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  1. 32fordboy

    Ryan ST replica performance data

    Our Phase 1 testing was finally completed yesterday, so it felt appropriate to share the testing details. It's funny how the plane matured as a design. The initial goal was a to have a plane that was extremely light with an empty weight of less than 700 lbs, powered by the little Mikron...
  2. 32fordboy

    Timber Tiger Ryan ST replica to be at Oshkosh AirVenture 2018

    We'll have the Ryan ST replica at Oshkosh again this year. This time we'll be in the kit vendor area, booth #644. We won't be selling kits until the prototype has flown off the required hours, but we are already reserving serial numbers. Given the overwhelming response at AirVenture 2017...
  3. 32fordboy

    Ryan ST Light Sport – Nick Pfannenstiel – Brighton, Colorado

    LSA Ryan ST replica, 95% scale Thanks for checking out my 95% scale Light Sport Ryan ST replica update thread! About 8 years ago, I set out to design a light sport Ryan ST replica. It wasn’t an easy road of learning and researching. This project is going slow, but at least I’m starting to...
  4. 32fordboy

    Shortening Piper Cub spar depth

    I'm working on a high-wing, strut-braced design (33.2' span, 1320 gross, +6/-3 ultimate) and have a quick question regarding spar cap material. I really like the "E" shaped cap used on the Piper line. Problem is, I can't seem to find any suitable extrusions. The spar height is (don't have the...
  5. 32fordboy

    AMC Jeep 4.0L Inline 6

    Has anybody pondered the use of a Jeep 4.0L Inline 6 as an airplane engine? I'm in the unusual position of needing a heavy engine that can swing a relatively large prop on an as-of-yet unbuilt WWI fighter. The engine, in stock form puts out 230 ft/lbs of torque at 3000 RPM. They also make...
  6. 32fordboy

    Biplane center section aerodynamics

    Now I thought I read something significant about airflow over biplane center sections (maybe lift interuption due to the proximity of the fuselage?), but can't find the source. I am trying to find out if there is a major lift difference in trailing edge cut-out vs no trailing edge cut out for a...
  7. 32fordboy

    Minimum tube diameter-practicality beats engineering

    Going through my sets of steel tube airplane plans, I notice the tail diagonals on the lighter planes is usually .035 x 5/8th diameter tube from the base to the tip. Many of these planes probably have far smaller loads on those tubes than the 5/8 can take. Now, I haven't gone through the...
  8. 32fordboy

    Chord shear vs wing drag

    I'm looking at results on the Willford Airloads worksheet, particularly at Condition A. For this 1320 lb plane at 3.8 limit, the wing drag here is listed as 356 lbs (I assume over the entire wing, not half span). Why is it that the chord shear at the root is -317 lbs (half span)? I thought...
  9. 32fordboy

    LSA Manufacturing regs

    I have been thinking a lot lately about maybe starting an LSA kit business. Does anybody know where I can find manufacturer requirements and regulations for here in the US? Things that I'd really like to know is what kind of engineering and static testing rules there might be. Would we have...
  10. 32fordboy

    Biplane Airloads Spreadsheet

    I've been messing around with yet another wing layout, this time a biplane, very similar (almost identical) to a Hatz wing layout. Using Neal Willford's Airloads-Fabric spreadsheet, how would one enter span/chord/wing area data for a biplane? My wing area is 170.7 sq ft, 25.75' span, 4.17'...
  11. 32fordboy

    Quick question on EAA/Sport Aviation Software

    I've been messing around with Neal Willford's spreadsheets lately, just trying to learn some new things. They are very cool to experiment with. Quick question, though: On the S311-AC Design-Tails worksheet, I have a wingspan of 26.4 feet, about 30 inches of that is fuselage (it's a low wing...
  12. 32fordboy

    Triangular load forces

    I am working on a landing gear frame that has a known vertical force on it, but I am uncertain how to figure out how the load is distributed into the various parts. Attached is a diagram of what I am trying to do. Estimated (for the time being) measurements are included, but the drawing is not...
  13. 32fordboy

    Flying wires and load distribution

    I'm working on a design project and have a quick question for those of you who are more experienced than I. I've read somewhere that flying wires should be doubled up, which is the case for most planes that utilize them. But how do they determine the tension on those wires relative to the...
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