Espritmodel.com Telemetry Radio
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Old Oct 21, 2010, 06:28 PM
Sippin the Koolaid!
losifanatic's Avatar
United States, NC, Hertford
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My manual states that you dont need all that on a 450 size heli. Only the 3mm pad. I am 1/2 tempted to try both pads and the plate though just to see if it makes a difference
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Old Oct 21, 2010, 07:24 PM
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Barak1001's Avatar
USA, AL, Hanceville
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Quote:
Originally Posted by gtfreeflyer View Post
Which LiPo are you using that has zero voltage drop under load, and maintains a full charge after spool up and lift off? I want one of those!
No one said it was exact. I actually took off 15% due to the efficiency of the motor being in question, pretty sure that's good enough. Also no one said it would stay that way from lift off to landing.

Even if you do the math at 11.1v his head speed is greater than 3000 rpm and it's no wonder that his flight times are so short.

Why is it that people on a forum tend to try and nitpick things that should be common sense?
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Old Oct 21, 2010, 09:24 PM
Fix, Fix, Fly, Fix, Fix, Fly
mountainsax's Avatar
Colorado
Joined Apr 2009
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Thanks for the link to the head speed site! I'll give it a shot this weekend. I don't have a cell phone so I'll have to use the laptop...and not hit the computer with the heli!!
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Old Oct 21, 2010, 09:28 PM
master of the universe
captaingeek's Avatar
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could you help me calculate my HS? i have this motor:

http://www.hobbycity.com/hobbycity/s...idProduct=8138
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Old Oct 21, 2010, 09:31 PM
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ohh with a 14 t pinion
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Old Oct 21, 2010, 09:43 PM
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I gave the formula for it last page. Not that hard to do.
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Old Oct 21, 2010, 10:11 PM
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Sydney, Australia
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Quote:
Originally Posted by losifanatic View Post
My manual states that you dont need all that on a 450 size heli. Only the 3mm pad. I am 1/2 tempted to try both pads and the plate though just to see if it makes a difference
I went the full hog...3mm foam - steel plate - 1mm foam - gyro. Works fine, but having said that, probably would have worked just as well with only the 3mm like the manual says, and would have saved 8 grams.
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Old Oct 21, 2010, 10:12 PM
Yes, I know it's upside down.
Sydney, Australia
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Well, after putting it off for weeks, this morning I finally joined the "flip" club. Got them going forward, backwards and sideways on both the HK450 and Walkera HM-1#A, plus a few loops for good measure. And to make it even better, brought them both home in one piece. I'm stoked!!

No video unfortunately, but definitely next week.
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Old Oct 21, 2010, 10:31 PM
Not a six pack
rocketscience's Avatar
USA, IL, Chicago
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Quote:
Originally Posted by captaingeek View Post
could you help me calculate my HS? i have this motor:
headspeed calc 1

headspeed calc 2

Presets for trex 450 on both
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Old Oct 21, 2010, 10:54 PM
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thanks! here she is in action
trex 450 gt pro md 500 hughes scale heli (3 min 17 sec)
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Old Oct 21, 2010, 11:38 PM
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According to Heli Headspeed you're running about 3850 rpm. I just used the mic to check it while the video was playing.

Edit:

Just ran it through again and it's showing 2200 head speed. Apparently the audio isn't clear enough for it to be accurate?

Edit 2:

Apparently 2200 is what it actually is. I moved the mic closer to the speaker and ran it through again. That's if the program is actually accurate (I haven't got a visual tach to use to locally to test the accuracy of the program).
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Last edited by Barak1001; Oct 21, 2010 at 11:44 PM.
Old Oct 21, 2010, 11:45 PM
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whoppers didn't mean to go that high!! Guss I have to treat it apart again rip get to the motor
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Old Oct 21, 2010, 11:46 PM
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Look up again, apparently the readings were off because of how I had the mic. Your headspeed is pretty stable at 2200 rpm when you're hovering (If this program is accurate anyway).
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Old Oct 22, 2010, 04:07 AM
Yes, I know it's upside down.
Sydney, Australia
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Quote:
Originally Posted by captaingeek View Post
whoppers didn't mean to go that high!! Guss I have to treat it apart again rip get to the motor
Captaingeek, I would recommend spending $10 at Hobby King and getting yourself an optical tacho. No more guess work.

http://www.hobbyking.com/hobbyking/s...dProduct=10783
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Old Oct 22, 2010, 05:45 AM
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Australia, VIC, Melbourne
Joined Aug 2010
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Quote:
Originally Posted by captaingeek View Post
whoppers didn't mean to go that high!! Guss I have to treat it apart again rip get to the motor
CG man:
With 2200mah 3s lipo?

Calculated HS @ 100 % throttle:2818

But that's not what you'd be running you would be running this

Calculated HS @ 85 % throttle: 2395

Now give and take the resistance from the blades, the load, and you're not using a governor, etc etc... hence you're actual HS at the time of the vid is 2200, and that's fine. 2100-2200 perfect for scale

Also do your calculations first before you buy the heli stuff
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