain WW2 bomber: Also, for those wondering on the size difference:
  9. R

    Concepts only: Doodles without numbers

    Well, there are three technical and two philosophical reasons for this: On the technical side: As this a monocoque structure, the intent is to provide a smooth load-paths on the exterior of the fuselage and the best way to do that is to fasten each panel tangentially to the edge of the...
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    Concepts only: Doodles without numbers

    Scott, interesting perspective! However, the fuselage in the new shape isn't flat, it's just bulged in a different direction. In the old shape, it was curved in vertical/lateral plane (like cross section of a tube) with the transition piece (shown in red in the first picture) curved both in...
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    Concepts only: Doodles without numbers

    Some sheet metal design studies: So I've been trying to eliminate compound curves from all load-bearing structures (cowling and fairings excluded) in an attempt to lower manufacturing complexity. That and I don't entirely trust monocoque structures to withstand loads with compound curves as...
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    Aerobatic Tandem Two-Seater

    Was just thinking about that and why I revised it: For the front: Unlatch, Pull hinge, Roeger Hook -> Canopy front lip is pushed up to catch the airflow and Roeger hook prevents it from sliding straight back to hit the pilot in the face. For the rear: Pull hinge, unlatch, hinge stays...
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    Aerobatic Tandem Two-Seater

    Thanks for the offer, but I have my own spreadsheet that calculates the preliminary sizing info (such as the aerodynamic surface areas, tail volumes, static stability). That data is then combined with weight distribution to provide both static stability and stability derivatives. The stability...
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    Aerobatic Tandem Two-Seater

    The tail was highly oversized in the last version and both the vertical and horizontal tail volumes are closer to “average” GA aircraft values. That VT was probably twice as big as it needed to be...what is lost, however, is "area under the horizontal stab" which I suspect aids a lot in spin...
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    Aerobatic Tandem Two-Seater

    Unlike many of us during this holiday season, the design is going on a diet! Shrunk length from 27ft long to just a tad above 25ft. Narrowed the cockpit from 30" to 28", which I think is the line between feeling of sportiness and feeling like flying a tub. Unfortunately, it's going to force me...
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