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HomeAircraftHelicopterMain Discussion › Whoda Thunkit,,,,,,,,,,, 5000 Blistering R,,,,,P,,,,,M,,,,,,,,,,WH A?
03-22-2015 03:08 PM  3 years agoPost 1
icanfly

rrElite Veteran

ontario

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hehe, well, story goes like this, long version first. Go to local hs which had 2 Turnigy NanoTech 1.0 4S lipos for $26 cdn I investigate while hanging around talking about nothing. Few days later buy the pair for $50 all in and after resetting my Talon 35 in my no longer a Blade product 300 (24in rotor span) heli yesterday morn, after getting off rr and putting some round cons on, I toss one in and spool it up on the basement floor for a few seconds in idle up. I had lowered the throttle curve to 90% and assigned st2 to that setting as I still have 3 11.1v lipos to use on the same heli, th setting at 100% in st1.

My 300 has a Leopard hobby 3500kva motor back in it from a change back a few days ago, the heli ends up 10grams lighter from a week ago. When I spooled up outside yesterday afternoon I figured the lipos were charged as they read 14.7v each, no no nono noooo, battery alarm and low voltage rpm kick in with the first test flight not lasting a minute.

Go inside and charge the pair of nanotechs at 2.5amps, FIFTEEN MINUTES LATER they are fully charged, WOW that was fast. Finally put one in the heli and go outside to play. Spool up and the rpm is going, going, and still going up faster than I've ever witnessed, freaked me out. Fly a small circuit and auto down a minute later to lower th curve top end to 80%, now it is more reasonable at 4000rpm or so, hehe, and I gingerly test to make sure it doesn't need more space than I can give it. Hmm, at one point actually fly the little 300 20 ft up through the mid day sun and loose momentary sight, I don't dare move the sticks. I had sunglasses on so glare was cut drastically thank the newfangled habit of wearing shades every time. Continued test flight without harm.

That's how it be, hit the insanely curazee rpm level of 5000 omfg rpm hahahahahahahahahahaahahahahahahahahahahahah.

btw, my 300and 450 have a custom solid 3mm feathering shaft, and they both 3m nylock nuts on them, should I say eat shyt and die to the plants that get in the way, LOL. If ever need to be I may start a heli tree trimming biz out of this.

NOW, imagine a 700 heli with potential to spool up tp 5000 freaking bleeding blistring F1, Hyabusa, TopFuel dragster, maniacal R,,,,,,,,,,P,,,,,,,,,,,Mmmmmmmmmmm? WHY? for the starving kids around the planet, thas why.

Holee crap was that faster than a humming bird on crack. 4s it is, how about 6s next? yikes. Anyhow, it sounds nice.

Almost forgot to add the winds picked up quite a bit in the second lipo flight, no more ballooning, getting kicked around a little by gusts, stability was improved, and tail is solid, can you imagine 100% wot in straight line racing. Ohh yea, and I was at an fpv 250 quad race get together last night, One guy had the game on, four others could catch up, four other dudes there were in beginner mode. Never mind if my heli entered the races, game over. Interesting thing about the top dude, rpm was not the highest on his rig.

Shinning moments. 300 is now like last year when it had a Mini Punch 5700kva on 11.1v, 'cept not so hot.

What's 92% of 3500kva through 11/1 at 16v? Where's Mr. Mels rpm calculator when you need it? found it. 5410 rpm at full charge. Mini punch could do 6607 at full 3s charge, hmph, look out, I gotta oil some bearings now, Blade, you supplied great
bearings, thanks.

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03-22-2015 05:58 PM  3 years agoPost 2
Aaron29

rrProfessor

USA

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Sounds like an explosion waiting to happen

Might want to look up metal fatigue and failure analysis before taking this joy further

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03-22-2015 06:06 PM  3 years agoPost 3
icanfly

rrElite Veteran

ontario

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at 75% into the throttle and using 75% of the lipo it calculates to up to 14minute flight itme, one. Two, I've flown it in this rpm level last year and since without any catastrophe other than that caused by vibes, one tail screw tore off was all. Crashes always toasted blades and bent shafts, amazing what throttle hold can do for everything else.

It will be prudent to inspect certain components from time to time to see if they need any advice, lol. Talk to me .

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03-22-2015 07:05 PM  3 years agoPost 4
Aaron29

rrProfessor

USA

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I smell a rekit. Soon.

5000 RPM is like a PermaMcDoogle

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03-22-2015 07:14 PM  3 years agoPost 5
Ace Dude

rrProfessor

USA

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story goes like this, long version first.
Where's the short version?

  

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03-22-2015 07:15 PM  3 years agoPost 6
Aaron29

rrProfessor

USA

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Short version, the heli exploded.

You're gonna need more than bearing oil to keep this up.

