osterizer
Posts: 1734
Score: 100
Joined: 3/10/2007
Last Login: 2/2/2013
From: Sykesville,
MD, USA
Status: offline
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quote:
ORIGINAL: joizeex
well, osterizer, instead of being all mysterious about what magical HK batts you're using, why not tell the rest of the board, so that others can benefit from it?  i for one, wouldn't mind cheaper packs for the HBK, IF they last a while. did yours?
I wasn't being mysterious- just responding to the assertion that the HK packs in general are too heavy and puffed, when talking about larger helicopters. The important point that might have been missed there, is the scale; running a 600 you're going to want between 2500 and 3500 W. Using 10S packs (42V by spec, generally 36-38V in reality), that means you're going to use up to about 60-80A. You'll use 5000-10000mAh packs (two 5Ah packs in series, or one 10Ah), for example; even if you use two 5Ah packs in series, that means that at peak load, the hardest you'll push them in a burst, you'll ask for about 16C. At normal hover, cruise, and easier aerobatics, you're drawing 4-8C roughly. Compare that to your average King setup that pulls 5-10C (depending on the pack) just to get off the ground! The packs in my Logo 600, during aerobatic flight, are usually under less stress than the stock King pack in a hover. When you're dealing with different helicopters, the numbers change.
For the specifics, it's a Logo 600 3D Vbar, 2xZippy H 5S in series; I use 3.3, 4, 4.8 and 5Ah packs in it with a Scorpion 4025-560 motor.
quote:
ORIGINAL: joizeex
on the subject of power, how exactly did you measure that your 600mm electric helis are more powerful than .50 nitros? i'm not trying to start anything, but if you're going to make a statement like that, for others to base their purchase decision on, please provide some basis for your statements. did you try flying a .50 and you ''felt'' it had less power? ''feel'' is a very subjective measure. did you drag race against a nitro straight up into the air? was the nitro tuned and setup properly? was it a **** engine or something good? was it using 10%, 30% fuel?
I'm not relying on feel- the performance of a heli is a lot more complex than that. Talking power alone, though, I've measured 2.5kW through the Logo, at about 7.5 lbs all-up, which is quite light for a .50. If you were to take a generous interpretation (i.e., the engine actually puts out the 2 HP or so that O.S. says is the max for the .50 SX-H), it's still outclassed; 2.5kW is a little over 3 1/4 HP, or 60% greater power. That is just my heli, which is moderately powered. I was talking with the Mikado team a couple of weeks ago at XFC, and one of the differences between their helis and mine is that they were using the 4035 motor, which is rated for 4.2kW, a little over 5 HP, or 2 1/2 times the power of an OS .50- you can't tune an engine to overcome any of those gaps.
I have had glow powered aircraft off and on for the last 35 years. They've improved greatly over what I had to start with, and yes, modern engines require a lot less maintenance and fiddling than they used to (though the cleanup hasn't really changed). They have a lot to recommend them; if nothing else, you're not going to crash a glow heli and taco a case of fuel! But the post I responded to said the HK packs were heavy and puffed, so they weren't useful for larger helis. I responded because it was obvious that that assertion wasn't backed by actual experience with larger helis.
Maybe if you run a 1500 mAh pack in a King at 10C continuous then people have problems; I don't know, since I've never used them in my King. But I've used LoongMax, Zippy, FlightMax, and Turnigy packs in every helicopter class larger than the King (325, 425, 550, and 600), and they work fine if you know how to create a power system with the parts matched up right.
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RE: Honeybee King v2 tuner shop - 
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