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Got Jet Fuel? Turbine Helicopters > XLV turbine conversion
 
 
Bang68
Heliman
Location: Denmark

Hello !

I will shortly in the beginning of next year start to puy my Vario XLV Hobbyparts turbine conversion for SPH5 together and in this matter what sort of Futaba tail servo would you recommend ?

regards

Peter B
12-23-2007 01:16 AM
 
 
DKTek
Senior Heliman
Location: Melbourne, FL-USA

Futaba 9206 works awsome with the 401 gyro in normal mode, no heading hold. The 401 digi servos don't have the torque to deal with the MASS of the XLV's tail rotor. The 9206 isn't fast enough to work properly in heading hold but works great in DIR mode.

The beatings will continue until morale improves...
12-23-2007 03:29 AM
 
 
MattJen
Key Veteran
Location: UK,Gravesend, Kent

i use the 611 with the 9256, i fly in heading hold and i use the 3 bladed tail..

It holds fine,

Matt



I bought my Mother-in-law a chair for xmas, but she wouldn't plug it in
12-23-2007 01:07 PM
 
 
heliman53
Senior Heliman
Location: Huntsville, Alabama USA

We have built three XLVs witht the 611/9256 and four blade tail rotors with no problems plenty of tail authority. Craig B
12-23-2007 02:49 PM
 
 
DKTek
Senior Heliman
Location: Melbourne, FL-USA

I stand corrected. Thanks Matt and Craig. Are you guys using a tail mix with your set-ups?

The beatings will continue until morale improves...
12-23-2007 03:37 PM
 
 
MattJen
Key Veteran
Location: UK,Gravesend, Kent

Are you guys using a tail mix with your set-ups?

i fly in heading hold, with heading hold you cannot have any Revo mix in or it messes up the gyro...

In Normal mode you can,

i fly in HH so i dont use any mixes..

Matt

I bought my Mother-in-law a chair for xmas, but she wouldn't plug it in
12-23-2007 05:25 PM
 
 
Coolrunnin
Veteran
Location: Manchester U.K.

I'm running a Futaba BLS451 with a 401 in HH . Excellent performance, even with the 3-blade tail.

Recommended
12-25-2007 04:52 PM
 
 
DKTek
Senior Heliman
Location: Melbourne, FL-USA

Happy Holidays guys! Looks like I'm in the market for a new tail servo.

Dang, now I'll have two extra 9206's, tail and throttle after I do the Cat conversion...errr maybe not 'cause I want to just build up the conversion and leave the stock machine alone. I only need a tail boom and guts between the frames. I already have the three blade head and tail rotors bought for the conversion. I'm going with carbon skids instead of the stock landing gear config... My best guess is about $2 G to have a second XLV flying. One gasser and one Cat converted.

The beatings will continue until morale improves...
12-25-2007 10:32 PM
 
 
DKTek
Senior Heliman
Location: Melbourne, FL-USA

LOL, My friend just accused me of being nuts. You guys feel me right?
Am I ate up with it or what?

The beatings will continue until morale improves...
12-25-2007 10:35 PM
 
 
chopper jockey
Senior Heliman
Location: uk

Hey,
once you have the turbine running, you may not want to go back to a gasser.
12-26-2007 12:19 AM
HOMEPAGE  
 
 
DKTek
Senior Heliman
Location: Melbourne, FL-USA

You're right CJ, but the turb has to be flown on closed sets or private land . The gasser can be flown at the regular AMA field.

That "clutch requirement" crap again. The AMA has to be full of guys from the days when starting a turb required to be at ground zero. I wish they'd get with the times and let somebody on the safety board with a slight hint of new technology. The second stage is a good argument, electric helis is a good argument, etc. but bottom line is the remote start capability of most, if not all, current day turbs...

Sorry guys, as long as the AMA policy is what it is, this'll be a sore subject. You guys in the UK are lucky.

