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Fastest Electric ARF

Our fun RC record attempts.

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liaan
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Fastest Electric ARF

Unread post by liaan »

Challenge: Fastest ARF electric

Rules:
Must be ARF/Kit, must be electric. 2 Runs must be recorded via GPS. Radar, dopler or simular. The 2 runs must be within 20km/h, the fastest counts.

General Discussion thread relating to this particular attempt (if applicable): none yet

Attempt posts to include as minimum for consideration (cut and paste below into your submission):

Date: Aug 2010
Time: ~10am
Speed: 242km/h
Aircraft type: Great Planes Revolver.
Powerplant: Suppo 4120
ESC: Suppo 80A HV
Battery: Revo 9s1p 3300mah
Prop: EMP 11x12 (modified 12x12)
Location: TMFC (Cape Town)
Recording: GPS, Graph attached

Notes (add any pertinent info in respect of your attempt): about 10km/h wind
Revolver Maiden, 11x12, 4130, 9s1p 3300.jpg
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bla bla fishpaste

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wingdragon
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Re: Fastest Electric ARF

Unread post by wingdragon »

Hi, seems a bit dubious, from 110km/h to 242.99km/h in 0 secs? :?
liaan
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Re: Fastest Electric ARF

Unread post by liaan »

Welkom to GPS speeds.... it only polls every so often, and you pickup qoute a lot of speed from going vertical down to horizontal all sudden.
remember vertical down - 0 ground speed, then pull 90 degree and all the vertical speed (0km/h ground) converts to ground speed.. so you can actually "accelarate" quite fast

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wingdragon
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Re: Fastest Electric ARF

Unread post by wingdragon »

Ok, cool! understood. 8)
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Marnu Bothma
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Re: Fastest Electric ARF

Unread post by Marnu Bothma »

Mini Sundowner
motor ?
Esc?
Batery; 5500mAh 90c nano tech
Speed; 388kph
liaan
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Re: Fastest Electric ARF

Unread post by liaan »

Hi Flying Mad

How was this recorded, and what motor /prop did you use?

I stopped flying ages ago, so don't really care if record has been smashed, just like to keep it real ;-)

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Marnu Bothma
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Re: Fastest Electric ARF

Unread post by Marnu Bothma »

used a cell phone twice and a gps system both were the same each test. dont know the specs of the motor as its not my plane.
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Buks Coetzee
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Re: Fastest Electric ARF

Unread post by Buks Coetzee »

What is the best and cheapest way of measuring the speed ?
I have a Funjet Ultra and would love to know at what speed it runs How do you measure it with a cellphone ? We estimate it runs at about 250km/h Do i need to get a "spietkop" to come and help ?
I dont like them that much ......
Keep calm and rotate !
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Re: Fastest Electric ARF

Unread post by liaan »

Buks Coetzee wrote:What is the best and cheapest way of measuring the speed ?
I have a Funjet Ultra and would love to know at what speed it runs How do you measure it with a cellphone ? We estimate it runs at about 250km/h Do i need to get a "spietkop" to come and help ?
I dont like them that much ......
Google Doppler affect or measure speed using doppler..

You simply record few passes close to microphone and record the noise .. (cellphone does work) Then you can download the program and analyze the speed using the noise

Howto Vid: http://www.youtube.com/watch?v=K7bCuiDN5Xs

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Buks Coetzee
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Re: Fastest Electric ARF

Unread post by Buks Coetzee »

Cool
Will give it a try
Thanx
Keep calm and rotate !
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Buks Coetzee
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Re: Fastest Electric ARF

Unread post by Buks Coetzee »

Had a look at the video link Awesome .........
Keep calm and rotate !
garymac
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Re: Fastest Electric ARF

Unread post by garymac »

Hi all i decided to modify an f16 60mm fan jet i covered it in solar film and remove the fan and fix an out runner motor with prop on the back of the jet and clock it at 244km.

Date: 17 Aug 2014
Time: 15:00
Speed: 244km
Aircraft type: f16 foam 60mm fan jet
Power plant: scorpion 2221-10
Battery:Gen ace 14.8 2200mah
Prop: apc 5.5x4.5
location: tzaneen
gps : garmin
Wind: no
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Dean
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Re: Fastest Electric ARF

Unread post by Dean »

Buks Coetzee wrote:What is the best and cheapest way of measuring the speed ?
I have a Funjet Ultra and would love to know at what speed it runs How do you measure it with a cellphone ? We estimate it runs at about 250km/h Do i need to get a "spietkop" to come and help ?
I dont like them that much ......
If you have an android phone search for RC Velox in the play store, it's a free download.
I've used it a couple of times, very nice doppler app.
Fly, crash, repair, repeat!
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Dean
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Re: Fastest Electric ARF

Unread post by Dean »

App was removed from the play store. :(
Fly, crash, repair, repeat!
garymac
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Re: Fastest Electric ARF

Unread post by garymac »

I am using an garmin sports watch you can get them at most sports shops but they are not cheap I paid at the time almost 2k

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