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Scale Model RC Helicopters > scale servos- Futaba FP-S148? OK or not?
 
 
CLB
Senior Heliman
Location: Maine

Good afternoon,

I have .50 mechanics that I'm putting into a Century fuse'. It currently has FP-S148 servos on ccpm. Are these ok for this use? Or should I upgrade?

Thank you.

Christian.
02-21-2008 09:10 PM
 
 
Copter Doctor
Elite Veteran
Location: daleville/ft.rucker, al

i had a 30 size longranger that flew with 148's all around for years without failure. they are capable but most like to use sertvos with a bit more umph for even the lightest applications nowadays.

drive a rotary, fly a rotorcraft
02-21-2008 09:19 PM
HOMEPAGE  
 
 
CLB
Senior Heliman
Location: Maine

Thanks Copter Doctor. As long as they will work and not lead to disaster I'll use them. For my applications there won't be anything fancy in terms of flying. Slow and steady!

Christian
02-21-2008 10:10 PM
 
 
Copter Doctor
Elite Veteran
Location: daleville/ft.rucker, al

u know, back in the day when i started flying helis, ccpm was a rare concept and only a few machines used it mechanically at that). in the early stages, it was said to give advantages to the workload of each servo. since there were three working together, they werent required to be as strong as one for each function, in other words, there is strength in numbers. for some reason today, that logic does not seem to be true anymore. it seems to be taboo to use servos like the s148 on a heli, period. course back then there werent many other options anyway but in todays world, a non ball bearinged servo in a heli flying on 15% nitro with a mechanical gyro and spinning wood blades is a sin in the eyes of many
i enjoy being one to occasionally commit that sin however especially to a generation that got started in the hobby without the knowledge such items even existed.
in saying all this, the term you get what you pay for hold true in many ways but you can still get quality and reliability at a very economical price.


drive a rotary, fly a rotorcraft
02-22-2008 12:26 AM
HOMEPAGE  
 
 
HFr
Senior Heliman
Location: Lagrange ,in USA

Well said Emile
02-22-2008 01:06 AM
 
 
CLB
Senior Heliman
Location: Maine

Hello again Copter Doctor,

I second the well-said. There's a place for everything....I don't need and my skill set doesn't require the "latest and greatest". I do however know that I'll have a lot of my hard-earned $ in this scale venture and I'd hate to short-change the project if I used something that is a definite no. I really don't know anything about the servos except what I've read in posts. "Older" but a work-horse seems to be the theme.

Thanks again.

Christian
02-22-2008 01:15 AM
 
 
fritzthecat
Key Veteran
Location: New Orleans

I would spend a few $ and get the BB upgrade for the 148 servo. Makes the servo slopfree and longer lasting. Only about U$5 each. or so.

Fritz


'Send Money, Women and Guns!'
02-22-2008 05:38 AM
 
 
CLB
Senior Heliman
Location: Maine

Hi Fritzthecat,

Thanks for the information. I didn't realize that. I'll do so.

Christian.
02-22-2008 02:06 PM
 
 
AdeH
Senior Heliman
Location: Kent, UK

Ok

I've been flying 2 60 size scale birds on 148's for a few years now, with out any problems.
02-22-2008 02:28 PM
 
 
Copter Doctor
Elite Veteran
Location: daleville/ft.rucker, al

good addition Fritz. a little wisely spent is better than a lot spent in vain.........yeah, yeah thats it.

drive a rotary, fly a rotorcraft
02-22-2008 04:33 PM
HOMEPAGE  
 
 
backpages
New Heliman
Location: Colorado Springs

Futaba FP-S148

Hello Fritzthecat & CD! Fritz,by BB, do you mean BocaBearings? For the heli-model I have, with 5 of the Futaba FP-S148,it's about $20/ea! Ouch! I have to purchase another servo for my new heli and plan to match the other 4 with another FB. This should work until I save $ for a complete replacement? Thanks! BP
07-15-2008 04:11 AM
 
 
fritzthecat
Key Veteran
Location: New Orleans

Tower Hobbies. U$20 for four BB conversions.

http://www3.towerhobbies.com/cgi-bi...p?&I=LXWU87&P=7


Fritz


'Send Money, Women and Guns!'
07-15-2008 04:38 AM
 
 
bcm
Senior Heliman
Location: Tuolumne,CA

I would advise finding some 9202's. They're readily available and a very good servo for what your doing. You should be able to find them either new from an online source or used on RR classifieds. I think you'll be much happier with them.

