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Ron’s HeliProz South . Century Helicopter . MTA Hobbies

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Audacity Models Pantera 50 - Tiger 50 > ePantera
 
 
MaxAdventure
Senior Heliman
Location: Boulder, Colorado

Well, I think I have the final setup. I did some more testing Thursday and I'm pretty happy.

I've taken a Pantera 50, put in a Z50 780kV w/9T pinion and I'm running about 1920RPM head speed. Comes in just under 8lbs (EDIT: smoking crack! rechecking weights...)and flies great. (original batteries, the new ones are a bit heavier and I haven't checked - by the way, a 5 amp hour lipo fire is pretty impressive.)

I'll get the eLogger on this weekend and see what I can capture next week for data, if anyone is interested.



-da (Max)
AMA 198798
issues? I have subscriptions...
06-14-2008 04:40 PM
 
 
billm
Key Veteran
Location: Liberty Lake, WA

Nice!
See. Even with an electric, you still get smoke.

My name is Billm. Cough, and I'm a Heli Holic
06-14-2008 05:27 PM
 
 
tim tompkins
Veteran
Location: Boston, Georgia sw Ga. Thomas County

What are you using for battery packs? 8S? 10S? What mha's? What esc? I'm full of questions. TimT
06-15-2008 12:36 AM
 
 
MaxAdventure
Senior Heliman
Location: Boulder, Colorado

Basic run down:

Z50-800 780kV
8S 6Ah LiPo for 29.6V nom (two Common Sense 4S3P 15C)
CC HV85 in gov mode
9.67:1 gearing (9T pinion on stock main gear)
620mm mains

so far logged ~2200 Watts with 90A peak

Started with a pair of Zippy H 4S1P 5Ah, but due to a slight, um 'mishap' I am down to one and unable to source another.

-da

-da (Max)
AMA 198798
issues? I have subscriptions...
06-15-2008 05:57 AM
 
 
MaxAdventure
Senior Heliman
Location: Boulder, Colorado

took time for a six minute flight today;

Idle2 I have -13+13 on my pitch. debatable that I have more than I should as an intermediate flier. Regardless, the eLogger provided the following;
2678mAh in 6 min (edit: calculates to 10min45sec flying to 80% capacity)
one full-on climb out:
max 2739.99 watts (that's 3.67 HP)
max 104.54 Amps

mostly flying circuits, 0-5mph wind estimated, 91.1 °F
flying weight measured at 9.4lbs, I need to check where my original 8.6lbs measurement came from. (edit: new batteries are 12.5 oz heavier)

smooooooothhhhhh spool up, take off.

more tuning needed, then I'll log against the .50 hyper. RPM sensor failed, I'll work on that one to confirm the gov.

-da (Max)
AMA 198798
issues? I have subscriptions...
06-16-2008 05:56 AM
 
 
MaxAdventure
Senior Heliman
Location: Boulder, Colorado

a few more numbers that are interesting:

not including the power climb, and a few spikes, the range of amps and watts for the flight:

Amps: 15 to 45
Watts: 400 to 1200

can you tell I LOVE the ET eLogger V3 ?!?!

-da (Max)
AMA 198798
issues? I have subscriptions...
06-16-2008 04:07 PM
 
 
tim tompkins
Veteran
Location: Boston, Georgia sw Ga. Thomas County

This is good info. Thanks for your update. I have left the nitro fleet at home for quite a while. I'm flying a Thunder Tiger E-550 lately. I have a Z-power 30/1100 with a castle creations phoenix-80 esc. on 6S 5000 battery. I maxed out the collective, just like my little helis. The instant torque from the electric motors make it fly like my simulator. I almost turned my tiger into an electric. I know John has done some research but now that batteries are getting so much better and cheaper he might reconsider. Nitro is going to be an issue soon and this might be a new way to sell machines. The mechanics are the same, just the frames to fit in some batteries. The myth of needing big $ batteries has been blown away by the sucess of the T-Rex 600 on 6S by the thousands who fly them. I paid $307.00 shipped priorty mail, for 2 6S 5000 packs. They seem to be all I can use in 6 mins of hard flight. I recharge aprox. 3400 mha's every flight. I take a mini or 2 with 5 batteries and my 550 with 3 packs and when I'm done, I've had enough!
One more little note if I may? I'm no "greeney" but I love new tech. I just wish I could get the thing to smoke and smell like nitro when it's in the air. I like it not to stink up my Yukon XL on the way home though. So there are some trade offs. TimT
06-16-2008 08:37 PM
 
 
MaxAdventure
Senior Heliman
Location: Boulder, Colorado

the twins weight and latest flight comparisons

just for comparison, finally got around to weighing the Pantera with the os 50hyper, as I have it set - Ready To Fly. that's with fuel.

unfortunately, the best scale I have for things over 7lbs is my digital bathroom scale. I took several readings with me holding the heli to get into the scales normal range, and pulled the most consistent number.

nitro Pantera = 8.6lbs (3200mAh rx batt, no horizontal fin to assist balance)
ePantera w/original 5Ah cells = 8.6lbs (still using the 6Ah @ 9.4lbs)

They also seem to fly very close, and my latest figures confirm I'm good for about 10min flight times with both machines, although I've been stopping around 8 min. I'm still tuning and adjusting both machines, so valid comparison is yet to come. Just had some really good flights yesterday so I'm all jazzed up.

I'm wondering about upping the voltage with a lower kV motor, to try and reduce the amps. It's easy to peak to 90 with a climb out and I wonder if a 3D pilot wouldn't tax the system too much. Big packs are challenging to source, regardless.

-da (Max)
AMA 198798
issues? I have subscriptions...
06-29-2008 07:31 PM
 
 
pertti
Heliman
Location: deltona,FL

Anyone tried supercapacitors parallel to lipo to deliver high peak. For example TPL PowerBurst® 10F ultracapacitors cost about $10 each. A $100 pack connected series would be physically quite large but very light 40 grams total = 1.4oz.
07-01-2008 06:10 AM
 
 
MaxAdventure
Senior Heliman
Location: Boulder, Colorado

ePantera report - 10 minutes; hits 10min easy

So, I thought I'd put things together the first time pretty good, but further flying, testing, and having some show and tell showed that I had some misalignment in the power train. Putting another conversion together helped as that one went together better in the first place. The other thing this really indicated was just how invaluable another set of eyes is. I'm just not perfect and it sure is nice to work with someone one these projects!

Point being, the system is a lot more efficient than I previously thought (once the drive train was fixed)

Yesterdays numbers:

8 min flight
Maxed at 84Amps (including bogging the motor)
Ave 24.8 Amps
3663 mAh
2183 max Watts

so, this means with the big 6Ah pack I can safely fly over 10 minutes and still leave 20% reserve on the pack.

As for signal, for the first time I've logged antenna fade events, a total of 8 between two RXs. I was somewhat expecting this with the big motor and big amps.

I'm happy to post/send logs if anyone is interested.

-da (Max)
AMA 198798
issues? I have subscriptions...
08-31-2008 04:24 PM
 
 
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Audacity Models Pantera 50 - Tiger 50 > ePantera
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