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Old Nov 09, 2012, 09:40 PM
The wheels touch down FIRST??
BJ64's Avatar
Australia, VIC, Melbourne
Joined Jun 2009
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Just did some static testing on the HET Typhoon 600-43 1100kV swinging the 14x9 Prop:

3S 2200mAh - 43A for 1.5kg thrust - 440W
4S 2200mAh - 66A for 2.4kg thrust - 936W

But yowsa, that inrunner gets quite hot.

BJ
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Last edited by BJ64; Nov 09, 2012 at 09:49 PM.
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Old Nov 09, 2012, 10:00 PM
Dir. of Innovation at Alert 5
Demon 6's Avatar
United States, FL, Fort Lauderdale
Joined Jul 2011
652 Posts
Quote:
Originally Posted by BJ64 View Post
Just did some static testing on the HET Typhoon 600-43 1100kV swinging the 14x9 Prop:

3S 2200mAh - 43A for 1.5kg thrust - 440W
4S 2200mAh - 66A for 2.4kg thrust - 936W

But yowsa, that inrunner gets quite hot.

BJ
You like them big props eh? Those numbers look acceptable... I'm expecting a maiden video by the end of this weekend
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Old Nov 09, 2012, 10:02 PM
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G'day BJH
Is this for the Siren, if so, why?
Neal
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Old Nov 09, 2012, 11:00 PM
The wheels touch down FIRST??
BJ64's Avatar
Australia, VIC, Melbourne
Joined Jun 2009
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Yep - it's for the Siren.

Why? Coz I blew up my SK3548 960kV.

I must say, I expected a LOT more power/thrust from this big-arsed HET Typhoon 600-43 1100kV motor.

That old SK had roughly 300g more thrust for the same Amp draw on both 3S & 4S (the same batteries for this HET test) running the 14x9 Prop - only problem was the motor was only rated to 840W, and it was peaking at 900+W on 4S. Enough to blow it up enventually.

I'm a bit perplexed with this HET. It doesn't even sound like it's running all that hard - certainly not 1100kV. The SK 900kV was fairly screaming on 4S/14x9 prop.

I've tried the HET with both brake on, and brake off - as well as Low, Medium, and High ESC timing. No diff whatsoever - same thrust, Amps and Watts.

Any ideas anyone?

BJ
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Old Nov 10, 2012, 12:00 AM
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Got a Tacho?
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Old Nov 10, 2012, 12:05 AM
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Way off topic!
I recieved a tiny vid cam I got on ebay for $1.99, (only bid) free postage, but had to buy a cheapish micro sd card though, going to attatch it to my clouds fly and if weather ok and wife does not have other ideas, I was going to give it a go, curious to see what there like.
Neal
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Old Nov 10, 2012, 03:48 AM
The wheels touch down FIRST??
BJ64's Avatar
Australia, VIC, Melbourne
Joined Jun 2009
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And yah - I have a tacho.

Did a couple more runs with the tacho lead connected and logging.

Here's what I got on 4S, rounded out:

14x9 - 65A, 950W, 2.5kg thrust, 6750 rpm
13x6.5 - 45A, 550W, 2.25kg thrust, 8300 rpm
11x7 - 35A, 450W, 1.5kg thrust, 9500 rpm

Note: The 4S was getting a bit tired for the 11x7 then the 13x6.5 tests.

The recommended prop for the HET 600-43 is a 12x6 (couldn't find where I put mine).

The 13x6.5 prop seems to be in the ballpark - only 0.25kg less thrust than the 14x9, but a whole 20A lighter on the ESC, and the motor didn't get anywhere near as hot. I'll do another couple of runs on a freshly charged 4S and get more info on the 13x6.5 (expecting a bit more thrust and current draw on a fully charged pack).

BJ

PS - forgot to mention, the SK3548 weighs 170 grams, the HET 600-43 weighs 290 grams *irk* (it's one big mutha of a motor...)

How much difference do you guys reckon the extra 120 grams (almost double the weight of the SK3548) will make to the CG?
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Last edited by BJ64; Nov 10, 2012 at 04:43 AM.
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Old Nov 10, 2012, 05:00 AM
Dir. of Innovation at Alert 5
Demon 6's Avatar
United States, FL, Fort Lauderdale
Joined Jul 2011
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I'd say the batt will be 1/2 way into the bay/nose.... Not to bad... The weight/power/cost equation is looking good:
Weight : slightly more
Power: equivalent
Cost : Free!

