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HomeAircraftHelicopterFuel-Helicopters New or Limited ActivityElyQ › Ok.. Anything else i need to buy, change or upgrade?
01-15-2010 12:13 PM  8 years agoPost 1
gibuk

rrNovice

UK, midlands

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Hi, ive recently received my "2nd hand but like new" vision 50 ultimate and after reading some of the threads on here i really want to make sure ive ironed out most "major" issues before i begin to fly it.

So far i have cleaned & regreased the bearings and oiled shafts ETC.

Ive purchased:
Metal tail pitch fork
Align 600n ball links
3x s3152 servos for cyclic

Im using a 401 gyro with an s9253 and a standard s3001 on throttle (that ok?)

And im using a OS 50 hyper.

Thanks
Andy

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01-15-2010 03:34 PM  8 years agoPost 2
Alexm0324

rrApprentice

Atlanta, Georgia USA

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Your throttle servo is slower than your cyclic servos. You always want the fastest throttle servo you can afford to avoid bogging. At the very least go with a servo that is the same speed as the cyclic if you have to. I always go with a faster one, especially with a rev limiter or governor.
Hyperion makes a nice servo for the money that I use for the throttle (2 plus years of service). I use the DS20GMD since it is inexpensive and fast even at 4.8V. In the longer run you might want to upgrade to a higher torque cyclic servo depending on your flying style. I like to set a minimum of around 95 oz. in. of torque on this bird. The cyclic pulls pretty hard if you do 3D.

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01-15-2010 03:53 PM  8 years agoPost 3
gibuk

rrNovice

UK, midlands

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Hi, thanks for the advise. Never really thought about that, hence i stuck the lower end servo in there as i thought its least important. Im wrong!

Although im not actually doing 3D on the field (as apposed to in a sim) so probably not that important right now , which brings me to my next point i am next in line to start trying the actions on the field so i still want to get the kit right now.

So ill go for a good servo, ill deffo look into the ones you suggested.
Thanks

Andy

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01-16-2010 03:32 PM  8 years agoPost 4
jschenck

rrProfessor

La Vista, NE.

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I disagree with the throttle servo. I've run a Futaba S148 on the throttle and did acrobatic flying - flips, loops, rolls and even some tic-toc's. Run's just fine. If you are buying a new throttle servo I'd look for one rated faster than .18 sec but running a 3001 will work just fine from my experience. Even my gasser has a 3010 on the throttle and it works just fine. In idle-up mode the throttle servo moves about 1/2 the distance compared to the cyclic servos even from full negative to full positive plus there is no load on the throttle servo. Try the 3001 before deciding you need to buy an expensive fast servo for the throttle.

The other 'issue' I ran into besides the tail fork is the clutch. This one is kind of a pain with a machine that's already assembled but it may prevent a broken clutch. You'll need to measure the diameter of the bell/liner and compare it to the clutch. Reline the bell if the gap is too big. If the gap is too big you'll break the clutch. Read these threads -->

https://rc.runryder.com/t517573p1
https://rc.runryder.com/t516871p1
https://rc.runryder.com/t557726p1

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01-16-2010 05:54 PM  8 years agoPost 5
leadlag

rrVeteran

Worthing UK

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Il second jschenck.

Guys think they need a very fast throttle servo but you don't.

The reason being is when you are in Idle up the throttle servo has a very short distance to travel to match power demand from the engine. It is traveling maxiumum, half its travel distance and in practice less than this.

I run standard a standard Futaba digital servo on my 90 and a 3001 on my 50 .

I do power demanding 3d and the engine stays ontop of the RPM no problem.

Save you money.

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01-16-2010 10:39 PM  8 years agoPost 6
Alexm0324

rrApprentice

Atlanta, Georgia USA

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I suggested the Hyperion because it is a cheap (about $35) and fast servo.
I agree that it is not necessary and not many things are not "necessary". Every governor and rev limiter manufacturer suggests you use the fastest servo you can buy for the throttle. If you don't run a governor or rev limiter it probably isn't an issue to most people. Even Ray Hostetler in his Helitech series recommends a fast throttle servo. He even recommends it if you are just running throttle curves. I consider Ray an authority on helicopters.

So yes, you can save your money if you do not plan to run a governor or rev limiter, especially if you are just sport flying. I can say that I did notice a slight performance gain when I switched to a servo that was faster than my cyclics for the throttle. But I have always run a rev limiter (AR7100R or RevMax).

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01-17-2010 05:42 AM  8 years agoPost 7
jschenck

rrProfessor

La Vista, NE.

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I'll relay my own experience here. My typical setup is a Hitec HS525 throttle servo (analog, cored servo but 'faster' .18 servo) being ran by a TJ Pro. For my style flying that produces a very constant RPM. I've had it tach'd while doing flips and other horsing around - varied by 10-20 RPM. I don't fly the hard stop pop-n-lock flying, don't have the fingers for it but am comfortable with most basic acrobatics and the heli holds RPM just fine with my setup. I think that tuning the engine has much more effect on throttle response than the 1/20th of a second a slow servo will give compared to a 9254 or such (remember it only moved 1/2 the travel in idle-up)

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01-17-2010 11:09 AM  8 years agoPost 8
gibuk

rrNovice

UK, midlands

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Thanks guys for the advise. Lots of god stuff there.

Its coming along now, luck forward to getting it inthe air!

Cheers
Andy

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01-21-2010 03:43 AM  8 years agoPost 9
oragami

rrVeteran

Florida

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If you can afford to put a high speed servo on the throttle, it does work much better. You governor won't cycle as much, which makes it easier on the whole system.

If you are not flying hard 3-d with the helicopter, then don't worry about spending the extra money on a servo for the throttle right now. Actually Hyperion makes a pretty good servo for the throttle, and it is cheap.

Your cyclic servo's? Spend the money and get some 8717's if possible, and just go enjoy them. IMO these servos are the best on that machine, or any other machine for that matter, and will provide many hours of flying, and crashing without needing repair. The JR stuff is Unbeatable.

Gyro? I would again, spend the money and get a Spartan and run either a Futaba 9256, or a JR 8900G with it. By far the best Gyro available to date. Don't settle for cheap immitations, buy the good stuff once, and you wont regret it. Not to mention, that the resale on good name brand equipment alway's yields a good return when you get ready to part with it.

Absolutely use the 7100R. Is by far the best performing and easiest unit to use, set up, and understand.

Hope this helps

Craig

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01-21-2010 08:53 AM  8 years agoPost 10
naked painter

rrVeteran

Mid glamorgan uk

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I use a 148 and it's fine..

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01-21-2010 04:43 PM  8 years agoPost 11
az_heliguy

rrKey Veteran

San Tan Valley, AZ

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i use a jr ds290g on my throttle for both my vision comps and they work great with the gv-1

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