RunRyder - Notice any difference with tail mounted servo?

rrTV-PHOTO

New HD TV

HOME rrTV-PHOTO GALLERIES MY GALLERY HELP-FAQ

myHOME PM pmRR MEMBERS 713 ONLINE 42 EVENTS SEARCH REGISTER START HERE

2 pages [ << < ( 1 ) 2 NEXT >> ]

1468 views

POST REPLY

Advantage Hobby	.	Revolution Models	.	CarbonXtreme
	.		.

Main Discussion > Notice any difference with tail mounted servo?

helicopter34
Veteran
Location: New Jersey, exit 82

Do you think I would notice any difference with tail mounted tail rotor servo?

I have a Falcon 46. I got it used and it came with a tail servo. The guy I bought it from had a carbon pushrod made from an arrow. After a boom strike and ordering a new tail pushrod, I noticed it didn't fit in to well connecting the smaller section of the pushrod to the tail mounted servo so I just decided to put the servo in its normal spot and use both connections of the pushrod. Now I am just wondering if it would make much of a difference. I could always make a pushrod if I needed to.

02-10-2002 Over year old.

HOMEPAGE

capebob
Veteran
Location: Cape Coral, FL

You may tell the difference if you're a world class 3D pilot, but then you wouldn't have asked that question here.

The only criticism that Mike Mas had of the Sceadu in his review in Rotory Magazine was the rear mounted servo. His logic is that what possible difference could ten inches of well supported push rod make. Also, moving a servo aft moves the cg aft and that's usually not good. In my club I think I'm the only one who is out of the "newbee" stage that doesn't use a rear mounted servo. Some fly better than I do, others don't but I'm sure the placement of the rudder servo has nothing to do with that.

Oh, BTW most of them have several ounces of lead in the nose of their helicopters because of all the eye candy mounted on their tail booms.

Bob

02-10-2002 Over year old.

HOMEPAGE

Beezer
Veteran
Location: Ontario, Canada

I think the main benefit of the tail mounted servo is a more precise and more solid rudder control. The carbon fiber pushrods are very stiff and don't bend like the standard thin metal pushrods. If you have spend the money on a nice fast tail servo you might as well get all the performance out of it as you can and I think the tail mount is just the ticket.

IMHO

I just got one myself that will be going on my Ergo.

Carl

02-10-2002 Over year old.

Ken B
Elite Veteran
Location: Phoenix, AZ

Tail mountes servos explained:

In a belt drive machine some folks that live in multi-climate conditions have to adjust the belt tension of their machines. With a tail mounted servo the worry of having to readjust your servo every time you tighten or loosen your boom belt tension is gone.

Yea you can use a carbon rod, aluminium rod or steel rod to control the the tail system. I have tried them all. But for me the above reason is the best explination I can find.

Ken B

02-10-2002 Over year old.

HOMEPAGE

Raptor_in_Swede
Senior Heliman
Location: Stockholm /Sweden

Hi
My comment on that more and more new helis have the tail servo on the boom is that it is making the design of the heli simpler and not more expensive to manufacture and you can even get a sales advantage out if it.
If you just think about the complexity of routing a long pushrod from the back of the frame to the front of the frame and avoiding the drive-train parts, compared to just place the servo on the boom.
With the servo on the tailboom you can optimise the frame without any thoughts about tail pushrod routing.

Raptor 30V1/TT39H/Hatori#415/GY401_9253
Hirobo GPH GT/TT50H/Hatori #544/GY401_9254
RD8000

02-10-2002 Over year old.

d_wheel
Senior Heliman
Location: Deep in the heart of Texas.

I found absolutely no difference in the flight characteristics of the heli. What I did find was that the rear mounted servo was constantly dripping with lubrication from the exhaust. There is probably a way to divert the exhaust from ending up on the servo, but in my opinion it isn't worth the trouble. I went back to front mount.

Later;

D.W.

02-10-2002 Over year old.

Angelos
Key Veteran
Location: nr Oxford, OX11, UK

you don't have to be a WC pilot to see the difference.

Then why you use a pushrod, why you use a digital servo or a top of the range HH gyro? They all add up to a better performance.

Also a good HH gyro is wasted without a digital (or at least a very fast servo). Similarly a digital servo and your expensive gyro is wasted without a pushrod.

The pushrod impoves control resolution of the tail pitch and allows you to make the most of your gyro.

With a pushrod you should be able to use a higher gyro gain before the tail starts wagging on FFF/turns. The extra gain will be of benefit when you do 3D.

02-10-2002 Over year old.

EChapkis
Veteran
Location: Tampa, FL

tail mounted servo

My GPH had the servo on the frame. The wire to the tail had to go through some slight bends which does create friction. I moved the servo to the tail boom and made my own cf rod. The whole system is silky smooth.

I was concerned about the cg, but through a series of issues, I ended up with a GY502 gyro so the control panel was put up front and negated the cg shift.

The only heli I have seen that has the servo in the frame that oprates as silky smooth as a tail mounted one, was a Millenium, I think. It used a few bellcranks to the tail but worked very well.

Evan Chapkis Tampa, Florida

02-10-2002 Over year old.

Raptor_in_Swede
Senior Heliman
Location: Stockholm /Sweden

Hi

The GPH is just such a heli design where the tail pushrod design is a big compromise. When you look at the design one could wonder if the designers forgot that a pushrod was needed until the the bitter end.
And as the GPH as many other helis are front heavy the weight of a
servo at the front of the boom,could only be to the good.

