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  1. M

    comparative weights

    StrangeDays If you increase the foam thickness you increase the stiffness of the structure. Strength is unaffected. The outer glass layers will carry the majority of the load. Increasing the thickness is great way to optimize weight while acheiving a specified stiffness. If the section...
  2. M

    Roll Call

    Cozy MK IV plans owner, but currently building a row boat.
  3. M

    E-Racer thoughts/opinions?

    Chanler, You might want to ask this question to the good folks over on www.canardaviation.com. Per your questions Yes you park it on its nose to protect it from flipping backwards. This is not an issue though. Its easy to do. If you fly alone you may have room for clubs. With two...
  4. M

    What to build?

    Kyaphas, I am also in the cozy camp, but to me it sounds like you should be the RV7. (or have you seen the latest 4 seat RV!!?) The cozy can fly inverted and such and do minor acrobatics moves, but it is not rated as an acrobatic plane and there are several limitations to what it can do...
  5. M

    Electric power

    I have heard that the mantainance costs for tidal generators are enourmous. The growth of marine organisms on the machinery is difficult to keep up with. I think the overall cost to produce the energy is much higher than other energy generating methods. (I saw this on a discovery channel...
  6. M

    Lifting Tails?

    The express planes are a great plane, but the cost to fly is much higher than the plans builts canards. (Although similar to kit built canards) Now if the express could be built from plans then it may be an option.
  7. M

    Lifting Tails?

    Orion, I think Greg Richter put the jet on his Cozy mostly because he wanted something different and he could. Being different and being the first is important to some people. I don't think range was a big concern of his. Also I don't think he has ever posted details of his performance...
  8. M

    Lifting Tails?

    Cozyjet? Yes of course :gig: http://www.bluemountainavionics.com/greg/aircraft.html
  9. M

    Riveting noise

    Orion, you are right the numbers I threw out on the top do require qualification. I expected that you would flame me a bit for that. I was just trying to throw at a few quick figures without exagerating too badly. Mostly I was trying to beat Dust to promoting the Cozy. BUT he didn't even...
  10. M

    Riveting noise

    What about the Cozy? www.cozyaircraft.com cozy vs. RV10 both seat 4 cozy top speed 215 MPH, RV10 200 MPH build time cozy 3000 hours, RV10 2500 hours range cozy 1000 Nm, RV10 950 Nm finished price RV- 10 - $70,000 - $100,000 Cozy - $30,000 - $60,000!!! :ban: and finally noise...
  11. M

    2 stroke diesel

    I saw an interesting engine concept at the SAE show in detroit last week (yes I'm an automotive engineer). It was a 2 stroke diesel with 2 pivoting cylinders. It produces 120 Hp and utilizes the Rotax 951 crankcase and crankshaft (marine engine). There seemed to be a lot of innovation...
  12. M

    intake manifold material

    In a NA application the manifold is less than 14.7 PSI. Air must move from the atmosphere into the manifold. Thus the manifold is at a lower pressure than the atmosphere. ~10 PSI at sea level. The pistons are an air pump that pulls the air in. The effect is highest at idle when the air flow is...
  13. M

    fabricating an engine mount

    Any time you go through a phase change in steel you have the potential for distortion ... ahhh go out of whack :gig:. The worst phase change for distortion is from austenite to martensite (rapid cooling from high temps). Martensite formation is almost an explosive phase change that results in...
  14. M

    fabricating an engine mount

    Okay now we are getting somewhere. But as in most cases we must move farther. chrome moly (41xx) is an alloy steel that is easy to get good structural properties. You didn't specify the grade but I will assume 4130. Don't choose anything higher than 30 carbon as the 4140 and 4150 steels tend...
  15. M

    fabricating an engine mount

    Dust, This is one of my areas of speciality. Mild steel will go through a phase transformation to either martensite or pearlite in the "HAZ" (heat affected zone) depending on the exact type of steel and how quickly it is cooled after welding. A pearlite structure is fine for your...
  16. M

    intake manifold material

    If you are serious about trying to use titanium you should get a hold of Timet. They are a titanium supplier I used to work with on a titinium automotive spring. I can give you contact information if you need.
  17. M

    intake manifold material

    Here's what I can find on 3AL-2.5V Titanium Alpha-Beta Alloy Composition C - 0.02, Si - 0.06, Ni - 0.007, Al - 3, V - 2.5, N - 0.01, Ti - Bal Density = 0.166 lb/in^3 @ 70F Melting range 3050 - 3150 Linear expansion 50 F - 1200 F = 5.3 - 5.5 x 10^-6 in/in*F Modulus = 70 x10^6 PSI...
  18. M

    Shops open for business

    Dust, Thanks for invitation. I'm afraid working with you saturday might convince me to try to start my own. Lets see 1 hour a week working ... hmm maybe 3000 hours to complete the plane. HEY I'll be flying within (... carry the one ...) 60 YEARS! Great that way I'll have time to get my...
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