RunRyder RC
WATCH
 1 page 815 views POST REPLY
HomeAircraftHelicopter
e-
Align
Other › Head Speed and Pitch Curve Question
10-27-2006 02:35 PM  12 years agoPost 1
kcass518

rrVeteran

Port Washington, NY - USA

My Posts: All  Forum  Topic

How do most of you check your head speed and pitch curve. Does everyone have an optical tach and a pitch guage, or do you just go by the curves in the radio? If I need these things, which ones are best?

PM  EMAIL  GALLERY  Attn:RR  Quote
10-27-2006 03:08 PM  12 years agoPost 2
catfight

rrKey Veteran

USA

My Posts: All  Forum  Topic

kcass,

You definitely need (in my opinion) a pitch gauge. I got mine from Readyheli.com and it is called the Universal Pitch Gauge. The best tachometer (I think) is the Eagletree Systems Datalogger. You mount in the heli and it reads using either a magnetic sensor (preferred)or optical sensor- does lots of other things you would really like too -check out their website about $80 for the whole thing. I had a Skytach for a while but the onboard Eagletree does much more and keeps a record on your PC if you like- nice graphing too.

What goes up must come around

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
10-27-2006 05:35 PM  12 years agoPost 3
kcass518

rrVeteran

Port Washington, NY - USA

My Posts: All  Forum  Topic

Thank, catfight! I can't tell from the photo at readyheli, is this gauge small for the mini helis, or is it normal size? I have a gauge already for my Raptor, but haven't tried it on the Trex thinking it would be too big.

PM  EMAIL  GALLERY  Attn:RR  Quote
10-27-2006 05:58 PM  12 years agoPost 4
Zaneman007

rrElite Veteran

Texas - USA

My Posts: All  Forum  Topic

Don't know how you would check the pitch and head speed without a pitch gauge and optical tach. There are a handfull of guys who can estimate headspeed by the sound.

PM  EMAIL  GALLERY  Attn:RR  Quote
10-27-2006 06:06 PM  12 years agoPost 5
catfight

rrKey Veteran

USA

My Posts: All  Forum  Topic

kcass,

I would bet the Raptor gauge would fit- but I don't have a Raptor

What goes up must come around

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
10-27-2006 06:15 PM  12 years agoPost 6
kcass518

rrVeteran

Port Washington, NY - USA

My Posts: All  Forum  Topic

Yeah, zaneman, that's what I thought. I think the guys at the LHS do it by sight, zeroing at mid stick and going from there, but they have a lot of Trex experience and can get close enough to make things work well. For me, I have nothing to compare the pitch and rotor speed to, so before I do any damage I want to be sure I'm within the right limits. A lot of posts here refer to specific head speeds and pitch curves and I didn't know if there was some other way of getting that info that I wasn't aware of - I thought electric motors might have some other way of determining rpms.

catfight - my pitch gauge is not from Raptor, it's just a standard one, but the blades on the Raptor are considerably bigger, so I didn't know if it would work. I'll try it when I get home just for fun!

PM  EMAIL  GALLERY  Attn:RR  Quote
10-27-2006 08:47 PM  12 years agoPost 7
AlanR8

rrKey Veteran

Saddleworth near Manchester (UK)

My Posts: All  Forum  Topic

You don't need a pitch gauge.

Accepting + - 10 degrees, just set the 50% stick position at 0 degrees. Get that right then in normal mode set your BOTTOM pitch to 25% to give -5 degrees.

This will suit an experienced flier. I'm sure you mathematicians out there can do the sums to work out what the bottom pitch position should be to give say -5 to -2.

PM  EMAIL  Attn:RR  Quote
10-28-2006 01:30 AM  12 years agoPost 8
Surri

rrNovice

Nidwalden, Switzerland

My Posts: All  Forum  Topic

Absolutely....
AlanR8 is correct. Don't need a pitch gauge and rotor speed is predictable based on pinion used. You for sure can support the industry, but better have a nice drink with your love one...

Cheers - Surri

PM  EMAIL  GALLERY  Attn:RR  Quote
10-28-2006 01:48 AM  12 years agoPost 9
catfight

rrKey Veteran

USA

My Posts: All  Forum  Topic

My loved one doesn't drink - think I will keep the pitch gaugeand the alcohol!

What goes up must come around

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
10-28-2006 01:46 PM  12 years agoPost 10
kcass518

rrVeteran

Port Washington, NY - USA

My Posts: All  Forum  Topic

My pitch gauge doesn't fit. It's a JR Propo Universal Pitch Gauge, but the slot is too wide to work on the Trex blades. One reason I'm curious about the pitch is that I've seen posts talking about +-10, and +-11, but maybe I'm trying to slice it too thin. I hadn't heard about changing the rotor speed with the pinion. I thought the throttle curve was supposed to do that, and reading posts showing head speeds of between 2500 and 3300 rpms, and the accompanying damage that can be caused by too high a head speed for the blades, etc, makes me wonder what my head speed is. I'm using the 13T pinion and running my throttle curve at 100 90 80 90 100, but I can't imagine my head speed is at 3300. I'll try to check it this weekend with a friend's tach, if we don't get blown away (weather is nasty today).

Thanks for all the input.

PM  EMAIL  GALLERY  Attn:RR  Quote
10-28-2006 02:35 PM  12 years agoPost 11
catfight

rrKey Veteran

USA

My Posts: All  Forum  Topic

kcass,

I spent $20 on this one - I can't judge 1 degree without one:

http://www.readyheli.com/Universal_.../pitchguage.htm

What goes up must come around

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
10-28-2006 02:55 PM  12 years agoPost 12
swattley

rrVeteran

West Milford NJ

My Posts: All  Forum  Topic

anyone that tells says you do not need a pitch guage does not know how to properly set up a heli. they do not cost anything? i even track my blades using the pitch guage then eye it up and it is so close to perfect it only takes seconds to track. using the guage i know both blades are exactly at 0 at mid stick. as far as the tach an optical tach is nice to have but not needed if someone in the club has one. i like having mine because i can see what another heli at the field is flying at while he is hovering.

