Pond Skipper

Today I field tested the APC 4.2x4 do to size of plane if hasnt been an option really
however I was curious how much rpm I could get with the pipe.

20% nitro and oil / 58 degs outside partly sunny.

Best read - APC 4.2x4

- 25,597 static / .15 hp / 9.2 oz thrust flew out of the hand ok due to wing span.
- 29,877 level pass from a dive / 113 mph
- 28,983 no dive level /110 mph
- 27,967 slowest pass into wind 106 mph / wind 7 to 9 gusts to 14 per weather.

An all balsa Quickie 100 should allow the prop to make into 31k range.

Small prop was slipping no sustained vertical great for in your face flying
fuel flow was good after first flights adjusting a bit more rich. Actual speed
was down in the low 90's but good for lots of acro box flying climb would
die off early from a dive perhaps 140ft. I made two landings with the engine
still running, grass is low this time of year.




One of the landings use link for full screen:
https://www.youtube.com/watch?v=eIvH4Qtz9WY

https://www.youtube.com/watch?v=eIvH4Qtz9WY All data to date:

APC
4.2x4...............25.60k static / 29.88k - 113 mph
5x3..................25.47k static / 28.47k - 081
4.5x4...............23.98k static / 27.63k - 105
4.75x4.75EC.. 22.86k static / 26.64k - 120 - best visible performance
4.75x4.............23.58k static / 26.48k - 100
5x5E...............20.43k static / 24.94k - 118
4.75x5.5E.......21.56k static / 23.60k - 123



https://www.youtube.com/watch?v=GjpUpDBluRk
Published on Jan 17, 2016
Recorded at 60 fps wide screen / 1080P reduced to 240P by YouTube
Shown in lower resolution for lag free viewing of the planes speed on all devices.