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Old Dec 09, 2012, 03:14 AM
efflux RC's Avatar
United States, CA, Santa Clarita
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Similar info regarding a thermometer at the field.

Habu2 contest:............................(that's one of my slower ones. never entered the 161mph version.)

It was an over cast day......no sun.
Habu - Shubie on 7s (7 min 54 sec)



One comment about the temp from the Habu32 race thread:
On a separate note, I would suggest you add the requirement to show ambient temperature on the video. If Doppler will be used to measure speeds this is an important factor.


another:
Don't forget temperature for the guys doing the Doppler!

another:
I'm working on the wording for the Doppler temp. requirement.

For some reason, they failed to add it to the official rules, but everyone abided by it and posted the temp at the field.







Below are some of the VIDEO parameters for the SAPAC Viperjet speed contest:


"Each Video Submission needs to include all the following elements: "
  • ................
  • An ambient temperature reading using an ambient thermometer (we are looking for air temperature, not the temperature of any given surface)
  • ...................................
Viperjet contest:

Sapac Viper Speed trial 2.mpg (6 min 35 sec)
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Last edited by efflux RC; Dec 09, 2012 at 03:25 AM. Reason: added text
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Old Dec 09, 2012, 03:52 AM
Lee Liddle
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Carrollton, Tx
Joined Dec 2006
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The 1/2 scale version of what my first attempt will look like is just about ready to maiden.
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Old Dec 09, 2012, 11:42 AM
Caution:Makes sharp left turns
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United States, CA, Lake Forest
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That's really cool looking, btw.
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Old Dec 09, 2012, 12:20 PM
Lee Liddle
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Carrollton, Tx
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Thanks Troy, here`s the thread in the micro edf section.

http://www.rcgroups.com/forums/showthread.php?t=1755553
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Old Dec 09, 2012, 06:37 PM
Lee Liddle
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Carrollton, Tx
Joined Dec 2006
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Quote:
Originally Posted by Knife Liddle View Post
The 1/2 scale version of what my first attempt will look like is just about ready to maiden.
I did a quick maiden on the 35mm speed jet. It flew great, even in the 15mph wind.

It needs no reflex for level flight! I had it set up with some reflex to start, and I actually ran out of down trim trying to get it dialed in. I may need to shift the CG forward a little bit so that it doesn`t need down trim. LOL

I know I promised to cut some balsa on the 70mm this weekend, but test flying the Mini Me will have to do. I need to make it to the hobby shop to pick up some balsa and ca kicker.

I`m also going to draw up some basic plans before I get started. But it won`t be long.
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Old Dec 09, 2012, 11:48 PM
EDF Addicted
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Ocala,Florida
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Getting back on my design since my Phazer is gone, I'm going with a f5d style frame but scratchbuilt, with hotliner wings I've had waiting.
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Old Dec 10, 2012, 03:37 AM
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Australia
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this sounds like a great challenge for all!!

im thinking about a HET 1w40 on 7s burst running in a Velocity Mirage 2000
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Old Dec 10, 2012, 11:56 PM
F-OFF
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Joined Mar 2007
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I've been doodling in my note pad and I think I have my design roughed out!

Hope to get cutting on some foam in a day or 2.

This thread really is a great idea, Looking forward to the build!
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Old Dec 11, 2012, 05:56 AM
Aka: Tom Jenkins
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Palm Beach County, Fl.
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I do have a question about the temperature and its effects on Doppler, how many mph is affected by 1 degree of temp? or is it really nothing to worry about as long as it gets past 200..personally I think the humidity has way more effect
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Old Dec 11, 2012, 09:16 AM
Lee Liddle
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Carrollton, Tx
Joined Dec 2006
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I'm no Doppler expert but... had RCspeedo set at 90 degrees when it was really 60, and it made my 70mph micro jet read about 110mph. So I'm pretty sure it's important
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Old Dec 11, 2012, 09:18 AM
Lee Liddle
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Carrollton, Tx
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If you have RCspeedo you can use it on videos and see the difference that changing the temperature makes.
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Old Dec 11, 2012, 09:49 AM
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United States, TX, Lubbock
Joined Oct 2007
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With Hyperdyne Doppler's calculations, changing temp by 10F makes a 0.9% difference in speed.

A pass at 70F came up at 164.83mph
and same pass at 80F was 166.38mph.
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Old Dec 11, 2012, 10:58 PM
Aka: Tom Jenkins
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Palm Beach County, Fl.
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So, that explains it clearly!
Well Lee is in the lead so far with his 1/2 scale proto type posted, it looks like its doing 203mph sitting still!
Tom
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Old Dec 12, 2012, 07:36 PM
Lee Liddle
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Carrollton, Tx
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Wow! Leading the race and I haven`t even posted a video yet. Yeehaw.
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Old Dec 12, 2012, 07:41 PM
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LuvEvolution7's Avatar
St.Catharines, Ontario
Joined Jan 2009
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oh yeah, well, my plane just broke 180 MPH and I don't have a video. am I in the lead now? LOL

oh wait, I haven't even started mine yet. jeeeeez.
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