So run her till the magical smoke genie appears.... Then pick up a geared ammo setup, or the Redliner, or the new H. King "Hotliner" motor looks interesting (870Kv)...
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Old Nov 10, 2012, 06:13 AM
The wheels touch down FIRST??
BJ64's Avatar
Australia, VIC, Melbourne
Joined Jun 2009
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Well - it's done.

The HET is in and all hooked up. Not all I thought it would be, but she should be just shy of 1kW with a fresh LiPo

And boy - that's one heavy sucker of a motor. Hope it doesn't screw the CG up too much. I'll take some 7g wheel-weights with me to tape to the tail if the need be.

What's the absolute max nose-heavy CG for these things? Anyone know? Still - better a bit nose-heavy than tail heavy. "A nose-heavy plane may fly like a pig, but a tail-heavy plane only flies once" LoL.

Must say one thing I'm really impressed with - hell that inrunner is silky-smooth. You can hardly tell that the motor is running (once you get past the start-up jitters - darn thing 'cogs' a bit until the Amps kick in. The SK3548 was even worse).

Soooo... weez a-goin Siren flying in the morning

BJ

PS - no smoke for this one - good for 80A with nominal power of 1.4kW (probably on 5S or 6S in and EDF), and I'm only pulling mid 60's WOT with a LiPo capable of 100W continuous

The 13x6.5 runs cooler than the 14x9, and I'm hoping the firewall slots and NACA ducts will bring at least some air past the motor (can't fit the obstropolously huge heat-sink that comes with the 600-43 into the nose )

PPS - I'll strap-on the VHoldR HD if I remember. See if I can get a couple of nice, clear fast-passes on Vid
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Last edited by BJ64; Nov 10, 2012 at 06:28 AM.
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Old Nov 10, 2012, 06:32 AM
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AAhhhh bugger you BJ, Im a goin to to stay inside and keep dry! Wont complain we need the rain, if I am lucky I might fly in the arvo, and do a bit on the siren
Good luck with the new set-up
Neal
Ps. Do vid the flight please, that would be really good to see, might even reconize surounds
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Old Nov 10, 2012, 06:59 AM
The wheels touch down FIRST??
BJ64's Avatar
Australia, VIC, Melbourne
Joined Jun 2009
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No probs Neal - will do.

Just itching to get this Siren back up there again.

It's a pity I didn't get the engine-blow on film when I was on Hollies in SA last month - was truly a 'Roulette' ('Merikan buddies think "Blue Angels") moment.

She let go at 85deg vertical, full noise. Smoke trail was an absolute pearler. Lucky I caught it before the Speedy let go (not running a separate BEC/UBEC, so the Rx would have carked it if the ESC went off-line).

Finally got the old SK3548 out this arvo, and man - those windings are frikken fried Motor still stinks, too.

Looking forward to giving the rebuild a run in the morning

Mate, you have to fast-track your build if you can. Just saying (I realise you've got a lot on in the next few months) - I think you'll be pleasantly surprised by how well this thing flies for what it is. While it isn't an Alex Enigma F5B punching 3kW+ of power, it also isn't a 2-grand+ rig.

I really hope you enjoy flying your Siren when it all comes together - I know I do

BJ
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Old Nov 10, 2012, 07:21 AM
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I am planning on it being in the air end Jan latest
Neal
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Old Nov 10, 2012, 07:35 AM
The wheels touch down FIRST??
BJ64's Avatar
Australia, VIC, Melbourne
Joined Jun 2009
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As the Actress said to the Bishop - "Get it up there, man!"

LoL

BJ
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Old Nov 10, 2012, 11:05 AM
Dir. of Innovation at Alert 5
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United States, FL, Fort Lauderdale
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I flew one at 60oz AUW... But it was pathetic on the climb outs... It puts a lot of stress on the wing attachment areas...
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Old Nov 10, 2012, 08:25 PM
The wheels touch down FIRST??
BJ64's Avatar
Australia, VIC, Melbourne
Joined Jun 2009
23,934 Posts
Just weighed my new set-up, and it comes out at 1.54kg (54oz) AUW compared to 1.42 (50oz) using the SK motor

The HET was comfortable producting 2.25kg thrust on 4S pushing an AeroNaut 13x6.5, so the power-to-weight looks good.

Hope the wing saddle copes with it

The CG now sits at 75mm - too far forward?

BJ
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Last edited by BJ64; Nov 10, 2012 at 08:34 PM.
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