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  1. D

    Brock's BR-5 Mini-Goose

    BR-1 Triver-Dog(nose sticks out for CG) WIG I've decided to stop work on my pet engine project for now (see bts74) because I suspect it might take another 5 years to get working. I've also scraped the mini-Grumman-Goose-like design with twin engines mounted on the wing with counter rotating...
  2. D

    Brock's BR-5 Mini-Goose

    I've been trying to hammer out some of the design details of my plane so I can get started on building a 1/4 scale remote controlled model. After doing some calculations it is clear I need to use high lift device(s) to get a reasonably sized wing and landing speed. Since this is a low and slow...
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    High Lift Airfoils for Slow Plane

    Overall impression is most people don't think a high lift airfoil is a good idea (heavier controls/less stable). I was planning on a fibreglass wing but I wasn't thinking of a laminar airfoil. I wonder if going another way such as Junker style flap(s/erons) would be a better idea as very high...
  4. D

    3-Piece Wing

    Guilty as charged. I had thought of using lag bolts which seemed like an easy way to do it but I had wondered if it was a good idea. If I use bolts with a hole straight through the spar the spar would be a little weaker since more material is removed but it would be easy to use doublers. Using...
  5. D

    3-Piece Wing

    I'm considering using a 3-peice wing since twin engines are mounted to the stub section or else I would use a 2-peice wing with a tongue and fork connection inside the fuselage. Anyway I've seen a few designs and I am considering a solid wood stub spar that the wing panels lag bolt to from the...
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    High Lift Airfoils for Slow Plane

    I'm been considering a moderately high lift airfoil for a non-flapped slow flying airplane that cruises around 120mph and lands at 50mph. Although some airfoil have very high CLs (Coefficient of Lift) topping out at around 2.5 on X-foil they also have a lot of drag as well as being unsteady at...
  7. D

    Brock's BR-5 Mini-Goose

    I’ve decided against designing and building my own airplane. I’m not an aero engineer and feel uncertain about how safe moldless fiberglass construction would be when an amateur does the design. Brock
  8. D

    3-piece Wing With Pultruded Carbon Fiber (PFC) Spar Caps

    Thanks for the nice video. The Stemme folding wing seems ideal although a bit of a challenge to build. Just curious but does the Stemme use a tube in a tube dog bone type control system connection? If I didn't want an amphibean and if I didn't want to design my own plane I would seriously...
  9. D

    3-piece Wing With Pultruded Carbon Fiber (PFC) Spar Caps

    I am wondering if anyone has any ideas on how to go about building a 3-piece wing with PCF (see The Official Site of Marske Aircraft Corporation) spars. I'm basically make a twin box spar wing with the PCF spar caps wrapped in fiberglass then the entire spar is wrap in glass for the shear webs...
  10. D

    Brock's BR-5 Mini-Goose

    Well, it's been quite a while since I updated this. After wanting to get started and not having the funds to wondering if this would be a better project in 20 years: I have decided to get started on it this winter by building the small parts inside. I have decided that the amphibious option with...
  11. D

    Light-Twin Flaps

    I was wondering if their is any secrets to how the flaps are designed for wing mounted twin engine airplanes. Would the flaps perform similar to slotted flaps since they are blown from the propeller? Brock
  12. D

    Effect of Windmilling Propeller on Tail

    I wonder how much blanketing (slowing down of the air) of the tail would happen with a windmilling propeller. A wind powered propeller has the bottom of the airfoil facing the airflow and is around 30% efficient (50% theoretical). An airplane propeller would be less efficiency so not a huge...
  13. D

    Possible to Scale Seawind?

    Okay I understand now. Since the propeller is so close to the tail a plane like the Seawind could probably use a tiny tail but can't in case of an out engine. Brock
  14. D

    Possible to Scale Seawind?

    After come consideration a mini-Seawind probably isn't a good idea for a number of reasons and a typical engine-pod above the wing is more practical approach for the plane I had envisioned. Why is their blanketing of the elevator with an out engine? I can see why the plane pitches up (since...
  15. D

    Possible to Scale Seawind?

    I'm interested in scaling down a Seawind to 1200lbs gross, 90hp, twin side-by-side seating. I had originally planed for retracts but I don't think that's possible given the weight restriction (not to mention the complexity). This airplane is more of a novelty since it is slow flying with a...
  16. D

    Proposed Engines

    This winter I plan to get started on my two-stroke horizontally opposed engine projects. My quest is basically to see how simple an engine can be built and if simply scaling up model airplane engines (my main source of information) can be done. My goal this winter is to build a twin cylinder...
  17. D

    Brock's BR-5 Mini-Goose

    I found a major mistake in my original drawing as I had the placement of the step well behind the CG (about 45 degrees where 2-9 degrees is typical). I had just drawn the step behind the lower wing in a convenient place but after reading an article in Sport Aviation on seaplanes I discovered...
  18. D

    Brock's BR-5 Mini-Goose

    After looking at various airfoils (thanks to Orion for his article in Sport Aviation, Why That Airfoil? Feb 1992) I've decided to use a AS5045 airfoil that was developed for the KR series of airplanes. It has a fairly high CLmax of 1.7 and only 37 drag counts and performs better than the NACA...
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    High Lift Airfoils vs. Bigger Wing

    I am not very good with definitions but I think just induced or vortex drag. Parasite drag = preasure + friction drag = .02-.055 is typical for light planes. Brock
  20. D

    High Lift Airfoils vs. Bigger Wing

    I don't think TLAR airfoils are very good as they tend to be draggy and are only suitable for very slow flying airplane where performace doesn't matter and a steeper approach may be benifical. Brock
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