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  1. M

    Doubling aluminum tube

    Doing a repair job on a plane that uses doubled aluminum tubes. I have the right sizes and wall thickness, and one slides real nice right into the other. My question is though, are they supposed to be bonded at all or will the bolts that go through them be sufficient for holding the doubling...
  2. M

    Rotax Joe

    Anyone have any additional info on this guy? I hear a lot about Rotax Rick and many (although not all, lol) of his customers are quite happy with his engines but I haven't heard much from Rotax Joe's customers. Anyone on here have any dealings with him or have any experience with his engines...
  3. M

    Rotax mufflers

    What happens if I run a 503 muffler on a 582? I am aware that I can cut the muffler to 582 specs (which is what I will do) but I have a buddy who wants to break in his new 582 but has a 503 muffler on it. I want to know if I need to tell him to cut it (or replace it with a 582 muffler) before...
  4. M

    Sleeved tubes vs. thicker walled tubes

    Can anyone help me understand why some designs include sleeved tube construction? I see this mostly on aluminum tube bolt together designs. Is there an advantage in doing this over just using a thicker walled tube? Do you get better strength or flexibility or fatigue resistance or something...
  5. M

    Electronic Fuel Injection for 2-stoke

    Has anyone installed one of these systems on a 503 (or similar engine)? http://www.ecotrons.com/products/2_stroke_small_engine_fuel_injection_kit/ I'm interested in it for both improved fuel efficiency and not having to constantly adjust my carbs between seasons. (I live in Canada and fly in...
  6. M

    Troubleshoot - Rotax C gearbox on a 582

    A friend of mine is having trouble with his 582, probably his gearbox... He runs the engine to full throttle and gets 5500 RPM, then it jumps very quickly to what sounds like 7000 (or maybe even higher - I haven't confirmed this yet though since I've only seen a video) He's running a 68" three...
  7. M

    Gearbox clutch - pros and cons?

    I've seen Hirths and MZs with gearbox clutches and I'm wondering why? What's the advantage? It seems to me that there are a few disadvantages but I can't think of any advantages. The prop will free-wheel with the engine at idle (or off) making your glide ratio worse, and you'd never have a hope...
  8. M

    Fuel tank plumbing

    I'm adding a set of strut mounted fuel tanks to my plane similar to the one pictured. You can see the fuel pickup line coming out of the top of the tank and there's a fuel draincock on the bottom. (picture is cut off but I'm sure it's there) The tanks that arrived here didn't have the hole...
  9. M

    Strut fairing installation options

    I got a set of fairings for my plane to cover the 1.5" lift strut tubes and I'm looking for a non-permanent way of installing them. It looks like most people install them with rivets but I'd like to be able to remove them once a year to check the strut for corrosion and whatnot. I was thinking...
  10. M

    Oil injection fuel pump

    Is this such a thing? If not, why not? How hard would it be to design a fuel pump (either vacuum or electric) to pump a ratio of oil and fuel? We mix fuel and oil by volume, right? Wouldn't a fuel pump that had a two draws, one for fuel (normal sized) and one for oil (50 times smaller) draw a...
  11. M

    Balance Master - any good?

    http://balancemasters.com/ultralights/index.html Seems to be kinda like snake oil... do they really work? I have a 503 that has a bit more vibration than I like. I was contemplating a new 3 blade composite prop to replace the 2 blade wood prop after reading that 3 blade props are generally...
  12. M

    Carb jetting

    Is there a rule of thumb for jetting? Specifically a Bing 54 on a Rotax 503? I live in an area where we get a very wide range of temperatures. We also experience vast swings in humidity. With temps as low as -40C in the winter and as high as +40C in the summer, getting my engine to run in a...
  13. M

    Lean mixture - 2 vs 4 stroke

    Why does a lean mixture damage a 2-stroke but not a 4-stroke? Are 2-stroke engines made with alloys that have a lower melting point? I was taught to lean out the mixture in a Continental or Lycoming to the point where you hear a slight RPM drop and then bump it up a notch or two. I was never...
  14. M

    Off field ops: Beaches and Islands - Video

    Ya ya, I know I posted this down in the ultralight section, but I just wanted to make sure you all had a chance to see it since I'm sure not all of you are into ultralights. I just had so much fun making this video - both flying and editing. I hope you enjoy! -- Neil Diamond provides the...
  15. M

    Octane booster

    I have a plane with a Blue Head Rotax 582 that has a 3/4 tank of gas. It's been sitting for just over 30 days. Rotax suggests that we drain gas that is over 30 days old and re-fuel with fresh gas. I assume that's because the octane drops and the risk of detonation increases. The engine has oil...
  16. M

    Forced landing checklist

    I've been flying for the better part of 2 decades and much of that has been in GA type aircraft. I had plans on becoming a commercial pilot but stuff happened and I became a weekend warrior / fly for fun type pilot. Then it got super expensive and I had to give it up. I recently got back into...
  17. M

    Engine failure just after take off - video

    Engine quits just after take off - video Full disclosure: this was completely my fault. I am already aware of the mistakes I made and have learned from them. I am posting this that others may learn from my experience and not make the same mistake(s) I did. Please keep your comments respectful...
  18. M

    wrong thread - please delete

    my bad
  19. M

    Fender options for wheels

    I recently had the real world teach me a pretty valuable lesson. I have a small airplane that I like to operate in short, soft, and off field locations. Up until recently, all of those locations have been turf of some sort or another. A few weeks ago I discovered some gravel pits that had plenty...
  20. M

    Rotax 503 - one cylinder running rich

    I double checked all the jets and other parts in my carbs and I've got them synched as closely as I can by eye but the rear cylinder is running over 100 degrees cooler than the front one. The spark plugs look as they should; the front one is a nice tan (EGTs are about 1125) and the rear one is a...
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