RunRyder RC Helicopter Topic - Vibe 90 SG for FAI setup

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Aerobatic FAI F3C Contest > Vibe 90 SG for FAI setup

Dr.Ben
rrProfessor
Location: Richmond, VA, USA

My Posts This: Topic Forum

I was being subtle, Joe. Everyone else picked up on the meaning of a winked eye. So, I'll be more direct for you. It is indeed my understanding that Ito was flying a 520, and as the last post noted, JR doesn't make a blue emblem gyro.

Ben

Representing
MRC Hirobo Helicopters and Team Futaba for Radios
Morgan Fuels
OS Engines

10-28-2009 01:16 PM

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joec
Senior Heliman
Location: VA

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Yea well I heard the he was flying a 7000t that was made to look like a 520.

I'm joking. Well that's really interesting.

10-28-2009 01:45 PM

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Skybolt
Heliman
Location: Ontario, Canada

My Posts This: Topic Forum

Hi Joec,

My source actually saw a 520 in his heli at the W.C. in Muncie.

I wanted to be politically correct and leave the scoop to DR.Ben.

Since I had to buy a gyro for my Freya guest what I got.

10-28-2009 05:14 PM

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blt4ice
Key Veteran
Location: Newark, DE

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So if the 520 can do it then I'm quite sure the Spartan can handle it as well

plus having one already helps too hehe.

Brian
Heli tools used: Torch, Pipe Wrench, 4 ft. crowbar

10-28-2009 06:08 PM

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joec
Senior Heliman
Location: VA

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Blt... Dont get me wrong the Spartan is a great gyro... I have it in my 3D SG... I just preferred the fell of the 7000t.

Like Ben said you need to fly these things and see what you like..

10-28-2009 06:57 PM

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Rchflyer
Heliman
Location: Sterling, VA

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I would suggest to change the receiver, 8v and 8317's didn't work well for me, unless they change to crack hovering. Went back to 5.8 and it works better, but the 8317's are quick.

As far as the funtech and OS HZ, good luck. I couldn't get the combo to work, even with CY's help. (But the funtech does like the YS)

Dennis

10-29-2009 02:46 AM

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ErichF
Elite Veteran
Location: Odessa, FL 33556 (Tampa Area)

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Isn't Doc Ben using the FunTech on his HZ?

BTW, both my Calibers run on MPI single-output, linear regulators at 5.2V for everything. Never an issue in four years running this power system. There's just no need to run more than 5.5 volts on these rigs.

Erich

10-29-2009 02:55 AM

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synodontis
Key Veteran
Location: United Kingdom

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when I mentioned 8317 I tacitly assumed that you would be running them according to spec.

I'm not going to be embroiled in a pointless voltage debate again, but anyone who runs such servos at 8V is asking for trouble, and this goes against their specification so that's the end of it.

10-29-2009 04:52 PM

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blt4ice
Key Veteran
Location: Newark, DE

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I am trying to figure out the disadvantage to using a fast servo vs. a slow one. Wouldn't it really be a mute point? After all a servo is only interpreting what your fingers are doing with the sticks. So I am figuring that if you place a fast servo into a helicopter you will just get a fast response time and not a less stable machine?

Brian
Heli tools used: Torch, Pipe Wrench, 4 ft. crowbar

10-29-2009 05:42 PM

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synodontis
Key Veteran
Location: United Kingdom

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I really don't understand why people need to overload their servos

Probably the best F3C servo that Futaba do is BLS 252, and if that's good enough for all the top pilots, it's good enough for me.

Speed and strength aren't the only factors, otherwise F3C pilots might as well use Align/Hitec super strong/fast servos and be done with it.

I don't get why some people feel the need to go over spec on a servo to "gain the extra 30%" performance or something. Nobody over revs an engine, so why do it to a servo? It's nuts....

10-29-2009 11:44 PM

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joec
Senior Heliman
Location: VA

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Brian

I think the issue with using super fast servos in a F3C machine especially when starting out is that you want to hide your mistakes especially when hovering. Personally I think having a slower servo covers all the little corrections and in turn makes
the heli appear to be smoother

Remember that in hovering your going to deaden the servos a ton with probably 50% or more dual rates and like 25% expo.

Joe

10-30-2009 01:32 AM

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Spacey
Veteran
Location: Pretoria, South Africa

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Smoothness is great, something I don't have in my thumbs. But accuracy is still key, and I've learned the hard way that with accuracy smoothness becomes a given in no time. If you have the thumbs and reactions like the top guys do, guess what speed in servos will become very very handy when things get tough in for instance strong and gusty winds. Torque in the servos will also play very well in your advantage to ensure your swash is doing exactly what you're telling it to.

With the new schedules I personally feel there will be a little more aggresive flying happening to perform some of the manuevers well than in the past, things are changing whether we like it or not. With this a stronger/faster and accurate servo might come in handy.

