• Welcome aboard HomebuiltAirplanes.com, your destination for connecting with a thriving community of more than 10,000 active members, all passionate about home-built aviation. Dive into our comprehensive repository of knowledge, exchange technical insights, arrange get-togethers, and trade aircrafts/parts with like-minded enthusiasts. Unearth a wide-ranging collection of general and kit plane aviation subjects, enriched with engaging imagery, in-depth technical manuals, and rare archives.

    For a nominal fee of $99.99/year or $12.99/month, you can immerse yourself in this dynamic community and unparalleled treasure-trove of aviation knowledge.

    Embark on your journey now!

    Click Here to Become a Premium Member and Experience Homebuilt Airplanes to the Fullest!

Search results

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
  1. N

    UL 103 engine?

    The problem is the synchronisation by chain ,electromotors or angled gears etc. Testing of that does not need extra pistons ,castings etc. Make and instrument a testrig with two identical props but handed and a crossed chain. If put up in front of a car and driven fast, wind-milling it will show...
  2. N

    Current redrive options for Predator 670 project?

    On the Ace site it mentions that belt tension should not exced 29N(ewton)m(eter)? Strange units around
  3. N

    A narrow, six cylinder that can drive from both ends?

    It will be lovely and helpfull if you give us a sketch of idea. If the two propellers work on same axis with say length of an inline 6 between it is a blind alley.
  4. N

    Three cylinder VW

    Then it cannot work.
  5. N

    Three cylinder VW

    Counteract the first order of reaction torque variation from a two cylinder boxer with a single unbalance shaft and it will be felt by aircraft and occupant as a being behind a fourcylinder. I have tried to explain it another place for a two cylinder two stroke boxer that is just as uncivilized...
  6. N

    Three cylinder VW

    Why?
  7. N

    Three cylinder VW

    This sounds interesting. A two cylinder fourstroke boxer with two co-roating un-balance shafts can be running as smoth as a fourcylinder doing same work How many TakeOff horsepower at how many rpm and max width over cylinderheads? Four stroke power is proportional to mean effective pressure...
  8. N

    Harbor Freight Predator 670 V-Twin Horsepower tests

    Would it be an advantage if the clubs were circular section instead of square?
  9. N

    Thinking about developing a new engine for GA, but looking for a bit of feedback before starting.

    A high power battery can store maybe 300Wh/kg. Not 300 kWh/kg Diesel Oil for 340 hours 70MW will be about 4000 ton
  10. N

    Genset

    The video show a two stroke twin driving a 7.2kW generator that keep four small props happy and turning. My ARV super 2 912 Rotax erzats shall have two gensets and a single prop motor. Each genset is a single cylinder with two pistons and cranks and generators a la Junkers. High tension
  11. N

    Genset

    Reverse Quad
  12. N

    Genset

    OP said existing or possible
  13. N

    Genset

    Is 40 degree celcius common in affluent countries apart from USA? Postulating eternal global limitations for a new technology based on product from a single european manufacturer is risky
  14. N

    Genset

    To use real numbers and earn money let us better the one and only Rotax 912 that has TO-power 60 kW at 40 rps. This is 240 Nm peak torque Emrax (Pipistrelle I think) 228 electric motor TO torque 230Nm,survive 75kW conversion losses and is 13.5 kg or 180 gram per kW. I am sure they can design...
  15. N

    Genset

    This one says less than a kg per kW. 7,2 kW Direct drive electric prop motors are around 150 gram per kW Serious devellopment and competition in this field is not more than 5 years old so is not levelled out yet. Specific mass per power usually go down with bigger size.
  16. N

    Thinking about developing a new engine for GA, but looking for a bit of feedback before starting.

    An inverted,direct drive,liquid-cooled ,four-strokeV8 can have sensible bore/stroke ratio and be narrower than an opposed cylinder 6 or 4. And smoother running as well. Lets fix some numbers: Max width of engine TO horsepower/rev per second TO mean piston speed
  17. N

    Thinking about developing a new engine for GA, but looking for a bit of feedback before starting.

    Napier Nomads with electricity between turbo and crank will be lower mass Napier Nomad
  18. N

    Thinking about developing a new engine for GA, but looking for a bit of feedback before starting.

    I discussed Zoche diesels with mr Wilksch many years ago and he meant that Zoche problems were piston related. That rhymes with mr Ricardo that told us that diesels put two times as much heat in pistons compared to sparkies at same power level. It is tempting to copy the Zoche layout with...
  19. N

    UL 103 engine?

    High friction and lousy balance
  20. N

    Possibly lightweight, direct-drive - high-power four-stroke?

    I rode a turkish built 300ccm MZ clone motorbike for around 1000 hours and it was still easy to start when it was sold due to my age. Max power 21 horsepower and my style ca 15 horsepower.
Back
Top