RunRyder RC
 3  Topic Subscribe
WATCH
 1 page 654 views
HelicopterAudacity Models P6 Pantera - Tiger 50 › Tiger headspeed too high
01-28-2007 04:21 PM  10 years agoPost 1
LcyRace

rrNovice

Winston-Salem, NC

My Posts: All  Forum  Topic

Finally got my Tiger back together. OS50 Hyper, 600mm frp blades, CY Muscle Pipe 2, Coolpower 30%. In order to not overspeed the head I can only run 75% throttle at 13° of pitch and it hovers at 35% throttle at 5° of pitch. I have verified that in the radio, 50% throttle on the curve is actually 50% on the carb. Is this typical of this bird with 600's and the Hyper motor?

When in doubt, gas it!

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
01-28-2007 04:31 PM  10 years agoPost 2
Walleye

rrApprentice

Washington, PA

My Posts: All  Forum  Topic

[url=http://curtisyoungblood.com/products_view.php?id=17]

And never look back :-) although it is good to understand throttle curve in case a gov goes out... and simply because its part of flying... but overall... spend the $95.00.

PM  EMAIL  GALLERY  Attn:RR  Quote
01-28-2007 04:52 PM  10 years agoPost 3
leroy2

rrApprentice

Vacaville Ca

My Posts: All  Forum  Topic

When I first started with the Tiger I used a stock muffler. When I switched out to a tuned pipe My RPM's increased dramatically, making it necessary to adjust the throtal curves for the increased power. Now I've added added a GV-1 and That has made all the difference in my flying.I don't have a clue where that puts the carb barrel.Just know the head speed is where I want it to be

Leo

Tiger 50 SWE 600 blades , Pantera SWE 620 blades, T-Rex os hyper, Let the fun begin

PM  EMAIL  Attn:RR  Quote
01-28-2007 04:52 PM  10 years agoPost 4
LcyRace

rrNovice

Winston-Salem, NC

My Posts: All  Forum  Topic

Yes, I understand that a gov would take care of the issue but you didn't answer my question....

When in doubt, gas it!

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
01-28-2007 10:44 PM  10 years agoPost 5
The Dude II

rrVeteran

IN - USA

My Posts: All  Forum  Topic

LcyRace,
Keep in mind that your Throttle curve 35 and 75 on your setup (servo, linkage & radio ATV & Subtrim) my equal my 48 (hover) and 100(+11).

I too CY30%
600mm vBlades
OS.50 Hyper with Audacity Pro Muffler
Bird balanced with extra weight in the nose...So she's a bit heavy

9ZwcII
My Throttle ATV is +70 & -74 (on s9252)for all flight modes.

Let's compare tic marks on our OS.50 Hyper carbs:
Tic marks on my OS 50 Hyper Carb are as follows:
1 at throttle cut
3 at 1/2 throttle range (marks of our immediate interest)
1 at full throttle

At a hover:

Normal
48 = middle tic of the 3 grouped together (1700 RPM)

Idle 1
52 = middle tic closet to full throttle (1900 RPM)

I have my TC endpoints set that I hit 100 as I hit +/- 11

I run mainly with my GV-1 and my TCs are dead-nut on
When practicing Autos...I disarm the GV-1 on the 8th channel...so I can get full power immediately in the event I need to bail-out...GV-1 has a preset "spool-up" which is nice on the ground but provides unwanted "pucker factor" during an aborted auto.

As I've been guilty-of on setup...you may need to change the length of your linkage on the throttle...such that at 1/2 throttle you are on the middle tic on the carb and the servo arm & carb arm and linkage make 90-degree angles to one-another.
Also, check your sub-trim.

I started 4 years ago with helis...and my largest mistake early on was not buying a governor...there's too much to the flight learning curve to have to monkey with the head RPM while trying to learn the ins & outs of rotary flight.

Good Luck & I hope I got your question answered.

The Dude II

lotta ins, lotta outs

PM  EMAIL  GALLERY  Attn:RR  Quote
01-29-2007 02:07 AM  10 years agoPost 6
LcyRace

rrNovice

Winston-Salem, NC

My Posts: All  Forum  Topic

Thanks Dude, great reply. Here are the stats on my setup.

DX7
atv +100/-87 for idle

At hover my carb is below the tic closest to the closed position by about 1mm. At this point I am at about 30% throttle but at 60% on the curve. This gives about 1950rpm.

At full throttle/collective (12°) the carb is about 1/3 between the tic closest to open and wide open. At this point I am at 72% throttle but at 100% on the curve. I have around 1900rpm.

