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T-motor F80/2500KV testing with 7x4.5 Dalprop
#1
Heya FPV-buddies,
I'm roaming around my upcoming Helix 7"-build where I should be fine-tuning presentations for Cairo (departure this sunday). Well, I'm an addict, and I know that I'll be squeezing in as much fpv-quad-stuff as I possibly can. There's still time on the plane and in the hotel ROFL
Okay,
I know this is an unreasonable setup, but I love T-motors and I got those F80s really cheap from ImpulseRC together with the frame. Couldn't resist, despite the specs: 2500KV on such a brick..
Especially since I'll be loading them with 7 inch x 4.5 bi-blads from HQ-Prop, really neat blades, but that's quite a pitch for such a prop size. I just tested them my improvised thrust meter and blew a 30A littlebee ESC when I tried 4s, didn't even get to mid-throttle! *whooohhh..
I actually laughed about it Big Grin
Full throttle on 3s was 13N (1333g) of thrust, *heck! Basically, that's already plenty for such a nimble aircraft as the Helix. 4s will be devastating..
The Amps drawn were of course ridiculous, that's why the littlebee would not stand up to it: Already 3s went well beyond 50A, and as 4s got the motors asking beyond 64A (..a proper test will be following as soon as I got some massive ESCs for them..) in a blink.
The problem is that I'd really like to keep the proper build of the Helix, thus sporting the fairings. They are really tight, though, already the small version of the 35A littlebees (Dshot) fit in just alright.
So the options are running the 7 inch just on 3s (..which would mean resurrection for a bunch of neglected lipos), or looking like Indiana Jones for some small, but high-Amp ESCs.
Any suggestions??
The fairings may be shaved and thermically altered a little, but more than 2-3 mm will be hard to achieve..

*Doh..
Dunno.. Rolleyes
I should be working on my presentations anyway, let's postpone this a bit. Other builds waiting anyway, my addiction is merciless ROFL

So long, just wanted to share a laugh about evaporating littlebee-ESCs..!

Take care and have fun, everybody!
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#2
Sorry about the confusion of the props: They're actually really HQ-Props, 7 x 4.5...
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#3
lol that's insane Big Grin

Only bigger escs that i could find are the Hobbywing xrotor 50A, but they're real bricks, really heavy.

Have a look at them here (hint hint local supplier), or the smaller 40A versions here which can also take bursts of up to 60A for 10 seconds. However i THINK they are "old" by now and not running blheli standards i.e. newer motor protocols...
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#4
(21-Apr-2017, 06:35 PM)fftunes Wrote: lol that's insane Big Grin

I agree Big Grin

And I shouldn't encourage you, but...  Banggood has some EMAX BLHeli ESCs in 40, 50, 60, and 80A versions (the 40 and 50s only weigh 41 grams - then the weights jump up).  http://www.banggood.com/EMAX-BLHeli-Seri...63632.html

You know those motors are  only rated for 45A, correct?  (Not to stop you or anything - can't wait to see your results!)

Have you thought about 7030s for props?  (Nah - too tame, I know.) Big Grin 

Smokin' !!  Good luck!
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  • campagnium
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#5
(21-Apr-2017, 06:35 PM)fftunes Wrote: lol that's insane Big Grin

Only bigger escs that i could find are the Hobbywing xrotor 50A, but they're real bricks, really heavy.

Have a look at them here (hint hint local supplier), or the smaller 40A versions here which can also take bursts of up to 60A for 10 seconds. However i THINK they are "old" by now and not running blheli standards i.e. newer motor protocols...

*heeehh-heehh, I know, I know. My psychiatrist agrees too. Last year I got the diagnose of multiple personality, but today we get along well ROFL Just kidding..
Did some research too! - Do you guys know www.miniquadtestbench.com ? Greatgreat site, lots and lots of very useful and objective information, not the usual propaganda-talk..
I found some ESC's, too! - www.iflight-rc.com, just pre-ordered some ipeaka 50Amp Blheli (..suited for up to Dshot 1200!!! *geeehhh...)
I might have to reconsider my choice of motors, though, I think you guys are right. It's just that I really enjoy being tickled by my insanity, so bloody entertaining! Big Grin
I'll let you know about the results,
have to pause for a week now as I'll be abroad and won't have the time for fpv - not that I haven't considered taking along my taranis & a couple of lipos, but already the choice of quad drove me up the walls..
Upon my return I might already find some other parts on my desk,  Heart
This 7-inch-Helix-ghost really follows me into my sleep, though...
I'll document, I'll document..! Especially since I'm planning to use it in the Swiss alps, way up high in the thin air, but that's another subject.
Keep it up & c ya!!
Un abrazo,
Emanuele
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  • fftunes
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#6
(21-Apr-2017, 07:12 PM)sloscotty Wrote: I agree Big Grin

And I shouldn't encourage you, but...  Banggood has some EMAX BLHeli ESCs in 40, 50, 60, and 80A versions (the 40 and 50s only weigh 41 grams - then the weights jump up).  http://www.banggood.com/EMAX-BLHeli-Seri...63632.html

You know those motors are  only rated for 45A, correct?  (Not to stop you or anything - can't wait to see your results!)

Have you thought about 7030s for props?  (Nah - too tame, I know.) Big Grin 

Smokin' !!  Good luck!

Hellooo Sir Sloscot,
..yesyes, I know! Indeed, they already get pretty warm with 3s. They might melt right onto those transplanted warpquad-arms if I overdo it.. ROFL Poop
I've always been very experimental, to the point of being detrimental, *or mental..
but you only live once, and if this is the territory where I can live my craze, I'm not leaving for nothing in the world. Fpv-quads are the ideal projection plane of the insane, it seems. Sooo many factors and variables to play with, it's truly geek-heaven!!! Better than running around and molesting people, no? ROFL ROFL ROFL
Seriously:
The prop-suggestion indeed is very reasonable! I just have to find some..
Actually ordered a haphazardous jumble of 7 inch props all across various suppliers from NY over Straya to the Netherlands one sleepless night, and can't really remember their specs. Will be a great surprise upon my return.
Pulling a couple of teeth from the initial concept would feel a little bit like a defeat, and since I've started into this hobby by repeatedly and very passionately bumping my head onto things, I might just as well keep doing so. In the meantime, I have quads that fly and that I dearly love, at least! Wink
Have mounted the new Gemfan-props onto the obsession just now. Those tri-blades with the tiny fins/winglets at the tips. Lord they feel and perform incredibly! Silent, torquey, smooth.. - I think I'm in love!
So long,
hasta priesto and thank you for the input!
Promise that I'll keep smearing my insanity all across the forum.. ROFL Heart Big Grin
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#7
..aaahh yeess,
and concerning local suppliers I've found a few in Switzerland who already got to know me, *poor fellas..
I'll keep asking and suggesting and motivating and supporting...
..because I really think this is the future!
Love to all,
E
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#8
PS: maybe even 7040 props instead of 7045 could make quite a difference.

And my "that's insane"-comment was not meant to stop you in any way lol Wink
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  • campagnium
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#9
(22-Apr-2017, 11:31 AM)fftunes Wrote: PS: maybe even 7040 props instead of 7045 could make quite a difference.

And my "that's insane"-comment was not meant to stop you in any way lol Wink

Thanks! - already ordered a couple of 7030, 7035 and 7038 (..odd number, uh?) @ multirotor insanity. Let's see, let's seeee..!!
ESC investigations continue - guess I'll have to drop the idea of keeping the Helix fairings.. Dodgy
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