This message wasnt intended to be a sales pitch, but I have some extras if you would like. PM me if your interested.
07-15-2008 07:03 AM
HOMEPAGE  
 
 
Lockwire
Heliman
Location: Kalkar - Germany

Hi Guys

As you can see by my status I am not a real submitter of posts and also not a real "replyer" but I am flying helis now for a long time as well and I am glad to see comments like the Copter Docter puts in here. I see more and more that people are falling into a habit of using high cost super servos for their helis. people have the feeling that if their Heli weighs 20 lbs they also need Servos that can pull that amount of weight. Then they need the speed and end up mixing Expo on their functions to get some decent behaviour of their Heli. Now I am not a 3D Rookie. Inbetween multiple scale models I have one Caliber 5 where I dare to do a looping with. That's it.
I am currently running a test by putting a datalogger inbetween receiver and Servo an measuring current and voltage during movements and let me tell you it is surprising. Basically you can fly a big Scaler with S148 on a H-3 or H-4 system and I am talking 2m rotordiameter without getting into problems. Ball bearings.....Yes I am all for that as we have the option nowadays but in the days I started I had the same challenges as the Copter Docter. No bearings and 3 lbs of force on our servos, mechanical tail mixing and Gyros that took 2 minutes to warm up and that were heavier than the Nicad Batteries that powered them and guess what, never one crash because of a failed servo only a failing pilot.
Bottom line is to not let yourself get dragged into heavy discussions on servo powers and speeds. If you have a datalogger hang 6 lbs of water in a bottle on a servo arm and measure current, then do that in your heli as well. You will see that the current is definately lower than you would ecpect. currently I am doing one on a heli with 9202's installed, if you want I can share you the data very soon, perhaps that gives people some comfort in their choices.

Regards

Leon
07-17-2008 10:00 PM
 
 
backpages
New Heliman
Location: Colorado Springs

data-logger information

I, for one, would be interested in seeing the data on both tests.
bp
07-18-2008 07:38 PM
 
 
Harris
Senior Heliman
Location: Cyprus

IMHO torque and speed are not everything when choosing servos. You also need to take into account holding power and accuracy, especially with eCCPM. Scale helis will rarely (if ever) need the speed and torque required for 3D but they will still benefit from good digital servos like the 9252 or even better the 9255. You will notice that you will not have to trim the heli all the time...
07-23-2008 09:12 AM
HOMEPAGE  
 
 
Lockwire
Heliman
Location: Kalkar - Germany

Hi

I will get all the data in shortly, last weekend was not a good testing weekend as we only had rain and wind. Coming Sunday it will be good weather according he weatherman, will post on Monday then

Regards

Leon

Isaac Newton was right but why does he need reconfirmation.
07-23-2008 09:00 PM
 
 
heli boi
Heliman
Location: Dothan, Alabama

I totally agree with Copter Doctor. There is nothing wrong with S148's. On a scale heli or just starting out on a fish head. I dare to think how many newbies start out buying all the latest and greatest and havent even flown yet. Then after a crash finding it hard to continue in the hobby because of the high cost of replacements. For scale its your fingers and brain that smooth out a flight. You can fly just as bad with bling bling servos as you can with the classics..lol. Work on your skills and let you equipment follow your progress and not the other way around.
07-27-2008 01:14 PM
 
 
Lockwire
Heliman
Location: Kalkar - Germany

Hi All

Did the test today !

Used a Caliber 5 with 9202 on pitch. I played around with it a little bit in the air. you know full pitch from hover, loopings and that kind of stuff. All 3D flyers laughed but....Hey, I am a scale flyer. The max amps it pulled was 0,3 A. with a Voltage of 5,18 V so that was about 1,554 Watt. Now I will load the servo with weight tomorrow until the same Amps or Wattage is achieved, then I know the amount of weight that the servo had to pull. This is not a 100% accurate test but I know for sure I will not be that far off.

Hi Harris

Saw your comments on the 9255. Now this is exactly what meant by the discussion in this whole topic. this servo is about 140 USD in Europe.
So it has a higher resolution of 2048 or so positions and that is OK. Do consider that you rig it with a transmitter that has perhaps a 9 point calibration curve for H3/H4 setup and you can go from 0 to 100 %. So if you do not have the matching equipment (G3 futaba, I believe) you will not be able to use that resulotion anyway. A bit like putting a 600 Hp block on a Chassis that can only handle 100 Hp. you got the power but cannot use it unfortunately.

Do not want to hammer on my fellow flyers and their taste in equipment, only on the manufactures and sellers that drive us crazy with one update after the other and more expensive all the time. this hobby should be open to anyone but people tend to over purchase on some stuff. I think that most of the dealers would love to sell you a 140 usd servo instead on a 15 USD one. Now I do believe that the truth will be in the middle but not at the top.

Anyway, more will follow.......

Regards

Leon



Isaac Newton was right but why does he need reconfirmation.
07-27-2008 10:46 PM
 
 
Harris
Senior Heliman
Location: Cyprus

Leon, I used the S3001's (same specs with the S148 but with bearing) on my first CCPM heli long time ago simply because I couldn't afford anything better at the time. A month or two later I replaced them with S9250's. I saw a definite improvement in my flying as I didn't have to constantly trim the heli and the swashplate would follow my inputs more reliably. Much later I found that the S9250's started developing some slop so I replaced them with the S9252's. Again I noticed that I could control the heli better in windy conditions. I attributed this to the higher torque and better holding power. Could I still use the 3001's? Yes! Would they still work? Probably yes! How much money would I save? Around $200 per heli. Would this make a difference to my finances? No! Each of my scale helis costs $2000-3000 (plus engine etc, plus electronics) so a saving of $200 is insignificant. I know this is controversial but if $200 makes a big difference for someone then they are probably in the wrong hobby. A single crash because of a stalled servo will cost more...
07-30-2008 11:06 AM
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Scale Model RC Helicopters > scale servos- Futaba FP-S148? OK or not?
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