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03-22-2015 08:53 PM  3 years agoPost 7
icanfly

rrElite Veteran

ontario

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short version? that happened an hour ago when I took it out using 11.1 v at 100% throttle, misjudged a difficult position near a tree, cleared the tree by a few spare inches but gained so much speed close to the ground and had to throttle cut as it hit a snow bank rsu across the yard and went head first into a wall 2 feet away. It bounced off and rested, nothing missing, everything working, main and feathering shafts bent, and later discovered a plastic tail belt pulley cracked in half, and a blade cracked at the root. For the speed I sure am glad nothing else happened. It's about 25f out with slight wind, battery was keeping the heli up for a very long time and so I continued flying after I was loosing comfort in the freezing air, my fingers and brain started to numb, lol. Battery alarm still hadn't kicked in, it's all the batteries fault.

Had nothing to do with rpm, the 11.1v version seemed very slowish compared to 15v but pulled just fine. I'm feeling a bit bad today also due to smoking a couple of cigarettes at a buds place a few days ago. I don't smoke so it affected me, the nicotine, and I mean CIGARETTES, not the evil weed ganja mon.

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03-22-2015 09:42 PM  3 years agoPost 8
HeliHov

rrNovice

NorthEast USA

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I think it's a dumb idea and you do a lot of useless babbling.

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03-23-2015 03:56 PM  3 years agoPost 9
icanfly

rrElite Veteran

ontario

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I think it's a dumb idea and you do a lot of useless babbling.
wasting time behind the comp waiting for winter to fugere, french for "get lost". No worries, there's a few things in development which are reaching their final stages, high rpm was not something I cared for at first but grew a liking to a year ago. Maybe it's a waste of precious time to think everyone should give a crap, I held back from stating my new found excitement until all the testing was done.

Apparently, due to discovering this calculator yesterday, http://dhrc.rchomepage.com/calc.htm I played with the numbers to come up with a tip speed of 355mph and a top speed of 106mph with 100% throttle on 4s fully charged. I'm certain it can go faster but by how much remains to be tested.

I took a look at going with 3m blade clamp bolts, on now as originals were 2m, and need only a custom hub to upgrade to a 5mm main shaft. Sometimes you loose in weight in order to gain elsewhere like RELIABILITY. metal fatigue and all that shebang to consider.

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03-23-2015 05:15 PM  3 years agoPost 10
Aaron29

rrProfessor

USA

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Blade grips are subject to metal fatigue I would run them at their spec rpm to avoid nasty surprises.

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03-23-2015 09:08 PM  3 years agoPost 11
icanfly

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ontario

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that's odd, the 300 stock rpm is upward of 4000+ rpm. Alas, here's an example why limits get pushed,

Watch at YouTube

at the same time I took a look back at some vids of last year in the back yard and park and the 300's hs was over 4000 all the time, and on 1800mah it ran for 8 minutes, that was when it had the 5370kv minipunch car mot down at 76% max throttle, no wonder it went so fast, a chart says it could have flown at 125mph at full 3s charge and 100% throttle with 6600rpm hs, SICK. Blades I'm experimenting with are low and high rpm conducive, my grip bolts now 3m, no one makes a bearing with 2.5 centers though so up-sizing the tail grips cannot be done.

I have a 4280kva for a 450 since it got pulled from my 300 in exchange for the 3500kva LH. Never know if it'll go back to the Minipunch car motor at 5370kva putting the all out rpm about 5k+ on 3s, 3500kva on 4s is pretty much identical in end result. 100+mph top speed.

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03-25-2015 01:18 AM  3 years agoPost 12
HeimD

rrVeteran

the great southwest

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Meh, I have two helis that come with the governor set for 5000 RPM in idle-up 2 out of the box. Blade 180CFX helis.

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03-25-2015 03:01 AM  3 years agoPost 13
icanfly

rrElite Veteran

ontario

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after crunching more numbers on the options the 4380kva on 4s is the winner in the race to 150mph, with a tip speed of nearly 500mph (491mph) and a rotor rpm of 5887. This is at 80% efficiency, if I push it to 90% efficiency the #s go to 553mph tip speed, 166mph fff speed, rotor of 6623rpm. The two numbers of 553mph tip and 166mph ff make a combined tip speed on the advancing side of 719 aka, SUPERSONIC, then it would go smack,,,,,,,,,,,,,,,,,,,,,unless,,,,,,,,,,,,,,,???????????

it may be worth the jolt to try. Now what if the heli was at 100% efficiency? very scary thought.

Just to be a jerk I threw in some 1400mm rotor span numbers at 44.4v into a 900kva mot and at 90% efficiency. Th tip speed was supersonic at 669.6mph, the ff was 200.9mph, the rotor was 4082rpm.

I'm gathering all this speculative number game is at 12*max cyclic pitch, but I could be wrong.

SO THERE,,,,,,,,,,,,,,

Pay attention.

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