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  1. BBerson

    carb adjustments for Mosler CB-40 on a Mini Max

    Was there a big static rpm change after the valve seat work? I would adjust the mixture with new plugs and check the color after 5 minute runs.
  2. BBerson

    carb adjustments for Mosler CB-40 on a Mini Max

    The 2800 sounds about normal to me for static. What is the book number for static rpm? Dana said the 3200 is at 60 mph. The throttle position is not abnormal either for static, I think.
  3. BBerson

    Where to look for source of temporary electrical system failure?

    I don't see any circuit breakers that reset after cooling down and toggling the master switch. But I do see some "not FAA approved" electronic circuit breakers in the Aircraft Spruce (2016) catalog. They shut down with over or under voltage and reset by toggling the master. Might be what...
  4. BBerson

    10/23 Raptor Video

    That is a bit too simple. In his test he has the fan blowing the flat backside of the prop. In flight the wind hits the curved frontside. I did it with my fan and my prop, big difference. It barely rotates in the correct orientation and doesn't hurt when sticking my finger in it.
  5. BBerson

    10/23 Raptor Video

    I think he said " west coast". Could be Oregon or Washington.
  6. BBerson

    Drivetrain Power Loss

    For an airplane prop shaft the losses could be as small as the bearings, I think. Three bearings shown here, but only one additional bearing is needed for direct drive.
  7. BBerson

    10/23 Raptor Video

    Certified airplanes sometimes have rpm avoid zones. Marc's prop came off with some airframe damage but the landing was a success.
  8. BBerson

    Wing Load Test Failure Aluminum Dragon

    Yep. My spar failed first test also. That compression cap is a bugger.
  9. BBerson

    A solution looking for a problem

    The Questair skins were stretch formed with hydraulic cylinders, as I recall, from the Sport Aviation article.
  10. BBerson

    Prop shaft

    One guy on the yahoo small engine forum flew his vertical shaft Briggs with the 90° belt drive on his powered parachute. I would think three feet of straight belt should twist ok. I wouldn't call it a twin engine airplane because if one engine seized it would stop the other engine same as any...
  11. BBerson

    10/23 Raptor Video

    Cirrus floundered at the beginning with a pusher. Pusher has never seen a mass certified market, as far as I know. Cirrus abandoned the pusher.
  12. BBerson

    Prop shaft

    Long V belts can be a shaft alternative. The engine would be vertical shaft like a Briggs 810 or two- stroke mounted vertical. The belt is turned 90° around rollers to the horizontal prop shaft pulley sheave. Two Briggs 810 could power one prop for about 60hp.
  13. BBerson

    spec list of efficient light planes

    Do you remember the prop rpm direct drive in static, climb or cruise? I see it is rated at 6300 rpm, but doubt that is used direct drive.
  14. BBerson

    10/23 Raptor Video

    "At this point a simple mechanic is smarter at implementing something than a claimed engineer." He doesn't claim to be an engineer or mechanic.
  15. BBerson

    A solution looking for a problem

    Water pressure is relatively safe.
  16. BBerson

    10/23 Raptor Video

    It was working as required. Or better than the original steel collar. Someone mentioned the bearings might overheat if they have seals on both sides. I don't know if they do or not or if that is an error for him to correct.
  17. BBerson

    Where to look for source of temporary electrical system failure?

    Maybe the OP has some sort of automotive master switch with automatic reset?
  18. BBerson

    Lift Strut and Cabane Strut loads

    If the wing is sand bag tested inverted with a 14° nose down fixture, that similates the high angle g load and applies a forward force to the wing while loaded. See Basic Glider Criteria:
  19. BBerson

    Where to look for source of temporary electrical system failure?

    The master solenoid on the Cherokee (as shown above) has a special dual switch for the alternator field. Normally both switches are flipped on as one switch
  20. BBerson

    Where to look for source of temporary electrical system failure?

    Yes, the starter is direct. What about circuit protection of the main bus?
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