I flew it again today and it seems fine with the headspeed but the cylics are a bit slow. I have the stock paddles with no weights. I guess a set of better 3d paddles will help that.

Guess I could get some 620's to slow it down or put my gov on it but I was saving the gov for my Bergen Gasser. Might just have to break down and buy another one....

When in doubt, gas it!

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
01-29-2007 10:49 AM  10 years agoPost 7
The Dude II

rrVeteran

IN - USA

My Posts: All  Forum  Topic

LcyRace,
Sounds like your engine is just a monster if those RPMs are actual.

Get a gov...You’ll be happier and you won't have to worry about over-speeding...plus it adds some safety...spin it too fast and something might fail!

As far as your cyclic is concerned...she can be tweaked quite a bit.

First, the stock paddles & long flybar are nice and stable for beginners but not for 3D...at one point in time...if you registered the Tiger with JB...he would have sent you a shorter flybar (3D) and a set of white paddles and these will open up the cyclic quite a bit. I personally like the vPaddles from vBlades...there's only one size for 3mm flybars.

Next, how old is your Tiger? The original (help me here JB with the time line) shipped with a 5mm spindle-shaft. There is an optional 3D Grip upgrade to the Tiger to take it to 6mm spindle, harder dampers, beefier grips and a leading edge control input to the grip vs. trailing edge.
I believe the Tiger 50 MKII may come with these???(Help me again JB)

Another location to tweak is your swashplate...add the 3D swash ball kit. I recall that the Tiger 50 came with a set of shorter extensions that you may still have...these will help it along.

Finally, make sure your cyclic servo inputs take the linkage just to binding and then back off just a few points on the throws. (And how fast/strong are your servos?)

Here...in Audacity's words...the addendum:

http://www.audacitymodels.com/T50ma...um-v2_2-web.pdf

Good luck

The Dude II

lotta ins, lotta outs

PM  EMAIL  GALLERY  Attn:RR  Quote
01-29-2007 12:22 PM  10 years agoPost 8
ProModeler

rrElite Veteran

Sanford, FL (Orlando area)

My Posts: All  Forum  Topic

If you want to not use the governor, then take advantage of the fact you don't need wide open throttle with full collective to mix in throttle to cyclic. This speeds things up smartly. Furthermore, the advice given by The Dude II is right on otherwise vis-a-vis the swashball kit. Personally, I like the green paddles from Thunder Tiger, the V-Blade paddles, and our own 3D paddles with 1/8" trimmed off the leading edge per the addendum (if you fly in gusty wind).

My 2¢


John Beech
AMA # 47381
IRCHA #745

PM  EMAIL  Attn:RR  Quote
01-29-2007 07:29 PM  10 years agoPost 9
Zaneman007

rrElite Veteran

Texas - USA

My Posts: All  Forum  Topic

Is this typical of this bird with 600's and the Hyper motor?
Yep, Although I am not familiar with the gear ratio on the Tiger. The OS Hyper is a monster. You have to love it.

I have a raptor 50 with 600's and an 8.5:1 gear ratio. I was hovering at 43% with a head speed around 1950, and at 85% throttle with 10 degrees of pitch it was climbing out fast. AND, and I was constantly over speeding.

Lesson learned, it is difficult to match the throttle with the pitch so that it will never over speed. Situations vary, going to full collective from a fall verses going to full collective from fast forward flight will initially produce two separate head speeds.

Solution: Get a governor.

Old Guys Rule!

PM  EMAIL  GALLERY  Attn:RR  Quote
01-30-2007 02:39 AM  10 years agoPost 10
billm

rrElite Veteran

Liberty Lake, WA

My Posts: All  Forum  Topic

All of the information above looks great.
One question that I would ask is. "how do you know your in a overspeed condition?"
I thought for several months that my head speed was scarry fast.
My ears and eyes told me the head is going way to fast on the Tiger.
One of my flying buddies showed up with a sky tac. I was only turning 1850! O goodie I still had another some more to go to hit my target speed.
Now the sky tac is telling me 2000 on the nose and I can hear the rev max kick in per the book when I get carried away.

My name is Billm. Cough, and I'm a Heli Holic

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 654 views
HelicopterAudacity Models P6 Pantera - Tiger 50 › Tiger headspeed too high
 Print TOPIC  Make Suggestion 

 3  Topic Subscribe

Wednesday, December 13 - 10:46 pm - Copyright © 2000-2017 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online