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About preventec47

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  • Birthday 01/01/1960

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    Atlanta, GA
  1. What is Endurance Limit (Se)? - Definition from CorrosionpediaEndurance limit (Se) is the stress level below which a specimen can withstand cyclic stress indefinitely without exhibiting fatigue failure. ...Endurance limit is also known as fatigue limit. Fatigue Limit | Definition of Fatigue Limit by Merriam-Webster https://www.merriam-webster.com/dictionary/fatigue%20limitDefine fatigue limit: the highest stress that a material can withstand for an infinite number of cycles without breaking —called also endurance limit.
  2. I am a member of an airplane club where the majority of the members are employees of Lockheed Mfgr in the town of Marietta, Georgia USA. Several of these guys are engineer types and several years ago one of he guys gave a lecture about fatigue and different materials specifically the different common aircraft alloys of aluminum since aluminum was being used to build 5 or 6 different planes in the club. An Important takeaway I remember is an amount of stress called the "endurance limit" ( I hope I remember this correctly ) and at that amount of stress and lower the aluminum incurs zero fatigue buildup. The presenter explained that although it may be engineering overkill .... whenever a large weight penalty is "not" incurred that it is a good idea to design structures with such low stresses that they rarely incur any cumulative fatigue. Hence those parts of structures have such extended projected lifespans ( say 25,000 hours) that it is simply never a worry. I am not familiar with the Sonex but I am guessing that the designer overbuilt to a degree the most critical areas subject to stress and fatigue so that fatigue should never be a worry in any flyers/owners lifetime..
  3. Kasper- I wont argue with you because I agree with most of your points. Of course the market has changed a lot in the last 40 years. There are many more options and alternatives to choose from compared to 1978 regarding fun hobby activities. I am just recalling a time when the Sky-Rider was a step up from the Wheeler Scout initially even with the 12 hp McCulloh engine. For me, the kind of guy that would not demand a lot more performance than 15 or 18 hp would provide with the Sky-Rider design on a calm cool day at low altitudes, I am merely pointing out that an increase in reliability thanks to 4 stroke technology would be appreciated. No I never said you would become wealthy building and selling this type of plane today... Drones and Cell Phones and Electronic games are what have captured the interest today but a few old timers like me might like to do the old "Low and Slow" dance in a low cost easy to build airplane. Funny thing about us old timers.... we for some reason are more concerned about safety than we were 40 years ago and to me that means 4 stroke. Sure there were planes to come that flew with 40 and 50 hp and that is because they needed the power but in very few cases were they "Legal" at least in the USA and I believe Australian rules were not much different. I dont know when and how the Australian rules changed but the USA rules for ultralights have NOT changed at all except that they outlawed all former UL training vehicles. It was totally the pilots fault because 90 percent of all planes sold were trainers and 90 percent of all flights with a passenger was a training flight with an untrained instructor. It didnt take too many crashes till the FAA said "NO MORE" taking advantage of their generosity in allowing training. Let me ask you Kasper, how do you think the Wheeler Scout would perform with a Rotax 28hp 277? What is the legal maximum empty or max take off weight of an ultralight plane in Australia that does not require a pilot or airplane to be licensed in any way ? In the USA the max empty weight is 254 pounds. While there may not be a large business opportunity to produce kits in Australia, it might be desirable for the occasional old timer to be able to build an old design from plans and still be able to incorporate any modern enhancements that might be available as improvement. The alternative is a complete factory LSA type plane I think that begins well over one hundred thousand dollars US or Aus.... Kasper, you are correct about the recent retired being exposed to 100,000 dollar planes in training but when they see the pricetags they might somehow find their way to this forum for relief and find out about the Sky-Rider and other affordable choices. Is'nt that really why the forum exists ? Scott PS. I was surprised to hear that Eipper sold a lot of MX planes in Australia.
  4. It seems like there would be many alternatives for engines and props at way less than $7k. The plans built SkyRider would ride like a rocket with a good 20hp engine. In particular I would love to try this racing go kart on that exact plane Ersatzteilshop Fresh-Breeze - Swissauto 250 The claim by the Kart racers is 30hp at 11,000 rpm but I would be happy to derate it to 20hp at 7500 (guessing) for reliability. Another 4stroke engine I would like to try is the Honda GX390 which would be heavier but on an old plane with huge wings I think the power and weight would be perfect. Ersatzteilshop Fresh-Breeze - Swissauto 250
  5. Well this info is a total shock and a surprise. A Pod and different wings turns this into a completely new airplane I think. Was the new design Gary's doing or did a customer just decide to modify his plane and borrow some ideas from the many other designs at the time? I believe Gary hung his original plane in a museum and I figured he was totally out of the business. When you said "factory" built..... can you tell me if someone was serial manufacturing this "new improved" version of the plane. My hot focus point was the flaps. Did the new version wings have separate flaps ?
  6. Anyone ever know or hear about the Kimberly Skyrider ? It was a favorite of mine as it was the only ultralight type aircraft that had separately controllable huge flaps. I believe the designer was a pilot for Quantas and he sold plans but I never heard of or saw another one built besides his.
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