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Century Radikal E640 - Swift 16 NX
› How much RPM can the Elite CP handle?
10-19-2004 09:20 PM  13 years agoPost 1
Satoer

rrApprentice

Zaandam, the​Netherlands

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I’ve switched from Helihobby sport blades to MAH pic pro carbon blades. Great blades but the downside is that these blades are much smaller, so the speed of the heli is lame. With the helihobby sport blades it was like a rocket.

I’m running a razor 350 with a 10T pinion and a phoenix25 controller.
Pitch: about -5 +11 degrees (with the metal head)
Current rpm: 2880 rpm with no pitch and 2612 RPM full pitch.
Phoenix controller: 100% flat curve with High governor

The motor stay’s cold after 10 minutes flight. So I’m thinking to change the 10T pinion to a 11T pinion, but I’m afread the hummer cant handle the extreme RPM.

So, my question: How much RPM can the Elite CP handle?

Thanx

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10-21-2004 03:56 AM  13 years agoPost 2
Slipknot77327

rrApprentice

Conroe, Texas

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Ok,Im pretty Sure This is A Way you Can do this,

Put Some Wood Blades On it,Then Spread some epoxy around the root of the blade to keep the blade from breaking apart in mid air.
Get A Stronger motor.Maybe a Hacker B-21L(I think thats the name of it).

Get the RPM up to about 2800-3000 RPM,It will be very stable and Extremely fast.

I know you can do this with the piccolo pro,Not surw about the HB cp though

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10-21-2004 08:55 AM  13 years agoPost 3
alanhsu

rrKey Veteran

Vancouver, Canada

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I want to know the answer too.
what's a safe range?

I've heard of rpm above 3000...

But then again, heavier blade might break at headspeed of 2000+
I guess there is no correct answer

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10-22-2004 03:34 AM  13 years agoPost 4
Slipknot77327

rrApprentice

Conroe, Texas

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Hey ,Go Buy Some Stock Piccolo Pro Wood Blades,Those will work ,as those are what they used on it.

just remember,put Some 20min epoxy at the root of the blade,so that the blade root doesnt break off.

EDIT:Whoops! Made a Mistake,Your supposed to use CA,Sorry bout that. Anyway,Look at this link X-Pro Micro Heli

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10-22-2004 05:10 AM  13 years agoPost 5
Carlos2

rrVeteran

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Along with worrying about failure at the blade roots, wouldn't failure of the blade grips where they connect to the head be a concern as well?

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10-22-2004 11:38 PM  13 years agoPost 6
zoom

rrElite Veteran

Galveston, Texas

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I tach'd 3500 rpm MS 255 CF's once with no problems

Predator, Raptor 30, TRex CCPM 450TH, 3D Pro 400F

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10-22-2004 11:42 PM  13 years agoPost 7
zoom

rrElite Veteran

Galveston, Texas

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I have also used epoxy as well as CA. I never had a problem with the roots and grips even with crashing.

Predator, Raptor 30, TRex CCPM 450TH, 3D Pro 400F

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10-23-2004 03:00 AM  13 years agoPost 8
Hoverup

rrElite Veteran

Golden Gulf Coast -​USA

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The bearings in the grips separated on one of my idiotic 3200rpm experiments and shed both stock main blades. Be careful above 2800 that's the upper limit I use now.

Cheers - Boyd
AMA 80393
IRCHA 3355
LSF 853
Major USAF
Retired

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10-23-2004 04:28 PM  13 years agoPost 9
jshaw001

rrNovice

Ames, IA

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what motor pinion combination are you using to get 3000+ rpm?

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10-23-2004 04:42 PM  13 years agoPost 10
zoom

rrElite Veteran

Galveston, Texas

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Himax 2015:4100, 10T, fully charged pack TP 3s 1320 pack.

I also had Eflight 370: 5400 kv w / 10T that yielded 3300 rpm with thick like90 254mm, but It was less powerfull underload than the himax which is a 10amp motor vs. the 370:5400 's 8amp max.