The beatings will continue until morale improves...
12-26-2007 02:37 AM
 
 
chopper jockey
Senior Heliman
Location: uk

Ah the silly AMA "clutch" ruling...
I won't get in to it too much, but the wording does not mention a clutch. I think the rule states the head must be stationary when the engine is at idle ( or words to that effect). The simplest way around that rule is do not "idle" the engine. I presume by remote starting up and going immediately to flight rpm would mean you are not breaking the rule. and when you shut down, again go from slightly above idle to fuel cut off and there you are.
Sorry to hijack the thread. And you guys have cheap petrol, so you are the lucky ones.
12-26-2007 01:06 PM
HOMEPAGE  
 
 
Bang68
Heliman
Location: Denmark

Hello all !

Thanks for the varius inputs

I will stick to analog 9206 on the swashplate and will try some digital setups on the tail because I really like HH!

How about 9206 and 6 volts !

regards

Peter B
12-26-2007 02:04 PM
 
 
human213
Senior Heliman
Location: malibu

You could run the 5955tg hitec and solve the problem...

michael

Not everything that can be counted counts, and not everything that counts can be counted.
12-31-2007 01:19 AM
 
 
Coolrunnin
Veteran
Location: Manchester U.K.

Bang - I would double check the 9206's voltage limits before trying it on 6v. From memory, I'm not sure it is rated up to 6v, like a lot of Futaba coreless analogues. One thing you don't really want is to put unnecessary strain on an XLV servo - they already have enough to do

BTW loosing the tail wouldn't be too bad. The XLV autos excellently, even in emergencies with a lot of fuel on board.
12-31-2007 01:34 AM
 
 
Richard
Veteran
Location: Scottish Borders, U.K.

The S9206 is 4.8volts only. I use S9202 at 6 volts on my Powercat.

Richard

Oh **** ! this is going to be expensive?
12-31-2007 11:48 AM
 
 
MattJen
Key Veteran
Location: UK,Gravesend, Kent

Richard

what is the torq/speed on the 9206 ?

matt

I bought my Mother-in-law a chair for xmas, but she wouldn't plug it in
12-31-2007 03:08 PM
 
 
Richard
Veteran
Location: Scottish Borders, U.K.

Hi Matt,

SPECS: Speed: .19 sec/60° @ 4.8V
Torque: 132 oz-in @ 4.8V (9.5 kg-cm @ 4.8V)




Oh **** ! this is going to be expensive?
12-31-2007 03:59 PM
 
 
Bang68
Heliman
Location: Denmark

Hello all !

My Hobbyparts conversion nearly done - nice

Concerning the headspeed control with the 3 pos switch I have some questions.

For the gear ratios in the ECU, I put in 20,76 for the turbine -> rotor and 5,93 turbine -> tail.

That is with a 14 tooth pulley on the SPH5 gearbox and a lower pulley of 83 tooth combined with a upper gear with 70 tooth and 20 tooth

So far so good, but when I try to put in R0 = 500, R1 = 650 and R2 =850 it corresponds to a way too low turbine rpm in my oppinion
-> lower than 50000 and ofcourse I cant save it because this it the minimun turbine rpm

So any suggestion how to proceed or manipulate to get the figures right

Any info preciated

Regards from Denmark

Peter Bang
02-10-2008 09:44 PM
 
 
Coolrunnin
Veteran
Location: Manchester U.K.

Peter,

Phil sent me through a set of setup tips for the gearing, suggesting that I use 19.25:1 for the main gearing ratio.

Those headspeeds also seem very low compared to what I run for the three settings with the stock 2-blade head.

I use:

R0 = 836rpm (Vario recommended headspeed for the airframe)
R1 = 875rpm
R2 = 900rpm

All these speeds work fine though I usually fly at the lowest 836rpm as this has the most scale-like handling and blade noise which I prefer.

Hope that helps,

Mike
02-10-2008 10:08 PM
 
 
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Got Jet Fuel? Turbine Helicopters > XLV turbine conversion
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