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Helicopter
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Align
Other › Actual Headspeed - Not Theoretical
11-22-2006 12:36 PM  11 years agoPost 1
v58 fuy

rrVeteran

UK - Kent

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Guys,

I have a very common setup i.e. 450SE, Align 430L motor & 35A ESC, FP2150 lipo, 325mm PRO blades, HS65's and Futaba mini PCM, +10/-10 pitch and 6deg cyclic alround.

I am currently running the 11T pinion and can honestly say that with simple aerobatics (not 3D) my battery, motor and esc really don't get warm to the touch at all, almost kind of ambient.

The theoretical calculated head speed of this setup assuming 85% motor effeciency is between 2450 & 2650 depending whether you use 11V or 12V as the basis for lipo voltage.

Now my question is how close in reality are my calculated headspeed to actual headspeeds you guys get with the same setup as mine (my tacho won't go high enough). And what sort of headspeed do you really need to make the little T-rex lock-in?

David

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11-22-2006 12:52 PM  11 years agoPost 2
RC MICHAEL

rrApprentice

Perth, Australia

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i run a hacker motor and cc45, i'm getting with my tach 3000rpm at 80% in gov mode. I used the readyheli headspeed calculator and it come out as 2831 so a little out but not that much.

Synergy N9, T-Rex 600CF, 2x T-Rex 450SE's

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11-22-2006 01:46 PM  11 years agoPost 3
Raptor Rulezzz

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Rockanje, Zuid-Holland - The Netherlands

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Now my question is how close in reality are my calculated headspeed to actual headspeeds you guys get with the same setup as mine (my tacho won't go high enough). And what sort of headspeed do you really need to make the little T-rex lock-in?
You are right on the money! Mine did in betweeen 2400/2600 when running a 100% curve on the 11t pinion. I changed to the 13t and it's around and over 3000rpm... can't measure it.

For normal sports flying 100% throttle on the 11t pinion is great, but I prefer the 13t pinion and 100%. I do drain my battery in 5 minutes though, so go figure...

Cheers,

Richard



Proud Member of Team QuickUK, Team Duralite & Sponsored by V-blades & 4rc.nl

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11-22-2006 02:42 PM  11 years agoPost 4
Jon the Rooster

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Johns Island, Charleston, SC

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(my tacho won't go high enough)
Reduce the RPM to Half on Tach.
3000 rpm would read 1500 or 2800 rpm would be 1400.

and one more thing "DON'T BE AFRAID!"

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11-22-2006 03:45 PM  11 years agoPost 5
Raptor Rulezzz

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Rockanje, Zuid-Holland - The Netherlands

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I've got the MA tach, can't do that...

I need the never version, a friend of mine brought one with him when I tached my T-rex running the 11t pinion.

Cheers,

Richard



Proud Member of Team QuickUK, Team Duralite & Sponsored by V-blades & 4rc.nl

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11-22-2006 04:39 PM  11 years agoPost 6
marc8090

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Long Island, N.Y.

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The MA tach sure can be used that way. The blades will appear stopped at half the actual headspeed. For most T-Rex's flying around about 3000 the MA tach will certainly go to 1500, that's where it is when it turns on.

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11-22-2006 05:43 PM  11 years agoPost 7
v58 fuy

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UK - Kent

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Ok, so if 100% on my 11T pinion is about 2400/2600 but I find in comparison to my Raptor/Hyper50 the climbout is not exactly startling, but running the 13T pinion will give 3000+ and short flight times - is there a compromise?

My thoughts are:

1) 13T pinion but back the throttle % down - how much and what effect will this have?
2) 12T pinion with 100% throttle?

Your thoughts welcomed.

David

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11-22-2006 11:06 PM  11 years agoPost 8
flyride

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Salt Lake City UT

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I run 13t and 100% across the board and it works great

and the blonde said "RECTUM, Hell damn near killed em!!"

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11-22-2006 11:47 PM  11 years agoPost 9
v58 fuy

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UK - Kent

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I appreciate that the 13T pinion at 100% throttle will give 3000+ headspeed, but don't do 3D so I think the 3000+ plus short flight times are unacceptable - but I don't think the t-rex has enough 'go' on the 11T at 100% throttle. So should I run 13T with reduced throttle or run a 12T at full throttle???

David

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11-23-2006 12:03 AM  11 years agoPost 10
BikeNBoatN

rrVeteran

Santa Ana, CA USA

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Ikarus makes a steel 12T in 3.2mm size that will work with a TRex main gear. Align only makes them out of brass with 11T, 13T and 15T in that size.

Brent
Slow and Smooth 2-D Scale Flyer
AMA #35431

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11-23-2006 03:44 AM  11 years agoPost 11
flyride

rrKey Veteran

Salt Lake City UT

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I get about 10 min on my battery (2100 mah align and DN batterys)if I am not in idle1 with the hover at about 75% (tachs at about 2600)wich is good for just flying norman ff and hovering (and has good climb out) if you want to do loops and rolls etc I would boost the % up alittle just try it out and see what feels good to you.I like the 13t and my battery and motor dont get to warm on this setup either.Then if you start to try 3D than you wont have to change the gear, all you will have to do is up your throttle curve to 100%.Now I am running 0,25,50,75,100 in normal and 100% across the board in idle1 and I run -10 +10 on pitch wich puts my hover at about 75%.

and the blonde said "RECTUM, Hell damn near killed em!!"

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11-23-2006 09:21 AM  11 years agoPost 12
v58 fuy

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UK - Kent

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I always fly in idle up (only use normal for spool up) my idle up pitch is -5,-5,0,5,10 (as I dont really need full -10 at present)with this I have my throttle at 97.5, 97.5, 95, 97.5, 100.

If I switch to the 13T pinion but dont want 3000+ headspeed (just want to practise my loops and rolls ect) what sort of throttle curve or percentage should I run??

David

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11-23-2006 05:57 PM  11 years agoPost 13
flyride

rrKey Veteran

Salt Lake City UT

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I did run mine at 100,85,75,85,100 in idle1 and I had plenty for loops etc( in a loop you should not have to go in to the 100% stick position but it is nice to have incase you need it).you could try this and see how it feels and just up them or lower them to your preferrence.I think this is the only way for you to know what works for you but it is a good starting point.Hope it helps

and the blonde said "RECTUM, Hell damn near killed em!!"

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11-23-2006 10:22 PM  11 years agoPost 14
NQNA

rrElite Veteran

USA

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Main Blades will make a big difference in the actual RPM you get.

3S TP 2070
Medusa 28-32-3400
12t pinion

Align Carbons 315 3000 RPM
VBlade 325 2900 RPM
Hyperions 325 3180 RPM

These are actual RPMS on the Same Day with the same Heli and Battery

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