Allen Sutphin

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About Allen Sutphin

  • Rank
    Advanced Member
  • Birthday 09/10/1955

Profile Information

  • Gender Male
  • Location Webster Springs, WVa
  • Interests A&P, flyer, builder,

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Allen Sutphin's Activity

  1. Allen Sutphin added a post in a topic Engine   

    Yes, but not as much as before. Too many irons in the fire. He went to Sebring Monday for the LSA show. He has a couple of good people working for him now. He now owns Stewart Systems, plus has a repair shop #2 in the Midwest.  But still has time to answer any questions one would have.
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  2. Allen Sutphin added a post in a topic Engine   

    Oil injection has been used on outboards for years and most 582's use oil injection. But it has to be set up properly. No proof exist (yet) that oil injection causes any kind of bearing wear or failure. Just my opinion and I haven't used it. Would be hard to prove that it causes any problems anyhow.
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  3. Allen Sutphin added a topic in Two Strokes   

    Got my engine delivered to Heavenbound Aviation today and got to look around in the engine shop for a while. An interesting observation was the number of 582's in his shop for rebuild. Must have been a half dozen or more in various stages of repair. I did notice several 582 cranks that were either worn out or destroyed bearings. I didn't ask about the # of hours on them. I only noticed 1 Hirth in the shop for gearbox repair. Either that means there are 10 times more Rotaxes out there than Hirth, or Hirth is more reliable. I tend to think there are that many more 582's out there which in turn means more overhauls. Most were for lower end problems on the crank. We talked about that and both seem to agree that oil injection could be a factor. I'll explain my theory on that. The oil injection nozzles is located close to the crankcase inlet so the oil and gas does not have time to mix well before entering the crankcase and does not get into the outer ends of the crank. Oil being heavier than gas so it gets to the crank near the intakes and the gas gets to the end bearings, where as pre-mix gets circulated throughout and deposited on the whole crank. This may be all hogwash, but it sure sounds reasonable. That's my story and I am sticking to it.
    • 4 replies
  4. Allen Sutphin added a post in a topic Sealer used for fuel fittings ect.   

    Pretty much the same stuff. Haven't seen the old stuff for a while, may no longer be available. Seems anything that works good, isn't around long.
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  5. Allen Sutphin added a post in a topic Sealer used for fuel fittings ect.   

    It really never gets hard, always sticky.
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  6. Allen Sutphin added a post in a topic Sealer used for fuel fittings ect.   

    I've been using that aviation grade Permatex form-a-gasket for over 25 years. It always works on fittings.
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  7. Allen Sutphin added a post in a topic Issues flying behind a 2-stroke   

    You got the right attitude! Just have fun and fly safe!
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  8. Allen Sutphin added a post in a topic Wind   

    My rule is try to keep it below the "this is gonna hurt" moment. And I don't like much pain anymore. Old age has that covered.
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  9. Allen Sutphin added a post in a topic Hirth   

    That was a sweet deal! The Hirth 55 hp is a good solid engine. I have 1K in mine but have to buy a gear box and prop so it works out to a tad more than yours. Its got 37 hrs TT on it but I always have one gone thru before I stick it on an airframe, even though I know this engine from day one of its life. The 65 hp is the same engine just 800 more RPM to get 65 hp. 1000 TBO but recommended teardown and reseal at 500 hrs. And contrary to hangar talk, several have gone beyond 1000 hrs without failure. Unless they were murdered. But we need to take hangar talk with a grain of salt. Just like I unintentionally insulted someone, my brother's girlfriend's uncle had a Hirth and it wasn't worth a darn. We all know the stories. In place of Hirth, add oil, props, airframes, or about anything else related to flying. Most who have been involved with Avid/Foxes know what does work and what does not by now. Unless something new comes along.
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  10. Allen Sutphin added a topic in Two Strokes   

    Hopefully making a road trip tomorrow to take my engine to the Hirth dealer in Ohio to have it gone thru and a gearbox installed. Done away with the fuel injection system and going back to carbs. Also going with the carbon fiber air shroud which is a lot lighter and not prone to cracking. Biggest problem is going to be reversing the fan so it pulls air from the front to the rear instead of pushing it forward. Engine was 71 lbs without exhaust and gearbox. Should come in at around 100-105 flyable. Was running 2.5-3.0 gph at cruise so expecting 3-3.5 gph with carbs. Should perform somewhere between a 503 and a 582 with 55 hp and 53+ pounds of torque.  Has a pretty flat power curve down to 4000 rpm from max 5500 rpm. Should work good in a light model 2.
    • 2 replies
  11. Allen Sutphin added a post in a topic Wind   

    That's exactly what happens here. I have a treeline that I climb above on take off. As soon as I clear them, yeehaw!  Works better than Exlax!
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  12. Allen Sutphin added a post in a topic Wind   

    Around here I've never seen a steady wind over 7-8 mph. Always gusts. There isn't much training for flying in gusting, swirling, washing machine type winds, outside of just trying to maintain control the best one can. And a lot of times, you are just a passenger with a stick in your hand. Not for me!
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  13. Allen Sutphin added a post in a topic Wind   

    I just watched a 20 mph wind (according to my weather station) take down my flagpole. Around here, flying a 450-500lb airplane would be suicide in this. I'll leave this flying to you good pilots. Not for me!  I might have been born in the dark, but it dang sure wasn't last night. At my age, nothing I need to prove anymore. I'll stay in the chicken house.
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  14. Allen Sutphin added a post in a topic Confused?   

    Generally in the building/ rebuilding process, one would do a pre W&B before final installation of the battery. It is one of the easy things to move to adjust the CG where one needs it. I have had some aircraft that was so CG sensitive that you had 2 battery locations, one for single place and a rear one for two people.  That comes into play a lot in some tandem seating aircraft where CG is limited. Side by side are a little more forgiving in certain aspects but still important.  Same applies to us skinny #&% pilots as well as some slightly heavier pilots, you know the ones who wear the new designer jeans, Lardache.
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  15. Allen Sutphin added a post in a topic Issues flying behind a 2-stroke   

    Sounds like you have a plan! Good Luck and we'll wait to hear the results. Just remember, the wheels stay on the bottom !
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