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Mpx Funjet ultra at 218 mph

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Mpx Funjet ultra at 218 mph

Old 06-30-2023, 12:18 PM
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Rudeboy
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Default Mpx Funjet ultra at 218 mph

I decided to attend a speed meet in Germany a few weeks ago.
They had a side event with foam models.
My Multiplex Funjet Ultra was clocked through the camera speed trap they use for all of those speed events, at 351 kmh...that's 218 mph.

This was on a totally stock airframe, aside from some good servos.

Pretty stoked about that, I might add 😜

218 mph
Old 07-01-2023, 07:20 AM
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WOW, always looking to get past the physics of 1" per 1 revolution so I can go work for DARPA,,, to bad we don't have any motor, prop, battery data.
Inquiring minds want to know....

Old 07-02-2023, 03:21 AM
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Originally Posted by c/f
WOW, always looking to get past the physics of 1" per 1 revolution so I can go work for DARPA,,, to bad we don't have any motor, prop, battery data.
Inquiring minds want to know....
Motor: TP POWER 3635 (1870kv)
ESC: Sunrise ICE 150
6S3000 battery (SLS lipo 30C)
Prop: 7,6" pitch F3D racing prop
Old 02-25-2024, 10:21 AM
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Hello! This motor is rated for 86 amps and 2200 watts. May I ask what was the measurement for this combo (7x6 prop)?
Was it really for just one fast pass or it's capable for more? Thanks!!!
Old 02-25-2024, 06:55 PM
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Hmm,
Now I do lot of speed stuff but:
I've never got 120A / 3HP + out of a 500gram battery, that would be some insane burst mode specs.
A 6" pitch prop, face value zero drag which I'm OK with needs to be 38.5K rpms range to hit the 218 MPH pitch speed ie one revolution of 1" pitch moves forward 1"

Then Ecalc verification seems a bit off, but I believe what you say I would love to cut my flying weights down by 30% for a 40% speed increase has been my hurdle.

I am impressed with you mix of equipment find. Gonna look into these TP motors



Old 02-27-2024, 06:35 AM
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It wasn't a 7x6 prop.
It was a 6.6x7.6 carbon prop.

With an APC 7X8 prop we were pulling 192A static on a fresh pre-heated battery.

With the carbon racing prop, which is a 7,6 inch pitch prop (trimmed to 168mm diameter) we were pulling 184A static.

This is burst mode only: 4 passes through the speed trap and I was recharging 1500mAh into a 3000mAh pack.

Last edited by Rudeboy; 02-27-2024 at 06:55 AM.
Old 02-27-2024, 08:00 AM
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We never tested an APC 7X6.
I would guesstimate amp draw would drop to a more or less "reasonable" 155A, somewhere in that range.

And I wouldn't want to stand near it when you open that thing up...it will spin that prop at over 30k.
Remember it's only a piece of fibre reinforced nylon 😳
Old 03-03-2024, 06:30 PM
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Appreciate the update, I like to play around with the numbers with some real world data others share.......

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