Recent content by MadProfessor8138

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  1. MadProfessor8138

    Rotax 670/gearbox/prop..magic # ?

    I had the same idea a few years ago when I was shopping for a prop to put on a friends plane.....called a couple of prop manufactures to see what kind of numbers that they were seeing with their props and asked what they recommended for his aircraft and particular set up. The short answer is...
  2. MadProfessor8138

    Rotax 670/gearbox/prop..magic # ?

    That's part of what I'm talking about... Different pitch numbers and the static thrust & cruise stays the same with the hp required going up or down. Doesn't make sense to me..... Kevin
  3. MadProfessor8138

    Rotax 670/gearbox/prop..magic # ?

    Actually,I can.......very easily. Google Ivoprop and see the individual blades that bolt to the hub. Takes about 20 minutes to change out 3 blades. Yes sir......I'm doing exactly that. There's a few #'s that have come up that make no sense to me.....hoping someone can help clarify things. Kevin
  4. MadProfessor8138

    Rotax 670/gearbox/prop..magic # ?

    I've never messed around with a prop calculator before so I don't know that I don't know....... I need to pick a gearbox ratio and prop fairly soon so I've been running numbers like crazy trying to find a combination that suits me. What do you see wrong with the #'s ? Kevin
  5. MadProfessor8138

    Rotax 670/gearbox/prop..magic # ?

    Yes,I realise this...... That's why I'm trying to find a happy median with the whole combination of engine,gearbox and prop.....and that's also why I'm going with an adjustable pitch prop. The problem is that I'm probably going to wind up with 2 different diameter props to acheive good STOL &...
  6. MadProfessor8138

    Rotax 670/gearbox/prop..magic # ?

    You are correct...... But here's why I'm using 6,500 as my base rpm. I talked with Rick about the engine he is going to build for me and I was completely honest with him. I explained to him what I would be doing with the engine and that I wanted an honest 100 hp from it. He said he would advance...
  7. MadProfessor8138

    Rotax 670/gearbox/prop..magic # ?

    The calculations are done with a 3 blade prop...... And it's not as simple as just adjusting pitch........gearbox ratio,engine hp,prop diameter and temp. all come into play. Kevin
  8. MadProfessor8138

    Rotax 670/gearbox/prop..magic # ?

    There lies the rub.......the static is what I'm after.....but only sometimes. And you're only talking 10 - 15 feet before breaking ground and pulling throttle back. I want to be able to pull up to the line at a STOL competition and show them that a $15k plane can compete with their $250k plane...
  9. MadProfessor8138

    Rotax 670/gearbox/prop..magic # ?

    I'm hoping someone smarter than myself can help me find the magic # for engine,gearbox and prop combination. The goal is to acheive maximum static thrust while still being able to maintain a decent cruise speed. Once my Ragwing Stork is completed it will be my leisurely daily flyer but I would...
  10. MadProfessor8138

    First Ultralight Flight This Weekend

    He actually forgave me for that incident..... Much time had passed and we were all setting around the fire pit one night talking about things when the subject of that day came up. He admitted that he came very close to hurting or killing both of us during that first flight and knowing what he...
  11. MadProfessor8138

    First Ultralight Flight This Weekend

    There's actually a second part to the story that I'll share.... About a year goes by after the incident that I wrote about and the same guy shows up at the field again wanting to fly ultralights. Myself and the guys sort of just ignore him and do our thing for the weekend. The next weekend he...
  12. MadProfessor8138

    First Ultralight Flight This Weekend

    The worst ultralight pilots are GA pilots.....they do it all wrong until they learn better. Many years ago at a grass strip far far away.......a GA pilot showed up trailering a Quicksilver MX that he had just bought and wanted to take a ride in one before flying his. He was told that he needed...
  13. MadProfessor8138

    Converting Sail Cloth a/c to standard fabric covering?

    My advice is to stay with the original design by using sails....the aircraft is designed for them. You will gain nothing by trying to change covering methods other than sleepless nights,an empty bank account and a plane that is not airworthy. Bite the bullet and call Sandy or Brett and spend the...
  14. MadProfessor8138

    Wanted Loehle 5151...

    Does anyone know of a Loehle 5151 for sale....flying,under construction or kit ? Kevin
  15. MadProfessor8138

    Aerial Spraying: What AGL?

    No...I understood what you were describing just fine...no need to shout. 😁 While application methods will vary....spraying is spraying for the most part. I understand that you were talking about a wide spread application but you have to consider the fact that they aren't spraying Agent Orange...
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