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  1. skydawg

    cooling fans

    again... I'm not big on thick radiators for reasons above as well air backing up at higher speeds and ducting design takes time and effort to figure out . if it's a 2 or 3 pass radiator typically I see lower efficiency as the air/water temp delta is decreased as it continues thru core, so...
  2. skydawg

    Parts Wanted Narco mounting tray for MK12 NAV/COM

    here's photo of back of radio. the connection to rack is 3 flat tabs. other type uses pins thanks again
  3. skydawg

    cooling fans

    just want to confirm....from water pump, each rad is plummed independently? It's not as much about flow but of coolant/air temperature delta
  4. skydawg

    cooling fans

    finn...ate your radiators plumed together in series?... water flow is flowing from the first radiator directly to the second radiator before returning to the engine?
  5. skydawg

    cooling fans

    I suggest to just use the thermodynamic formulas just to get you into the ballpark, then trial and error to dial in. 1 big radiator is not effective as 2 smaller rads....but it sounds like your radiator is big enough. the challenge now seems to be is to increase air volume through radiator with...
  6. skydawg

    cooling fans

    FINGLYER... That’s some fancy fiberglass work! Before you start modifying it for coolers I’d suggest looking at some other possible solutions first. cooling efficiency is a cumulative factor, and a few small changes can make a significant difference. I’d start with trying to increase pressure...
  7. skydawg

    Parts Wanted Narco mounting tray for MK12 NAV/COM

    yes, thanks. I have 1 with glide slope and 1 without.....they have the flat tab type connectors (not pin type). can send photos if needed
  8. skydawg

    cooling fans

    depends....how wide is the core, single/double/triple pass core, ducting efficiency, ect. u could compare delta by install a cheap anemometer behind radiator and then in front and compare. radiators absorb a lot of energy by time it reaches rear mounted fan. also, modern plastic fan blades are...
  9. skydawg

    cooling fans

    I did want to opine about radiator fan drag as asked earlier.....air velocity does significantly slow through radiator and will windmill as in car when fan is not powered. ...but, mostly insignificant from our c172 speeds at least. we have fan turn on when not needed for engine temp when...
  10. skydawg

    Parts Wanted Narco mounting tray for MK12 NAV/COM

    WTB Narco MK12 mounting tray for unit with glide slope. Need connection with flat connection board, not pins. Anyone?
  11. skydawg

    LS3 conversion for RV10

    Lelievre12….. I was alway intrigued by the Extra400, and wondered why it wasn’t more of a success than it was. Some say due to the engine, some told me higher required and cost of services/repairs. I got a number of Extra 400 owners contacting us about of our V8 engine being a potential...
  12. skydawg

    PSRU choices

    I wrote bout our R&D issues with different PSRUs for our v8 c72 conversion, so won’t bore anyone here with it other than to say that it’s important to test it on your actual airframe -prop- engine combo…..little issues can be significantly amplified. Also, looking at manufacturers claims on HP...
  13. skydawg

    Why is GA continuing its demise?

    that was the point, you caught it.
  14. skydawg

    Why is GA continuing its demise?

    When I started this thread I never thought it would evolve to a Consumers Reports review of washing machine brands, a Norman Rockwell-like rememberence of how things were better when we were young, or theories on macro economics 16-ish pages later….. but, me thinks if the question was more...
  15. skydawg

    Why is GA continuing its demise?

    Thanks all for inputs. It seems most common views/reasons for GA perdictiment is cost to participate, less younger people interested due to sense of old technology and more activates to participate compared to GA's hayday. Few mentioned emissions (noise and tailpipe), but I think legacy...
  16. skydawg

    Why is GA continuing its demise?

    Dana.....I don't wish to digress off topic, but your blanket statement is ignorant and question your experience and understanding of certification matters when posting such definite statements. If you are correct, the project never would have received a faa G1 Issue paper, and all like certified...
  17. skydawg

    Why is GA continuing its demise?

    Wasn't at all point of this thread, just real time example of barriers to small entities trying to enter a dying market. Our original plan was indeed to produce a non-cert/EXP firewall forward package for C172, 182, PA-28 airframes; converting them to EXP Exhibition but FAA has policies (not...
  18. skydawg

    Why is GA continuing its demise?

    The $500 airplane will appeal to an insignificant number of future pilots too low to make any difference in GA's trajectory. Curious how much a project it will be though. Please keep us posted. We had different Econ classes in school. Example, The FBO corporation I rent hanger space from...
  19. skydawg

    Why is GA continuing its demise?

    Me thinks the topic I started has drifted off centerline and would like to get back to topic. I appreciate the many comments and views of what caused GA’s demise. So, now ask WHAT DOES GA NEED TO DO TO RE-IGNITE? I contend first and foremost it has to be far less expensive to participate...
  20. skydawg

    Why is GA continuing its demise?

    Ross…good point, especially with examples of Orenda and EPS which started from scratch, accruing massive expenses which ultimately was their downfall in regardless of market size…. Orenda got the cert for a limited market but development debt caught up. EPS didn’t make it that far and likely...
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