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11-20-2006 01:13 PM  11 years agoPost 1
Stebbo

rrNovice

St Albans UK

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Hi All,

Does anybody know the gear ratio on a standard Falcon V2 ?

I need it to calculate my CSM Revlock target speed. The eventual aim is to have a steady low headspeed on the falcon when its fitted into a Hughes 500 fuselage. This will all depend on if Santa (ie the wife)thinks I've been a good boy this year !

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11-20-2006 01:47 PM  11 years agoPost 2
SteveH

rrProfessor

Texas

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9.065934

The government cannot give you anything without first taking it from someone else.

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11-20-2006 05:42 PM  11 years agoPost 3
jackheli

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Vancouver - Canada

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Check my gallery. There is a Century gear ratio spreadsheet for download.

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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11-20-2006 06:01 PM  11 years agoPost 4
Sea King

rrApprentice

England UK

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Check my gallery. There is a Century gear ratio spreadsheet for download.
Excellent Gallery
Many thanks for taking the time to upload all the various setups

Roger

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11-20-2006 06:33 PM  11 years agoPost 5
jackheli

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Vancouver - Canada

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You are most welcome.

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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11-21-2006 07:56 AM  11 years agoPost 6
Stebbo

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St Albans UK

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Thanks All for the very helpfull information.

Stebbo.

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11-21-2006 09:18 AM  11 years agoPost 7
Colin Mill

rrVeteran

England

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Hi Stebbo

My only concern is that you want to run a low headspeed and from your email to us I know you are using a 50 hyper in this model. The hyper really likes to rev and many people have difficulty getting the hyper to run happily much below 17,000 especially on a tuned exhaust.

Best regards

Colin (CSM)

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11-22-2006 08:02 AM  11 years agoPost 8
Stebbo

rrNovice

St Albans UK

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It looks like my best option would be to go with a Revlock 20 to keep my headspeed steady and change the pinion gear in my falcon to the smaller 13T type to reduce the headspeed.

Thanks for all the advice.

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11-22-2006 08:17 AM  11 years agoPost 9
Colin Mill

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England

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Hi Stebbo

The RL20 does give you the option of changing the mix of terms in the control loop. As a general rule reducing the integral term relative to the proportional term makes the system more tolerant while increasing the integral term makes the rpm hold more accurate.

Anyway, please let me know how it goes.

Colin

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11-22-2006 09:52 AM  11 years agoPost 10
Gearhead

rrMaster

Vt

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if you go with the 13 tooth gear your motor will be screaming,, don't do it !!,,

I to like to use a lower head speed in normal mode for flying and hovering around slower,,, but you didn't say what muffler /pipe or fuel percentage your using !!,,, ??

I ran a Weston tuned pipe for almost 4 years on my OS 50s and I had no problems running a head speed of 1700, now I have a MP2 and I have no problem with it ether,, what's the trick ?,,

the trick is your fuel's nitro percentage, if you run 30% your motor is more apt to want to run at higher RPMs and come-up on-the-pipe and stay on it, but with 20% it should not do this,,,

(as Colin said) I too keep reading how guys say the Hyper 50 /MP2 like's a high motor RPM, OK you will get more power at higher RPMs, and with 30% it will want to run at higher RPMs, but it will run good at lower RPMs if a lower nitro percentage is used, after-all the MP2 is a tuned muffler not a tuned pipe,, I have run my Hyper 50 /MP2 burning 20% with a head speed of 1700 to over 2000 (that's a motor RPM from 15000 to 18000), yes I had more power with a higher motor/head speed but my motor ran just as smooth with a head speed of 1700 "burning the 20% nitro",,

how do I know my head speed numbers above are correct~ I have a Multigov, set you heli's gear ratio and set the head speed you want and that's it..

motor /head numbers with the gray gear (ratio 8.736),,

motor RPM 15000, head 1717,

motor RPM 15290, head 1750,

motor RPM 16000, head 1837,

motor RPM 17000, head 1946,,

I have found with my combo (Hyper 50 /MP2 /20% nitro, ratio 8.736) in normal mode with a head speed of 1750 I still get a good throttle response yet my motor is not screaming,, (with the governor idle-up 1 1850, idle-up 2 1900)

Jim

Jim
Buzz Buzz Buzz

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11-22-2006 07:01 PM  11 years agoPost 11
Sea King

rrApprentice

England UK

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LOL Jim
From Stebbo's post's I get the impression that he's looking to get a headspeed of around 1500 - 1550 which is more in keeping with the scale look that he's going for
The eventual aim is to have a steady low headspeed on the falcon when its fitted into a Hughes 500 fuselage

Roger

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11-22-2006 07:02 PM  11 years agoPost 12
jackheli

rrProfessor

Vancouver - Canada

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Yep, 1500 is the sweet spot on my Agusta 46.

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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11-22-2006 10:10 PM  11 years agoPost 13
Gearhead

rrMaster

Vt

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I didn't think he wanted to go that low
numbers with stock gears (9.065),,

motor RPM at 14000, head speed 1544

motor RPM at 15000, head speed 1654..

1500 with a 2 blade head, shoo, he better stay a head of it..

Jim

Jim
Buzz Buzz Buzz

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11-23-2006 12:30 AM  11 years agoPost 14
oldfart

rrProfessor

Vancouver, Canada

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Actually, they fly very nicely at 1500 - I have a mode in my Bell 47 to fly at a low 1350 on stock 9/1 gearing. Takes a different throttle and pitch curve because, at that head speed, it takes a lot more pitch to hover and climb etc. It also takes different settings of the idle/hover needle screw settings and main needle serttings as at the lower revs of the motor the fuel draw profile is also very different.

But it sure mellows it all out, and makes it very easy to fly in a scale-like manner and increaseds the fuel economy a lot. And it will not get down there unless you use soft dampers, otherwise one may get some "nodding".

At 1350, your motor is only turning at about 12K. So it is not near its power band. But in scale you are not pulling any high G maneuvers so on my 8.4 pound G-47, that is powered by the OS46FXH, there is still more then enough power for the scale type of flying I do with it.

Of course in idle up 2, the throttle/pitch curves are set to crank it up to 1750 just to do some aerobatics.

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11-23-2006 12:54 AM  11 years agoPost 15
SteveH

rrProfessor

Texas

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Of course in idle up 2, the throttle/pitch curves are set to crank it up to 1750 just to do some aerobatics.
AEROBATICS!!!! Everyone knows scalers won't do aerobatics!

The government cannot give you anything without first taking it from someone else.

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11-23-2006 07:12 AM  11 years agoPost 16
Gearhead

rrMaster

Vt

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OK, here are the numbers with the Hawk's stock 9,763 gear ratio, with the 13 tooth drive pinion

motor RPM 14000, head 1433

motor RPM 13000, head 1331

motor RPM 12500, head 1280

motor RPM 12000, head 1229

so I guess with these type's of numbers above the motor really wouldn't be screaming as I thought, it may just be worth a try..

((((9.065) motor RPM 12000, head 1323)))

Jim

Jim
Buzz Buzz Buzz

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11-23-2006 01:43 PM  11 years agoPost 17
Stebbo

rrNovice

St Albans UK

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Thanks for all your comments.

I'm using a Zimmerman 50 size muffler with 15% wilcat fuel and just looking for quiet set-up. I'm trying to avoid the "angry bee" noise I get with my Hawk SE / OS32 set up. So I thought a slower headspeed on the Falcon OS50 Hyper would be the way to go. I have no specific headspeed I'm after just a steady relaxed kind of flying.

Stebbo.

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