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HIROBO Turbulence - SDX - Freya - Sceadu > What servo's in 60 size Freya
 
 
burner
Heliman
Location:

My Posts This: Topic  Forum		Getting a new Freya 60 kit this week, what servo's are people running in these. Plus any build tips.
Thanks for any info,
Regards..... Burner.
06-12-2005 Over year old.
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mrNoodles
rrProfessor
Location: Borlänge, Sweden

My Posts This: Topic  Forum		9350 on pitch and 9252 on cyclic.
06-12-2005 Over year old.
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Dr Lodge
Elite Veteran
Location: Guildford, Surrey - UK

My Posts This: Topic  Forum		or even the newer 9351 on pitch, I have this and 9252s in cyclic, 9253 on throttle and GY601/9251 on the tail

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200
06-12-2005 Over year old.
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P Johnston
Senior Heliman
Location: Near the BIG HOUSE! GO BLUE

My Posts This: Topic  Forum		Why do you and other people I see run the super fast servos on the throttle? Just a question. It seems over kill to me.
06-12-2005 Over year old.
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Dr Lodge
Elite Veteran
Location: Guildford, Surrey - UK

My Posts This: Topic  Forum		better/faster reaction when using a governor that supports super servo mode...

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200
06-12-2005 Over year old.
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tadawson
Elite Veteran
Location: Lewisville, TX

My Posts This: Topic  Forum		Of course, there is that minor little detail that the engine can't respond as fast as the servo, totally negating any effect of a fast throttle servo . . . . . . . . I guess this may well fall under the heading "mental upgrade" . . . .

- Tim
06-12-2005 Over year old.
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P Johnston
Senior Heliman
Location: Near the BIG HOUSE! GO BLUE

My Posts This: Topic  Forum		Thats kinda what I thought too.
06-12-2005 Over year old.
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Blair
Key Veteran
Location: Republic of Canuckistan

My Posts This: Topic  Forum		9151 on pitch, 9252's on cyclic.

Blair
06-12-2005 Over year old.
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burner
Heliman
Location:

My Posts This: Topic  Forum		Thanks

Thanks for the help guy's.

Regards..... Burner.
06-15-2005 Over year old.
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Helinutnz
Elite Veteran
Location: below 42 South

My Posts This: Topic  Forum		why you guys always come out with the...."engine can't respond that fast"
Sorry but Crap. I am having troubles with my 9253 servo on my TJ pro. The engine is running on an MP2. I may have a calibration or mixture issue. I can see the carb arm moving rapidly back and forth during flight in the hover. Result??? the gyro senses it and kicks the tail. The engines burps and farts rapidly. Turn the TJ off and it smooths out. Not the servo's fault but it is fast and does affect the engine. by your accounts it would have no effect due to the engine being unable to respond to a rapid movement that the 9253 makes.

secondly......read the article put out by (russ deakin I think) the uk model mag and he has a good write up regarding the TJ pro and the rotor rpm holding issues surrounding super servo mode and a normal servo......result??? the high speed digital servo mode held the rpm better in all respects on the same ship with the same engine and gear.

these engines do respond fast. the pistons are travelling up and down the bore around 30000 times a min. (at 15000 rpm of course) Thats about 500 times a second. They'll respond a lot faster than an average engine.

On a governor......faster is better or gain speed by using a long arm on your slow servo (but risk inaccurate throttle response to small movements due to crap gears, loose bearings and analogue inaccurate centering being exaggerated by a long arm)

My two and a half cents worth.

Glenn
06-15-2005 Over year old.
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mrNoodles
rrProfessor
Location: Borlänge, Sweden

My Posts This: Topic  Forum		Engine reponds fast. But the question is how fast that is needed.
I mean 0.07sec is for turning 60degrees (Fut 9253 speed), and if you need 60degress more throttle than the second earlier I doubt that a fast servo will save your heli
But Im not arguing that a faster is better, but the question is how much a average flyer notice when going from 9001 (0.19s?) to 9253 (0.07s)?
06-15-2005 Over year old.
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Helinutnz
Elite Veteran
Location: below 42 South

My Posts This: Topic  Forum		gidday mrnoodles.
nothing to do with saving the heli or needing engine response in relation to stick position. Only to do with governor reaction and stable rotor speed.

Cheers
Glenn
06-16-2005 Over year old.
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Jafa
Elite Veteran
Location: Sydney, Australia

My Posts This: Topic  Forum		There is good theory behind why you don't need a really fast servo - the throttle is typically used from 40% to 100% - so it's not a full 60% swing of the servo arm - and there is a limit to how quick the engine can respond to immediate demand requests (ie slower than the time taken by the servo to open the throttle)

We have several TJPro's running 3001 and 9001 servo's - they work great

Nothin wrong with using a fast servo however

If the engine is not running really sweet then the TJ does take issue with it


Protos | Logo 400 & 500 | Sceadu Evo | Freya Evo | Trex600N | Avant FX
06-16-2005 Over year old.
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Dr Lodge
Elite Veteran
Location: Guildford, Surrey - UK

My Posts This: Topic  Forum
Quote 
there is a limit to how quick the engine can respond to immediate demand requests


Yes, about 0.005 seconds at 14,000 rpm ie one engine cycle.



Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200
06-16-2005 Over year old.
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Jafa
Elite Veteran
Location: Sydney, Australia

My Posts This: Topic  Forum		That's the time of one engine revolution, not the time to change from 40% to 80% power delivery, if that were true we would not experience "bogging", note that you are also assuming no load which is clearly not the case


Protos | Logo 400 & 500 | Sceadu Evo | Freya Evo | Trex600N | Avant FX
06-16-2005 Over year old.
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Jose AB
Senior Heliman
Location: Miami,Florida, USA and Dominican. Rep

My Posts This: Topic  Forum		Jafa s answer makes sense.

Jose
06-16-2005 Over year old.
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jkelly
Veteran
Location: Mobile, AL

My Posts This: Topic  Forum		Aww screw it, we need fuel injection!
06-17-2005 Over year old.
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Dr Lodge
Elite Veteran
Location: Guildford, Surrey - UK

My Posts This: Topic  Forum		Bogging is caused by the power output by the engine being less than required to maintain the desired headspeed. You can get bogging if you fly with the throttle constantly at 100%, so it doesn't link directly to engine response.

In our helis, engines are running at a constant speed. If you instantaneously open the carb to full, the engine will see the max fuel/air charge on the next engine cycle and output the maximum power available at that engine speed. This assumes the engine is properly tuned of course.

If you are experiencing bogging, you need more power which equates to a greater throttle opening or if already at 100% throttle, a more powerful engine or possibly a change of ratio to place the engine in a more powerful rev range

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200
06-17-2005 Over year old.
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HIROBO Turbulence - SDX - Freya - Sceadu > What servo's in 60 size Freya
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