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  1. X

    Add lead to mogas..

    You're right, doing a quick calc the TEL cost is around $1/gallon to match 100LL TEL content. Then it's probably not worth it.
  2. X

    Build a simple radar altimeter

    No worries. I thought it was better to let ppl know what my intention are, it wasn't really clear from my previous postings.
  3. X

    Add lead to mogas..

    Hi I know that the 100LL quality itself is much stricter than mogas, but is it possible to use mogas premium 93 AKI octan (98 octane in Europe and elsewhere) and add TEL (lead), using for instance Kemco Oil & Chemical Inc, to improve AKI (raise octane level) and get and get the lower-wear...
  4. X

    Build a simple radar altimeter

    By the way, the price for the "low cost" Roke MRA Roke | Miniature Radar Altimeters is £10,551.00 (about $17,200.00). I guess when they stated "Low Cost", it was the cost for them to manufacture it in China, not the cost (price) for the customer to purchase it :)
  5. X

    Build a simple radar altimeter

    It's for future use on glassy water landings (my plane is not on floats yet). I'm currently very inexperienced (no float rating yet) and even though there seems to be a very good technique of landing in glassy, I wanted to use this as a aid to get myself confident. I haven't done much research...
  6. X

    Build a simple radar altimeter

    OK, I've officially given up the idea of making that radar altimeter. It seems like ultrasonic or laser is a better and simpler solution. Unless Roke | Miniature Radar Altimeters will quote me a good price for their radar altimeter. I would have liked to get some experience in making...
  7. X

    Build a simple radar altimeter

    I've actually been in contact with the webpage owner, and asked for a part list, but he didn't have one. My idea was to get some experience as well use it later on, but I don't want it to be a year long project, rather a few months at max. Maybe you're right, it's too big project. Anyone...
  8. X

    Build a simple radar altimeter

    The intention is to use as a secondary help for float plane (experimental) landing on glassy water. But maybe a laser range finder or a ultrasonic sensor makes more sense. Are there any laser range finders or ultrasonic sensors for aircraft applications, or that can be adopted to put on an aircraft?
  9. X

    Build a simple radar altimeter

    jhausch: Thanks, I'll check out that forum! Dana: I'm in Westbrook, you?
  10. X

    Build a simple radar altimeter

    Have anyone tried to build this radar altimeter: S53MV ARM DSP Vertical Navigation Radar Or anyone that have experience in building electronics that can direct me to either where I should buy the components or a good forum for building electronics? Thanks, Chris
  11. X

    Stability impact of a longer nose

    Thank you so much guys! I see now that I have to use the geometry to find the stability, I was hoping to avoid that by only obtaining the Δ(stability) ); But that's fine, it just takes some more effort to do it. If I ever decide to actually do move the prop forward I'll need to go into this in...
  12. X

    Stability impact of a longer nose

    Thank you LBarron and Billski! I looked at Roncz spreadsheet, that was interesting. I guess the pitch moment is linear proportional to distance, which is actually pretty obvious. So 10% (rounded from 11.11%) increase in nose length will increase moment from propeller with 10%. I assume that the...
  13. X

    Stability impact of a longer nose

    Hi I'm trying to find an easy way to evaluate how much a 10" longer nose (i.e. 10" fwd move of propeller, from about 90" to 100" from CG) will impact longitudinal and directional stability of the airplane. Anyone knows? I'm only interested in percentage change in stability, and not so much...
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