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Dec 25, 2012, 07:22 PM
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airpower's Avatar
Lhs, four dollars.
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Dec 25, 2012, 07:24 PM
Registered User
TurboRacer's Avatar
Ahh, yeah, found another shop online for $3.79 each.. I ordered three to hold me over. Next time I'm at LHS I'll grab a handful!
Dec 25, 2012, 07:36 PM
Andres Lu
joker24458's Avatar
Ok, so I dont really get it........if I use a 160mah batt how would that kill the motor???

-joker
Dec 25, 2012, 07:45 PM
Kit Manufacturer
coreman's Avatar
Quote:
Originally Posted by pgoelz
I have to think that at some point the weight will kill the motor as well?

I have a couple 70mAH Hyperions on the way to try but I don't think I want to go much heavier.

A slightly higher pitch prop might also help, but again, at the possible expense of the motor?

Paul
The weight won't kill the battery, it will just cause the plane to fly poorly. Changing the prop might harm the motor. It flies well as designed for what it was designed for.
Latest blog entry: BluFO review by Jim T Graham
Dec 25, 2012, 07:48 PM
ancora imparo
jj604's Avatar
Generally, the bigger the capacity the lower the internal resistance so a higher capacity battery will have a higher voltage under load than a smaller one. If you look at the test graphs I showed earlier, the Hyperion 70mAh delivers about 0.3V more to the motor than the stock 30mAh at the same current drain. In fact it is worse since in practice the 70mAh will deliver more current into a constant load.

Bottom line both the voltage and current go up when you increase the battery size. Each part is not all that much -10% or so - but the combination may increase the power into the motor significantly. That power comes out as mechanical energy (more thrust and revs) but also as more heat dissipated in the motor. This little motor gets pretty hot anyway and so that is not good.

Whether it is a real problem or not can only be told from practical experience of people who fly on bigger batteries for an extended period. It may be not an issue - it may.
Quote:
Originally Posted by joker24458
Ok, so I dont really get it........if I use a 160mah batt how would that kill the motor???

-joker
Dec 25, 2012, 07:58 PM
Andres Lu
joker24458's Avatar
Ok, so for now I may just stick with the stock batt. Or even 7-10min flights with a 125mah batt. Would that be all right?

-joker
Dec 25, 2012, 08:35 PM
ancora imparo
jj604's Avatar
As Yoga Berra said, "In theory, theory and practice are the same - in practice they ain't."

Go fly it and feel how hot the motor is compared with the stock battery. If it feels about the same, stop worrying. We can over think these things sometimes - me included.
Quote:
Originally Posted by joker24458
Ok, so for now I may just stick with the stock batt. Or even 7-10min flights with a 125mah batt. Would that be all right?

-joker
Dec 25, 2012, 08:36 PM
AMA Another Mans Airplane
cale10's Avatar
anyone thought of my jittering servo issue yet?
Dec 25, 2012, 08:43 PM
Registered User
TurboRacer's Avatar
Cale10, if it's new, just call HH or if gotten from LHS bring it back and get a new one.
Dec 25, 2012, 09:03 PM
Andres Lu
joker24458's Avatar
Ok, I did that little experiment, I couldnt tell if the motor was any hotter. I think I will still fly with the 125 but not the 160. BTW I did get it stuck in the Christmas tree, but it was low so I got it down!

-joker
Dec 25, 2012, 09:06 PM
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airpower's Avatar
Cale, only one thing matters, does it fly exactly as it should?
Dec 25, 2012, 09:11 PM
Registered User
pgoelz's Avatar
Quote:
Originally Posted by jj604
Bottom line both the voltage and current go up when you increase the battery size. Each part is not all that much -10% or so - but the combination may increase the power into the motor significantly. That power comes out as mechanical energy (more thrust and revs) but also as more heat dissipated in the motor. This little motor gets pretty hot anyway and so that is not good.
Heat isn't the only issue here. What is also potentially harmful is increased brush wear from the higher available current. Imagine what is going on at the brush-comm interface of those near microscopic brushes.

I have only flown mine with the stock 30mAH batteries. I did try it once on a 160mAH cell and didn't see a major performance increase so I went back to the 30mAH cells. I am going to try the Hyperion 70mAH cells though.... I figure one more gram probably won't hurt too much.

Paul
Dec 25, 2012, 09:18 PM
AMA Another Mans Airplane
cale10's Avatar
Quote:
Originally Posted by airpower
Cale, only one thing matters, does it fly exactly as it should?
yep exactly. just every so often i'll give full up and then center it and it'll jitter a bit. it dosent always do it thoug. i figures it got some dust in it or something.
Dec 25, 2012, 09:39 PM
Registered User
Got one of these and at first I was nervous that I would not be able to fly it in our family room. However after a few test crashes I was doing circuits in our 16 x16 room. This is just awesome, under a blizzard warning now and looking forward to more flights in the warmth of my family room.
Dec 25, 2012, 10:02 PM
Have fun
airpower's Avatar
Cale get deoxit f, it's as vital with HH as is using a programmable tx.


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