Recent content by dcarr

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  1. dcarr

    Polymer Bearings

    Van's Aircraft uses polymer (UHMW?) bearings in several places. Some I can think of off the top of my head are the rudder pedal bearings and the flap torque tube bearings. In both of those cases, the bearings are ~0.75" wide and ride on the OD of ~1" 4130 tubes. Here's an example: :
  2. dcarr

    Air conditioning electrical power question

    If it were up to me I'd start by giving the ice cooler a shot first. You can build one in a weekend and get a concept of what "that many" BTUs feels like. Very approximately, one pound of ice melted = 160 BTUs. So 20lbs ice in 30 min = 6400 BTU/hr for example. Based on my experience that's...
  3. dcarr

    10/23 Raptor Video

    I attached Ross's file above to this post...
  4. dcarr

    120 gallons of fuel, 1,400 lbs useful load? (680+ payload?)

    Piper Malibu? I think it ticks all the boxes except that it comes pre-assembled.
  5. dcarr

    10/23 Raptor Video

    Something interesting happens when you start looking at pressurized GA aircraft. Arguably certified pressurized aircraft are actually less expensive than experimental ones (especially if comparing like for like). Look at the Piper Malibu/Mirage, Cessna 340, Cessna P210, Cessna 421B--nice...
  6. dcarr

    VH-SRS 170 knot Sonerai II

    Agreed the trailer looks great!
  7. dcarr

    Presurization - Whats it take ?

    I think Heliano is onto something...
  8. dcarr

    Raptor Composite Aircraft

    We all know Peter has a lot of problems to overcome if he wants to succeed with the Raptor project, but... Building and flying any airplane is a incredibly difficult and rarified accomplishment (even if it doesn't fly very well). Let's take this one moment to tip our hat to Peter for doing it...
  9. dcarr

    Electric fuel pump

    FireMedic, I feel your pain on the boost pumps. I looked at a lot of options and finally came to the conclusion that it would be hard to beat the AFP pump from a cost/size/reliability perspective.
  10. dcarr

    Why not a Continental IO-360?

    Vans offered the IO-360 as an option for the RV-10 for a while. Customer interest was low vs. the IO-540, but the factory reports that it was a good engine. A positive recommendation from Vans would carry a lot of weight in my book.
  11. dcarr

    Interesting composites problem

    Lots of really great ideas here. Definitely hadn't considered just adding weight/damping material or the columns/"pillars" approach. The "ship in the bottle" analogy is spot on, but if those modelers do it, maybe I can too! Hope to not have to do the cut it off method, however the message is...
  12. dcarr

    Interesting composites problem

    Here is an interesting composites problem for the brain trust... I have a rectangular "shop made" large overhead console/air duct about 10-12" wide and ~3" deep running down the length of the ceiling of my plane (~6' long). The duct walls are 2-3 plies of 8oz E-glass with spanwise balsa/glass...
  13. dcarr

    Noise Reduction Insulation Techniques?!?!?

    These Sensorcon CO detectors are the real deal and not that expensive. Way better than a "house" CO detector: IMO no excuse to not have one if you're using exhaust heat. They might even help you catch an...
  14. dcarr

    Raptor Composite Aircraft

    It's hard to tell exactly how the new shuttle setup works in the video, but I think there are essentially three chambers inside the shuttle. The center chamber contains high pressure oil from the governor and that oil enters the prop shaft through radial holes in the shaft. I believe this...
  15. dcarr

    New two seater jet aircraft from Sonex

    This thing looks awesome. I always thought the first one was cool, but if you're going to spend that much on a toy you really need to be able to share the experience. It's more money than can be easily justified, but one day who knows?