ORIGINAL: kahloq
ORIGINAL: dragonfly60
Kahloq,
What battery packs were you using that sagged, and how old/cycles wee they?
i've converted all my larger planes to glow/gas now, lost several on battery power, problem is when your glow/gas plane goes in you usually don't damage your motor, with ALL my 'sparkie' crashes either or both motor and batteries were destroyed[&o] makes for a very expensive crash!!! I wouldn't be concerned with the power/speed of the gas motors, it's easy to use a larger pitch prop to get the scale speed you want.
Cheers, Paul.
The batts were the 5s 4800 Zippy-R white shrinkwrap variety with no label from Hobbycity. I bought them 2 years ago and they dont sell them anymore. I probably had at least 50 cycles on them in various planes, but they never gave any hint of sagging until today....so i was taken by surprise. However, I should note that I havent flown the 109 in awile and had been flying my Kysoho 190 a lot using the batts one at a time. That plane is much less power hungry so the batts may have been starting to fade without me noticing until today.
Funny how a batt can read full voltage and then sag pretty bad.
Anyhow...not sure what Im going to do. I can still use the power 160 again in the new plane as I have other 5s 5000 mah turnigy and flightmax batts already on hand and those are pretty new.
I have a satio 180 in my ESM/KMP Me-109 and it flies quite well with a 16x8 prop. I just didnt want a cylinder head poking out the bottom since this CMP plane looks so good. I think on it for a bit.
Sorry to hear about the loss Kahloq. The other side of the argument is that I converted mine from electric to glow some time back to get the weight down. It flew beautifully right up to the point that the engine stopped on my base turn to land. The plane went down in a swampy area next to our field and it took me 3 days of searching to find it. No damage luckily as it landed in 6 foot reeds but it makes me appreciate the reliability of electric. Plus - as you said the cylinder poking out the bottom puts me off... I currently have no engine installed while I decide what to do .