50 / 600 Head Speed ???

[Gareth-71]

Hi All

What would be the equivalent head speed to a 90 sized heli running 2200 to 2300?

Gareth

[sacko]

Thats pretty high for a 90, I run mine at 1950rpm..

With a 50 @ 2150rpm.

...nitro though.

[Gareth-71]

Hi

Yes, it is high, but the way that I like it! :-)

So based on what you run the math works out to 2500 .... ?

That may explain why my fusion 50 sounds a bit vibey at 3400 ! lol - great performance though!

Gareth

[J-S-Q]

Hi

Yes, it is high, but the way that I like it! :-)

So based on what you run the math works out to 2500 .... ?

That may explain why my fusion 50 sounds a bit vibey at 3400 ! lol - great performance though!

Gareth

3,400? I'm surprised it doesn't explode at that head speed. Bet the performance is pretty serious though.

[jamiem]

Just be very careful gareth, thats got to be in to blade breakup / feathering spindle failure / main shaft failure / tail hub/shaft failure territory! Personally I wouldn't run a 50 over 2300 absolute tops, preferably nearer 2150 tbh. You must be destroying the packs at that kind of speed, not to mention the esc

[raptorheli2]

3400!!! i would implore you to reconsider what your doing there. that is extremely dangerous, i can't emphasise enough how dangerous that is.

to answer your question-1950-2000 on a 90 is plenty, you won't find a 90 geared to run much more than that without blowing up your motor on a regular basis. on a 50 nitro the power is about 2100-2150.

cheers

[moyesboy]

mrw^2,mass x radius x rotation speed squared. At 2800 you have double the radial load that you have at 2000 rpm. Usually a .50 size is running under under 2200 rpm. I'd say doubling the load the head and blades are designed for is pushing it a bit. I'd avoid flyng it close!

[Gareth-71]

3400!!! i would implore you to reconsider what your doing there. that is extremely dangerous, i can't emphasise enough how dangerous that is.

to answer your question-1950-2000 on a 90 is plenty, you won't find a 90 geared to run much more than that without blowing up your motor on a regular basis. on a 50 nitro the power is about 2100-2150.

cheers

Hi

They are both electric.

2300 on the Srimok is GREAT!

The reason I am asking about the fusion is that I maidened it and the head speed sounded crazy, so auto'd and tach'd without blades.....

Gareth

[squeaky pete]

run my 50s ay around 2150 and my 90 at 1960, i think it gets to s stage where no matter how fats the headspeed is it wont make much more difference, the blade can only giv so much lift, no matter how fast its spinning

[raptorheli2]

Hi

They are both electric.

2300 on the Srimok is GREAT!

The reason I am asking about the fusion is that I maidened it and the head speed sounded crazy, so auto'd and tach'd without blades.....

Gareth

what motor, packs, pinion you running?

cheers

[millerman]

What kv motor are you running the fusion 50 1100 kv ???? Lol crazy man


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[Tim Procter]

Hi

Yes, it is high, but the way that I like it! :-)

I look forward to reading your future thread titled "My heli exploded mid flight"

[Gareth-71]

Well, I've been trying for that magic 5000 RPM, where suddenly the heli does all the flying for you, I'm just having trouble getting there.

Stock everything and 12s. I have to run the esc at 65% to get flyable headspeed, s I guess that I will get an ever so slightly smaller pinion.

Gareth

[Jamin_00]

err, yea good idea.

Until then I will tell everyone to stand well back from you when flying or just make you go fly in the other field!!!!!!

[raptorheli2]

what motor, pack, pinion?

edit this is the fusion i'm talking about as that is running 3400?

cheers