Predator, Raptor 30, TRex CCPM 450TH, 3D Pro 400F

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10-23-2004 11:49 PM  13 years agoPost 11
jshaw001

rrNovice

Ames, IA

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well I did a few calculations based off of your numbers zoom now this is totaly theoretical and also assuming that my hacker has the same amount of power of your HiMax (which it probly doesn't)
I calculated that your Himax running a 10 tooth pinon would have to spin 46200 RPM to have a head speed of 3300 (140t main gear right?) my hacker has a KV of 3463 I was using a 11t pinon for a while and going off your numbers I came up with a head speed of 3,630 for mine, I dunno how close that is to reality, but I bet I was at least over 3000 I since have moved to a 10t seems to have longer run time. where was I going wiith all of this?
--Jason

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10-24-2004 01:06 AM  13 years agoPost 12
zoom

rrElite Veteran

Galveston, Texas

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I don't know much about the hackers since I have never own one, but generally you can get an idea of how much power(watts) your motor is putting out by using the following formula:

volts x amps= watts

12v x 9 amps = 108 watts w/ 10T pinion on himax

They say the himax is a 100-110 watt max motor. Now Ihave heard that the hacker are more efficient than the himax, but I think the himax is a really good buy. Now that is considering your system is 100% efficient you can you can get the above wattage. Just factor in the percentage loss and you will have your true wattage produced by your motor.

Predator, Raptor 30, TRex CCPM 450TH, 3D Pro 400F

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10-24-2004 01:23 AM  13 years agoPost 13
zoom

rrElite Veteran

Galveston, Texas

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Now for the question about the headspeed...

Himax 2015:4100kv

12v x 4100kv = 49200 rpm max at that voltage. I used 12v since we like to run 3 cell lipos which puts out 12.6v fully charged, but voltage drops shortly after you put a load on it.

140T:10T pinion =14:1 ratio

49200/14 = 3514 rpm

I have actually gotten 3500 rpm (100% throttle in idle up and at zero degrees pitch) out of my long MS 255 CF blades due to them being so aerodynamic at 3mm thickness and only weighing ~9-9.5grams. I have gotten about 2800 rpm out of my like 90 254mm woodies, but you see, the like90 had a ~4.75mm thickness and it drew more amps to push them. Long story short, your final headspeed obtained not only depends on max wattage of your motor, but it also governed by the design of your blades.

Predator, Raptor 30, TRex CCPM 450TH, 3D Pro 400F

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10-24-2004 01:23 AM  13 years agoPost 14
alanhsu

rrKey Veteran

Vancouver, Canada

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How about this, anybody ever blow up the head before.
If so what were they running?

I've never heard of a case here though.

But I've heard one where the head on a zoom blowed up after 3D flying.
I know less people use the HB CP for 3D flying so maybe that's why there is no case where the head blowed up.

Anyways, with CF blades, the only weak spot we are looking at is the blade holder that is screwed on the head. I am not sure what's the threshold of the plastic on that area. And I don't want to test it out until it breaks...haha.

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10-24-2004 01:31 AM  13 years agoPost 15
zoom

rrElite Veteran

Galveston, Texas

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For your hacker, I got:

12v X 3463kv = 41556 max rpm at that voltage

140T/11T = 12.7:1

41556 rpm / 12.7= 3272 rpm for your headspeed.

This of course not figuring in any losses as well as you may actually start out with slightly higher than 12v in your pack, but these calculations should put you in the ball park.

Predator, Raptor 30, TRex CCPM 450TH, 3D Pro 400F

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10-24-2004 01:35 AM  13 years agoPost 16
alanhsu

rrKey Veteran

Vancouver, Canada

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There are many people running 3000+ headspeed(if calculations are correct) with Hornet2 blades or other blades. I for one has this setup.
So I think that's not dangerous.

But I am thinking of running the Zoom400 blades on HB.

Its a perfect fit, weights 12 grams (compare to 9grams of a Hornet2 CF blades). Its about 2.5CM longer than hornet 2 blades.
Should perform like a dream, auto should be much easier too.
The only thing I am worrying about is my head exploding(not My head, my helicopter's head)...

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Century Radikal E640 - Swift 16 NX
› How much RPM can the Elite CP handle?
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