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Speed,Combat,Scale,Racing => Speed Talk => Topic started by: Peter Germann on September 21, 2020, 09:22:15 AM
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At the e-speed F2G nationals from September 19th 2020 two swiss flyers passed 300 Km/h (182 mph). For detail go to: www.fesselflug.ch
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Very impressive!
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Sept. 4 2021: Daniel Rota clocks 309.2 km/hr at the Lugo, Italy F2G contest.
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If anyone posted a movie, please post links.
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Given the harsh limitations on 2.5 cc piston engines and the complete lack of limits on electric motors it is not surprising that the unlimited motors beat the limited engines.
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If anyone posted a movie, please post links.
https://www.youtube.com/watch?v=Z09s5Eh6jYc
above ..... New world record - Daniel ROTA - 302.7 km/h @ Breitenbach SUI.
https://www.youtube.com/watch?v=fQwW8cZHivI
https://www.youtube.com/watch?v=XSJyAFHg0jE
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Thanks Peter!
Do you know what folks are using in the power train? Timers, ESCs, motors, batteries?
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Thanks Peter!
Do you know what folks are using in the power train? Timers, ESCs, motors, batteries?
Nope Tim ,
I am pretty sure Peter Germann SUI will know all the facts , he is S.H. Forum member....--- PM , maybe he jumps in.
Regards
Peter
GER-1223
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I will ask 300 Km/h + flyer Daniel Rota permission to publish his e-mail here...
rgds, Peter
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I will ask 300 Km/h + flyer Daniel Rota permission to publish his e-mail here...
rgds, Peter
Here is a bit of basic data:
Motor: 29 mm dia 2600 kV Leomotion L3025 or 3031
Battery: 6S 1700 mAh min. 70C
ESC: Castle Phoenix Lite 50 A Timing Frequency 8Khz
Propeller APC
4.75 x 4.5 230 Km/h
4.75 x 4.75 250 Km/h
5.0 x 5.0 270 Km/h
RPM: approx. 48‘000
For frequently updated information and further data, please check this Group on facebook:
“F2G Speed control line models Electric FAI”
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That is over the edge cool.
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Here is a bit of basic data:
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Thank you Peter. The RPM is interesting -- I'm reminded of talking with a coworker at a previous job, who worked for a firm that made super-high-performance (for the day) brushless motors. It turns out that -- in 1985, at least -- the limit to how fast you could spin a brushless motor was the strength of the rotating assembly. At some point, the motor would throw magnets and seize up (these were inrunners) or otherwise suffer from mechanical failure due to centrifugal effects.
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Makes you wonder how dangerous it would be if the outer casing exploded.
(snip)
I always try to stand away from the plane of the propeller, even with boring old stunt planes. Because something flying off is vanishingly unlikely, but getting your face speared by a prop blade would really, really hurt.
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Makes you wonder how dangerous it would be if the outer casing exploded. How fast is tip speed at 48K on a 5" prop? 714 mph, just below mach 1 for standard day conditions. I think that might exceed APC guide lines lol.
Motorman 8)
As powerplant engineer involved in turbine engine development I am always cautious about being in the plane of rotation of anything that has any kind of rotational speed. It doesn't take but once being around one that lets go. The amount of energy contained in a rotating body can be tremendous.
But ya gotta admit the intrigue of running that motor at 48k is big....
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I always try to stand away from the plane of the propeller, even with boring old stunt planes. Because something flying off is vanishingly unlikely, but getting your face speared by a prop blade would really, really hurt.
Forget your face - that would be the least of your worries. A prop blade, of any material, hitting anything human between knee & the top of the head would likely drop you stone dead - in one side and out the other! Wire cages around speed circles may stop a whole plane but I think i'd like to be behind 1/4" polycarbonate at least when shrapnel is coming my way!
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More Info from Daniel Rota @ page 15 .
Watch above "Video" Daniel Rota breaking the electric CL "F2G SPEED WORLDRECORD" y1 #^ ;D.
https://www.slis.org/_Media/2020_lina_1.pdf
rgds
8) Peter