PM  EMAIL  GALLERY  Attn:RR  Quote
10-28-2006 03:35 PM  12 years agoPost 13
kcass518

rrVeteran

Port Washington, NY - USA

My Posts: All  Forum  Topic

Thank you both for your comments. You answered my question. I started wondering if 1 degree was meaningful. I'm very precise on my Raptor, but wasn't sure of the need on the Trex. Of course, it is a very precise machine, and so quick that I'm sure it will benefit from greater care.

PM  EMAIL  GALLERY  Attn:RR  Quote
10-28-2006 03:48 PM  12 years agoPost 14
AlanR8

rrKey Veteran

Saddleworth near Manchester (UK)

My Posts: All  Forum  Topic

swattley commented
anyone that tells says you do not need a pitch gauge does not know how to properly set up a heli
Interesting comment I thought.

I've been setting up helis correctly now for over eight years! I agree, a pitch gauge is useful and I possess one that fits the Raptors (50 and 90) that I've flown over the last couple of years.

It won't fit the Rex though.

So again referring to what swattley said about using the gauge to set zero at the mid stick position. If you haven't got a gauge that fits, try this.

Take both blades off
Find a ruler (metal and 6 inches is what I use)
Lay the ruler inside and across the blade holder
Adjust pitch until the ruler aligns with the flybar

Job done, perfect zero pitch at mid point WITHOUT using a pitch gauge. It doesn't really matter what top and bottom stick measure, that's set mechanically, so if you get zero right you'll probably have +-10

PM  EMAIL  Attn:RR  Quote
10-28-2006 04:14 PM  12 years agoPost 15
swattley

rrVeteran

West Milford NJ

My Posts: All  Forum  Topic

alan align has a micro heli pitch guage that is kind of cheap but does work if used carefully. i use it on my t-rex and blade cp. it is not as nice as the pitch guage for my raptor but does tell you right where the blades are.

PM  EMAIL  GALLERY  Attn:RR  Quote
10-28-2006 04:19 PM  12 years agoPost 16
AlanR8

rrKey Veteran

Saddleworth near Manchester (UK)

My Posts: All  Forum  Topic

I know......

Lots of guys out there won't have a gauge so I'm just showing how you can achieve the same result without one!

PM  EMAIL  Attn:RR  Quote
10-28-2006 05:41 PM  12 years agoPost 17
kcass518

rrVeteran

Port Washington, NY - USA

My Posts: All  Forum  Topic

AlanR8,

That's too simple! But I bet it works. And I guess that as long as that 0 is coordinated with mid-stick, and your pitch curve is a straight-line in Idle Up, the rest falls into place. Very smart.

PM  EMAIL  GALLERY  Attn:RR  Quote
10-28-2006 07:37 PM  12 years agoPost 18
caseyjholmes

rrElite Veteran

Portland, Oregon

My Posts: All  Forum  Topic

I spent $20 on this one - I can't judge 1 degree without one:

http://www.readyheli.com/Universal_.../pitchguage.htm
I've had a revolution pitch guage since I bought my first raptor a few years ago. I use this on my 600. Never realised it would work for my 450 too... But I guess it would! The blade clamp allows enough travel to grip the 450 blade. You learn something new every day

I don't mind the little gold align pitch guage for the 450 though. Seems to do the trick, but I hate getting on my knees or finding a comfy spot to get eye level with the blades to set pitch.

PM  EMAIL  GALLERY  Attn:RR  Quote
10-28-2006 08:18 PM  12 years agoPost 19
SRH990

rrKey Veteran

Birmingham, UK

My Posts: All  Forum  Topic

I've got an MA full sized pitch guage I've had for over 10 years now (it was d*mn expensive then) and bought the Align small pitch guage when I bought a Trex 600. The main advantage is repeatability, its very easy to adjust the pitch to be exactly the same everytime you set a heli up. As I fly with a -10 0 +10 pitch curve these days on almost everything (some have more -ve and +ve) I just set the pitch to 0 degrees at mid stick and work from there. Once this is done if I change blades or any components I just check the mid stick pitch and re-adjust if its not 0 degrees then I'm good to go again.

One pitfall of pitch guages is that if you don't have the flybar level or maybe the flybar is slightly bent then you could read the guage incorrectly, I'm using the flybar cradle as a reference point on my helis.

Steve -Trex 700N, Trex 600N, Raptor 550E, 450SE, Mini Titan, Logo 5003D, Beam E4

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 815 views POST REPLY
HomeAircraftHelicopter
e-
Align
Other › Head Speed and Pitch Curve Question
 Print TOPIC  Make Suggestion 

 4  Topic Subscribe

Sunday, December 16 - 9:47 pm - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

The RC discussion world needs to consolidate. RR is now one choice for that. Its software is cutting edge. It hosts on-topic advertising. Help RR increase traffic buy making suggestions, posting in RR's new areas (sites) and by spreading the word.

The RunRyder Difference

• Category system to allow Rep/Vendor postings.
• Classifieds with sold (hidden) category.
• Classifieds with separate view new.
• Answer PMs offsite via email reply.
• Member gallery photos with advanced scripting.
• Gallery photo viewer integrated into postings.
• Highly refined search with advanced back end.
• Hosts its own high end fast response servers.
• Hosts thousands of HD event coverage videos.
• Rewrote entire code base with latest technology.
• No off-topic (annoying) click bait advertising.
Login Here
 New Subscriptions 
 Buddies Online