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  1. C

    What HP are you most interested in?

    the lowest power engines I've looked at are the vw based motors.
  2. C

    "M-Wing"?

    I stumbled on this picture in a what if modeler forum where the wing was called a cranked wing. On wiki it was called a M-Wing with the statement that the idea has been studied many time but never used on a plane. I can't find any sign on these studies and besides messing with the balance can't...
  3. C

    Aspect ratio and weight

    I agree Mooney is a good aircraft to use as a benchmark for performance at fuel economy. As old as the design is I have to think we can do better and would love to see performance numbers on the new Mooney I read about a couple of weeks ago. As for A&P issues I have my A and should have my P by...
  4. C

    Aspect ratio and weight

    In researching ideas for a fast efficient cross country plane I've started looking at motor gliders. From what i under high aspect ratio wings are good for low drag at low speeds and low aspect ratios are better for high speeds as well as being stiffer and thus being able to be built lighter...
  5. C

    Motorglider definition

    Thanks I was sure I had to be miss understanding something. Makes more sense now. The squared part had me thinking area.
  6. C

    Motorglider definition

    I was looking up motor glider requirements and found a reference to AC 21.17-2a which defines a powerd glider for the purposes of issueing a type certificate as such one or two seats, max 1874 gross, and a wing loading of .62lbs/square foot. And no such restrictions on aircraft certificated as...
  7. C

    DIY gauges??

    look at what some of the rc guys are with andrino stuff you could probably adapt it to make a complete glass cockpit for cheaper than a set of steam gauges.
  8. C

    Temporary affix CF on foam core

    Seal the foam and use a release wax like any other time you would when making a plug.
  9. C

    Rag-and-tube canard?

    That Focke-Wulf F-19 is better looking but still a bit odd. Is that an open cockpit with a closed passenger compartment?
  10. C

    Hot Duct

    So if I'm looking at it right then at the point were airflow separation would cause drag it is pulled into the duct so then you have one point of separation at the duct exit. An interesting solution but what does it do for the volume and speed or the air entering the duct and does that...
  11. C

    Hot Duct

    So on that duct on the back or the egg shaped fuselage are the gaps between the rings in between the duct and fuse the intake for the duct?
  12. C

    Hot Duct

    Ducted Fan Design A ducted fan will our perform an unducted prop of the same size so it's primary advantage is in it's potential compactness. Also depending on specific design and application it can protect fro prop strikes and FOD damage. Designed properly they can improve static thrust. They...
  13. C

    Hot Duct

    It's too early to completely define design goals but right my interests that will probably effect mission when I get that far are in order cross country cruising, amphibious operations, unimproved surface landings, and light aerobatics. keeping operational costs down as far as possible is also...
  14. C

    Hot Duct

    Not sure stationary power units are applicable when talking about thrust augmentation but I'll keep that in mind for engine efficiency tricks. My reasoning for considering the duct is for greater clearance when referring to trying to achieve a "competitive level" of performance I was talking...
  15. C

    Hot Duct

    Can you direct me to any examples? The closest thing I could find was the P51 cooling duct and other similar arrangements. None attempting a cooling fan duct hybrid. Also if you've already decided on liquid cooling and thus need some type of cooling duct anyway where do you get a mass penalty...
  16. C

    Hot Duct

    But if you heat the air after the fan you would increase volume and as such would increase pressure behind the fan. Both fans and props only get a portion of their thrust from mass displacement and the rest comes from creating a pressure differential the same way a wing does. This pressure...
  17. C

    Hot Duct

    A ducted fan fan is a effective thrust device it just has some efficiency loss due to duct drag. A piston engine converts 70% of it's fuel into waste heat instead into mechanical energy. About 50% of this lost energy energy is carried away in the exhaust gasses and can be put to work spinning a...
  18. C

    Hot Duct

    The p51 was where I got the idea and after a bit of reading the consensus appears to be some were between only slightly effective and breaking even with cooling drag so I figure dumping as much waste heat into the fan duct as I can should do something to counter the drag of the duct. As for the...
  19. C

    Hot Duct

    I've been reading on ducted fans and have read about cooling ducts for liquid cooling solutions. It seems that a duct design that slows airflow through the duct is beneficial to both cooling and propulsion ducts. In the fan a duct design that decreases airspeed through the duct will increase...
  20. C

    Rag-and-tube canard?

    Only canard tractor I've seem that I liked the look of was the quickie and it's descendants.
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