All that said, I would definitely shy away from overkill! Unless...yes there is a but...the servos are still incredibly accurate. Then why the heck not I say. With the high altitute I fly at I unfortunately frequently end up demanding a little more from my servos than most guys would, I also fly very aggresively in the aerobatics so to ensure my heli stays safely flyable I prefer a little peace of mind. But that is definitely just me (Like it should be with ANY F3C pilot worth calling himself that). So in closing my servo of choice? I run JR 8915's on all my swashplates, however normal 4.8V batteries and I won't change that.

Cheers,
Rudolf

10-30-2009 10:52 AM

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LoveMyTrex
Veteran
Location: Hamilton,VA

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joe, I have flown both of your helis a lot more than you. the spartan gyro and the JR 7000T feel pretty similar to me. I think the 7000T may be a little bit smoother in the hovering. but I would say the spartan is a great choice as well.

the RT 720s with RT fai paddles and heavy weights all the way out works very well with the ASG head. rolls are just fast enough and it tracks very well upstairs and sits well in the hovering.

I know alot of people recommend the pump for f3C but I think the non pump is much more consistent.

Nate.

team Hobby Hangar VA www.hobbyhangarva.com

11-01-2009 01:45 AM

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blt4ice
Key Veteran
Location: Newark, DE

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Thanks for bringing that up Nate, so lets move on to the motors then.

I do have a pump and non-pump .91 HZ that I can use.

So what is the deal with the pump versions?

What are the benefits, I would assume it would have a more consistent flow of fuel to the engine with the pump and regulator?

Brian
Heli tools used: Torch, Pipe Wrench, 4 ft. crowbar

11-01-2009 01:51 AM

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joec
Senior Heliman
Location: VA

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Blt..

Here's what I have learned about OS pumped motors. The pump as you say is supposed to provide more consistent fuel flow. And I know many people have had great success with them in their FAI helis... Bill Tinsley (Canadian FAI Team) for instance.

However, I have had problems with my OS pumped motor... namely a bad regulator. Nate and I chased the tuning on my Sylphide for 3 weeks before we found out I had a bad reg. So I changed my reg and problems were solved... or so we thought. The the other day, we had a situation where the motor went extremely lean in the middle of the flight. I never could put my finger on what happened.

So needless to say, I am getting rid of the pumped motor an switching to the Scott Gray modified carb and SG modified Cline regulator. Which is basically what OS is releasing next year... they are going to be offering a Cline-like reg using crank case pressure.

11-01-2009 01:57 AM

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LoveMyTrex
Veteran
Location: Hamilton,VA

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if the pump and reg worked the way they were suppost to it would be a much better motor. the tuning would be perfectly consistent throught the flight and at different speeds. but the fact is the pump and reg do a pretty crapy job making the tuning very eratic and giving very inconsistent performance.

the non pump is only as consistent as the muffler pressure. but muffler pressure is pretty consistent. it will change slightly from begining to end. but it wont change drasticaly within 30 seconds like the pump can. I guess if your lucky and get a good pump it would be better. but the only pumps I have played with are horrible.

nate.

team Hobby Hangar VA www.hobbyhangarva.com

11-01-2009 01:00 AM

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blt4ice
Key Veteran
Location: Newark, DE

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I understand what you are saying. I see that the pump is nice, but is not neccesary, and why have more areas where a fault can occur. So I spent last night taking the non-pumped out of my 700 and got that all cleaned up and ready to go into the SG.

Makes sense really with the pumped motor you are now adding 2 areas of failure with the pump and regulator. So probably best to make it easier on myself and go with the non-pumped.

Brian
Heli tools used: Torch, Pipe Wrench, 4 ft. crowbar

11-01-2009 01:41 PM

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blt4ice
Key Veteran
Location: Newark, DE

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What should I start at for head speed? I have the 91 hz non-pump, 720SG f3c blades, and the stock 8:1 ratio. I'm using the multigov so I can set up to 3 speed settings.

Brian
Heli tools used: Torch, Pipe Wrench, 4 ft. crowbar

11-13-2009 02:16 AM

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Dr.Ben
rrProfessor
Location: Richmond, VA, USA

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Start with 1500 rpm and adjust from their to suit YOUR tastes and feel and where the motor runs well. Scott Gray runs higher, but that's Scott; it need not be you.

Ben Minor

Representing
MRC Hirobo Helicopters and Team Futaba for Radios
Morgan Fuels
OS Engines

11-13-2009 04:01 AM

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Spacey
Veteran
Location: Pretoria, South Africa

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The SG blades sit better at higher headspeeds, get it closer to 1700RPM, the magic number is just below that but I'll let you rather find it for yourself so you can see the effects.

11-13-2009 06:28 AM

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Aerobatic FAI F3C Contest > Vibe 90 SG for FAI setup

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