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Old Dec 08, 2012, 06:50 PM
Aka: Tom Jenkins
ApexAero's Avatar
Palm Beach County, Fl.
Joined Aug 2008
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Contest
'70mm class EDF Speed Cup Challenge'

'70mm class EDF Speed Cup Challenge'
A speed competition with no airframe restrictions


Rule #1: Anything goes in an attempt to make your EDF Jet go 200 mph.
Modified stock airframe or one design scratch built airframe, refer to rule #1
Landing gear or belly slider, refer to rule #1
If you guys want to ad twins possibly as another class to the 70mm then lets do it


Prefer the airframe be carefully built as best possible by the builder to withstand the forces and pressure at triple digit speeds, motor torque and battery weight.
Multiple attempts allowed as well as multiple airframes.


Speed video should be clean and free of talk and IC noise as possible.
.wav sound file would be extracted of best passes left and right for averaging speed. Temperature is needed for the flight day.

Speed to be determined by a Wavoscope Doppler type program. By myself and or seconded by others for consensual assessment and agreement of speed. (to those concerned as to any qualifications to Doppler a video by me, not to worry, I have the time and a firm unbiased opinion of performing the duties with diligence and have been an AMA member for a very long time)



Leader board as of 2-26-2014
1st NEW RECORD!!! avg is 189.6mph for the Ergo jet of ApexAero 3-1-14
2nd Place is Team HabuBurners with avg speed of 186mph
3rd Place fh64_Lucky with avg speed of 185mph
4th
5th
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Last edited by ApexAero; Mar 03, 2014 at 05:42 AM. Reason: Thanks to JC and Gary's gentle nudge
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Old Dec 08, 2012, 07:14 PM
3DHOG
jcdfrd's Avatar
USA, CA, Aromas
Joined Sep 2010
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I would think anything in the 200-299mph would qualify in the 200mph Cup Challenge....right......its when you go over 300mph that you are disqualified
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Old Dec 08, 2012, 07:16 PM
Lee Liddle
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Carrollton, Tx
Joined Dec 2006
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BuuuYaaa, baby! I`m ready to cut some balsa.
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Old Dec 08, 2012, 07:17 PM
Lee Liddle
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Carrollton, Tx
Joined Dec 2006
8,223 Posts
Quote:
Originally Posted by jcdfrd View Post
I would think anything in the 200-299mph would qualify in the 200mph Cup Challenge....right......its when you go over 300mph that you are disqualified
Good point, I`ll look into an rpm limiter so that I don`t break out.
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Old Dec 08, 2012, 07:20 PM
Aka: Tom Jenkins
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Palm Beach County, Fl.
Joined Aug 2008
4,490 Posts
I just finagled a 160hv today for a secrete project
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Old Dec 08, 2012, 07:22 PM
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United States, TX, Lubbock
Joined Oct 2007
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Yep all those 300mph 70mm jets need to go somewhere else. Don't even bother here! We're a classy bunch with no tolerance for crazies.

This is exciting! What a way for me to break into EDF's

I'm all in.

Thanks for heading this up, ApexAero!
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Old Dec 08, 2012, 07:25 PM
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United States, TX, Lubbock
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Quote:
Originally Posted by ApexAero View Post
I just finagled a 160hv today for a secrete project
I just did something to my 160HV today that started with an F. But it wasn't finagled.

Digging it out of the Spear now to see if I can figure out what caused it, but hopes aren't high.
It wasn't running even close to out of spec (122A) so I'm thinking my as-yet untarnished soldering has been the culprit, as I resoldered new motor leads to the board. We shall see...

Edit: Well, it's a little bigger mystery than that. This wasn't the one I resoldered.
But there is nasty gunk spattered all on the inside of the ESC, so something went wrong... will let Castle figure it out.
But at least my soldering reputation stays intact!
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Old Dec 08, 2012, 08:53 PM
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Atlanta, GA
Joined Mar 2009
891 Posts
I suggest someone mounting a high efflux speed fan in a pod on top of an electric pylon racer like the Viper, Jibe, or Swist. Those airframes are incredibly efficient.
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Old Dec 08, 2012, 11:29 PM
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United States, CA, Santa Clarita
Joined Aug 2009
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[QUOTE=ApexAero;23477686Speed video should be clean and free of talk and IC noise as possible.
.wav sound file would be extracted of best passes left and right for averaging speed. [I]Temperature is needed for the flight day.[/I] [/QUOTE/]


The ambient temperature..... at the time of flight..... at the flight location needs to be recorded. Not high temp for the day


Higher temps increase the doppler analysis speed result.
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Old Dec 08, 2012, 11:33 PM
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dallas tx
Joined Jun 2003
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Good, he didnt say anything about rocket assited 70mm .
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Last edited by capt soap; Dec 09, 2012 at 12:56 PM.
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Old Dec 09, 2012, 12:46 AM
Aka: Tom Jenkins
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Palm Beach County, Fl.
Joined Aug 2008
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Capt, the sparks denote its location like a marker flare upon crashing!
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Old Dec 09, 2012, 12:59 AM
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St.Catharines, Ontario
Joined Jan 2009
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so, should we have a thermometer present for our speed runs, that is clearly a part of the video and should be clearly seen on the shot just before the flight? is that fair? sounds like it to me, so that someone can't gain an advantage by giving an incorrect temp.
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Old Dec 09, 2012, 01:07 AM
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Quote:
Originally Posted by LuvEvolution7 View Post
so, should we have a thermometer present for our speed runs, that is clearly a part of the video and should be clearly seen on the shot just before the flight? is that fair? sounds like it to me, so that someone can't gain an advantage by giving an incorrect temp.
What if your field is in the sun?
Have to go with a weather report from a reputable source then.
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Old Dec 09, 2012, 01:38 AM
Aka: Tom Jenkins
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Palm Beach County, Fl.
Joined Aug 2008
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I have a weather app keyed to my local area on the phone, the temp is usually from the airport. The phone's gps doesn't have the temp data. Before I got the phone there were friends that always had one.
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Old Dec 09, 2012, 02:28 AM
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St.Catharines, Ontario
Joined Jan 2009
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my point is that I could say anything I like, knowing it'll change the outcome of the test. so shouldn't we somehow have to provide an accurate way of showing the temp at the time of the flight. just figured having a thermometer might be easier for some folks. if the sun is out, then obviously it's gonna affect the reading, but if you take it in the shade, it's gonna be a bit more accurate than in direct sunlight. I'm not suggesting that it's the best solution, just suggesting that there be a solution that is best for everyone that is also accurate for testing purposes.
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