If you want to check the CoG position, you could do it in two ways:
Lift the heli on the main gear with fingers one each side of the gear.
You will probably find that you need to hold the fingers on the main gear somewhere in front of the main mast to get the heli in balance.
The other way is to hold the heli in the blade holders and turn the heli 90 degrees so the main mast is horisontal.
Both this ways work good as the main gear and the main mast is close the GoG, both vertically and lengthwise.

If you try to check the balance by holding the heli in the paddle/stabilizer bar you will not get a good indication of the balance as the paddle bar is too high up compared to the CoG. You can have a "big" unbalance before you get any indication of it when lifting in the paddle bar.

Raptor 30V1/TT39H/Hatori#415/GY401_9253
Hirobo GPH GT/TT50H/Hatori #544/GY401_9254
RD8000

02-10-2002 Over year old.

SemiArticulate
Veteran
Location: On Location

"you will not get a good indication of the balance as the paddle bar is too high up compared to the CoG"

No. If its a mile high, gravity is still straight down. You want to lift the heli by the center of the main mast (if thats where you want the CG). It does not matter at what height of the main mast you check from. You then adjust the CG so that the mast is pointing straight up and down. The flybar method is the most convenient "no duh" way of holding onto the center of the main mast.

"You will probably find that you need to hold the fingers on the main gear somewhere in front of the main mast to get the heli in balance"

You can do that to get the heli to balance at some point other that under the main mast. But if you want to balance it at the main mast then you better stick you fingers on the gear at points parallel to center of the main mast. Or grab the flybar and forget about it.

02-10-2002 Over year old.

boyse
Heliman
Location: Thousand Oaks CA

I noticed difference w/ my R30. The tail pushrod guides were starting top wear just a little and the pushrod was making a buzzing sound, (comming from within the guides). Slop was starting to develp there.

02-11-2002 Over year old.

jjones
Senior Heliman
Location: Pendleton, Oregon

futuristics

perhaps one day we will have small 150 oz servos mounted dirctly on the tail and all wires routed through the boom for aerodynamics to get that extra edge, not to mention rounding all bolts and linkages to a slender carbon aerodynamic look like racing wheel spokes on a road bike...

I'm just joking... I have used both wires from the front and carbon rods on the tail... Learning - the little wire is cheaper and easier to fix, just bend it... Carbon is nice and stiff, but weight is negated by both... pushrods have lots of guides like the vigors, or tail mounts with extra bulkk to mount the servo, whereas up front there is usable frame space already...

JMHO, it would be hard to tell the difference, I think if all of us, me included, thought as hard about how I can get more gas for my chopper and more fly time, compared to which minor upgrade would be better, we would all make leaps and bounds of improvement...

02-11-2002 Over year old.

HOMEPAGE

hoh
Heliman
Location: Viva Las Vegas

There is a Sucker born every minute.. The Heli manufatures need these people...
If you think you fly better because the Rudder servo location, digital servo, carbon pushrod. You are one of those suckers. You fly better because you pratice.

02-12-2002 Over year old.

HOMEPAGE

Michael_Fath
Senior Heliman
Location: Chugiak, AK

My opinion is that a tail mounted servo could make life easier for the tail servo. Reduced stiction from eliminating the rod guides and reduced inertia from reducing the pushrod mass mean that the servo has to do less work to do its job. When I get a Sceadu, it will be my first tail monted servo. Maybe my tail will hold at a very slightly higher backward speed. I don't expect to "feel" a difference. But, my 9253 might be a little happier. The c.g. issue is a bummer though.

Good luck,
Mike

02-12-2002 Over year old.

ed vega
Key Veteran
Location: nyc, queens

how direct is the tail control pitch rod?, and how much slop exists between the servo and the linkage movement?. including the pitch plate and slider parts?

02-12-2002 Over year old.

Beezer
Veteran
Location: Ontario, Canada

You still using pushrod guides SENECA?

Why didn't you opt for the CF pushrod and do away with the guides?

Carl

02-13-2002 Over year old.

Beezer
Veteran
Location: Ontario, Canada

12 Helis ? Wow

Ahhh. Ok.. Was just wondering if there was a specific reason you didn't put CF pushrod on that heli yet. Lack of time is a good reason. I know what that is like.

I just ordered one of those Mr.Carbon universal pushrods from Rick's . I believe they fit everything. Just cut the carbon to required length and JB Weld the aluminum ends on.

Man I wish I had half that many helis. You must have taken quite some time to collect that many.

Carl

02-14-2002 Over year old.

HighFlier
Senior Heliman
Location: Chicago, IL.

my .02

I dont know if it really makes much difference weather the servo is mounted infront or on the boom. The reason I say this is because, take a close look at the factory rep. machines. Other then changing maybe the "WOODIES for CF blades" the rest of the machine is STOCK. If the tail servo is mounted in front and is controled with a thin wire, thats all they use, and ARE DOING ALL the HOT MOVES!!!!!!

Just something to think about.
Keep'm Fly'n
Ken

02-14-2002 Over year old.

MobileRaptor
Veteran
Location: Orange, Texas

Hay Seneca

What Are you build, here's a pic. of my current building project. Yes That's two Tables it's setting on.

02-14-2002 Over year old.

Beezer
Veteran
Location: Ontario, Canada

Nice Job

That's lookin good MobileRaptor. Wish I had the patience to put that kind of care into a project. Man that is huge too. Next project will be your own scale kit plane that you will fly yourself.

02-14-2002 Over year old.

2 pages [ << < ( 1 ) 2 NEXT >> ]

1468 views

POST REPLY

Midland Helicopters	.	HeliProz	.	ZoomsHobbies
	.		.

Main Discussion > Notice any difference with tail mounted servo?

UPDATE SCREEN PRINT TOPIC

Advertisers

Subscribe to This Topic