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Gyro Hobbies . E-flite . Next D

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e-E-Flite Blade CP CX 400-3D > 1050Mah Lipos with blade?
 
 
racerdude
Heliman
Location: NYC

I am just learning how to fly, I have a stock Blade CP. Just bought 2 1050 MAH 3-cell LIPOS off e-bay. After upgrade, The lipos got real hot and lasted only 2 minutes each instead of like 20 as expected, still using flat blades(slightly beat up, but flew good with the stock battery) I changed to 9-teeth motor that was included with the acro kit. I already had the heatsinks on, it helped but still barely able to hover, and had very little power, if I went up full throttle, the blade actually went down instead of up. I decreased the pitch of the of the blades, it helped a bit more, but the heli still does not seem to have much power, and is very unstable. and the lipos get real hot. Still can only hover only a few feel off the ground.

Do you think it can be the LIPOS or am I doing something wrong?

Is it also possible to hook up the 2 lipos in parallel to do basic hovering and forward flight, that means 2100MAH, because it seemed like the heli was not getting enough amps. Maybe It will be more stable with the weight!!
08-01-2005 Over year old.
 
 
Plasma
Heliman
Location: Ottawa, ON

Do those batteries give the "C" rating (max discharge)?
The only other thing would be to double check the gear
mesh, that it's not too tight when you changed out the motor.
Was the motor hot as well or just the battery?

Scott
08-02-2005 Over year old.
 
 
MadRCPilot77
Heliman
Location: Central IL

Yeah - if those cells are rated at 6C or less, they could easily not be up to the task of flying the Blade. With the stock motors (and assuming nothing's binding or causing extra friction), the motors shouldn't ever draw more than 8A. 1050 cells only have a discharge rate of 6.3A at 6C, which means you'd be at the pack limit pretty much the whole flight, if not over. This could easily account for why the packs are getting so hot.

As for the parallel question, it would work, but the heli wouldn't fly very well due to the extra weight.
08-02-2005 Over year old.
 
 
chuckhager
Key Veteran
Location: Clovis, CA

What's the pitch range on your blades from low to high throttle? Almost sounds like you may have so much positive pitch that you are stalling the blades?
08-02-2005 Over year old.
HOMEPAGE  
 
 
Qwik Gixxer
Heliman
Location: Gilbert Arizona, USA

Quote 
you charged them properly right? Yes that mean with a li-po charger

That was my first thought as well.

I Hate waking up to hear :Just relax, the Ambulance is on the way
08-02-2005 Over year old.
 
 
racerdude
Heliman
Location: NYC

Thanks for all your helpful hints, The batteries are very generic, They have no C ratings printed on them. Search on e-bay for "2 pcs li-po" and you will see an item by the seller R/CMODELFUN

Sounded like a good deal. I charged them fully with the included charger, it-says LI-Ion charger instead of Li-poly, I assume that charges it to 4.1 V instead of 4.2, whic is about 95% (4.1V-3V)/(4.2V-3V)~=.954
I checked with the gear mesh, and put a paper between the gears and turned them, it turned with some resistance, so I think the distance is fine, the gears run freely, but do feel a little different than the 10 teeth.
The Heli has extra weight like homemade training gear made of 4 ping pong balls and 2 crossed fiber sticks. The standard battery handles it fine.

Chuckhager: I actually have to decrease the blade pitch to get it to work with the lipos, it works fine with stock battery even with higher blade pitch. with the lipos it seems to stall more and more as I give more throttle.

The motor and the battery get hot, even with a lot of holes cut on the canopy. If I let the heli rest for 30 seconds it works fine for about another 30 seconds and then seems like the battery is dying. But the battery has pleny to juice left in it.

MadRCPilot77 and Plasma: I think I am going over the C rating, I think all of the following account a bit to it:
The extra weight of the training gear
The slightly beat up flat blades which do cause extra friction in air.
Slightly worn out plastic gear in the gear mesh.

I just want to hover and so some forward and easy flying(I am still learning) no acrobatics. You think it is safe to hook up the 2 lipos in parallel, that way there is less load (less current drawn) for each even with the extra weight of the second lipo, it seems like both of them put together weigh the same as the stock battery. They won't blow up or anything?
08-02-2005 Over year old.
 
 
MadRCPilot77
Heliman
Location: Central IL

Quote 
MadRCPilot77 and Plasma: I think I am going over the C rating, I think all of the following account a bit to it:
The extra weight of the training gear
The slightly beat up flat blades which do cause extra friction in air.
Slightly worn out plastic gear in the gear mesh.

I just want to hover and so some forward and easy flying(I am still learning) no acrobatics. You think it is safe to hook up the 2 lipos in parallel, that way there is less load (less current drawn) for each even with the extra weight of the second lipo, it seems like both of them put together weigh the same as the stock battery. They won't blow up or anything?


As far as safety goes, there is no issue with runign the two packs in parallel. The weight will certainly be a problem though, as most of the guys I know that are flying with Lipo's say the Tunder Power 1320 is about as big as you can get without comproising performance in hover and FF.

Ozzy said it best - Flyin' High Again!
08-02-2005 Over year old.
 
 
racerdude
Heliman
Location: NYC

Just hooked up both the LiPos in parallel, the heli is pretty heavy, but it is rock stable, I love it!!!(At least for learning)

If you want to compare it with cars, One Lipo is like an old VW beetle, if you go uphill it will slow down, but still light and easy to handle.

With 2 Lipos 2100MAH, it handels like a BMW 745i stable and with precision, but with the extra weight it takes extra effort if it get's away from you, but that is hard to do anyway.

My experience with 2 1050Mah Lipo in parallel:
Pros:
*Very Stable
*Plenty of Power
*Very good response and steady
*Lipo stay cool!!
Cons:
*Heavy so landings might be hard if not careful.
*Extra weight limits acrobatics(none!!) limited to hovering and forward flight.
*Motor gets very hot because of the extra load.
*More damage if the Heli crashes.
08-03-2005 Over year old.
 
 
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e-E-Flite Blade CP CX 400-3D > 1050Mah Lipos with blade?
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