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  1. NorthwestJack

    I will miss Orion!!!

    for all of you who have appreciated Orion's contribution to this forum: I have sad news of his passing last month due to an illness with cancer. I am a member of EAA 84 which meets at Harvey airport in snohomish ,Washington. He had a shop/lab/office at the airport where he did a lot of design...
  2. NorthwestJack

    Prop effiicency vs. RPM

    Im in stuck with a problem: I purchased an Aerotwin engine 4 cycle 4 years ago. Two inline cylinders, turbocharged that puts out 65 continuous and 75 for a brief period of time. the problem is that their reduction drive is not working , and its been under development for years. ( so I dont have...
  3. NorthwestJack

    Help!! Cant seem to get off the ground

    I added a new engine, my son. He pushes real hard but i cant seem to get the goshdarn thing airborne. Do i need a new airfoil? Mayby myCG is way off. I know, My Tail feathers arent large enough. Ill try doing another stability calc. to see if I need mor weight in the nose? What do you think?
  4. NorthwestJack

    Wood ,Fabric Tandem 2 Seater

    Ive been working on a two seater, wood and fabric airplane with plywood covered cantilever wings, of my own design, for five years. I am 95%; complete . Should be test flying this spring. I designed it to be bomb and idiot proof. Slow flying, +- 6 Gs. Im getting older and my flying is not as...
  5. NorthwestJack

    VORTEX GENERATOR USE?

    I am building a 2 seat airplane ( see under wood construction) , but My question has to do with vortex generators. I recently flew in a GlaStar and the pilot flew the airplane until it stalled. At that point the airplane was bobbing up and down , barely flying , however the pilot still had full...
  6. NorthwestJack

    Wooden landing gear test

    Well i finally managed to test my wooden landing gear. it seemed to handle 3G's without any problem so I probably overdesigned it. This unfortunately made it about 8 lbs. heavier than an aluminum landing gear of similar strenght. You can see my test rig in the following pictures. I used the...
  7. NorthwestJack

    Moment Coefficient Values?

    In designing my airplane I have taken into account all the references to pitching moments which I have encountered in this forum. For example the penalty for using a highly cambered airfoil or a laminar airfoil gives no significant advantage in lowering Cd because the increase in pitching...
  8. NorthwestJack

    2-Seat low and slow

    Hello: this is my first post. Im in the final stages of building a two seat version of a mini-max. I like the open cockpit , slow and low flying. One of the features of the minimax that I did not like was the high drag due to all the struts for the wings, landing gear and tail. So I decided to...
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