WHITE-TRASH
I wanna be Dave
I have lower power servos in a few rigs but when someone wants more power for their application it is never too much.
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Savox 900oz servo
- Thread starter nalby
- Start date
I have lower power servos in a few rigs but when someone wants more power for their application it is never too much.
Kingmeow
Quarry Creeper
So lets's exaggerate the servo arm to be 2 inches. That means the servo can lift/push 450 oz. That's 28 POUNDS! :shock: Of course that's exaggerating the servo arm to be 2 inches. Anything less will only make that 28 pounds larger.
We really need more than that for our 1/10 purposes?
Please read my post again. It's saying the same thing you are saying and yes you can compare torque to pounds if you know the length of the moment arm. In my example I was assuming 2 inches to be overly conservative to arrive at the pound number. :mrgreen:
midwest_rippa
Pebble Pounder
you are correct. my mistake. this 900 oz in also means the servo makes 4.7 lbft torque. just seems almost unbelievable for the size
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Kingmeow
Quarry Creeper
No problem. Yes, that is unbelievable like you said, more like incredible. And all our rigs are under 10 lbs and that's VERY conservative. So a 900 oz. servo... :shock:
WHITE-TRASH
I wanna be Dave
Yea it's pretty good. I have 2290s in 5 rigs and I'm not taking them out anytime soon.
I used to be of the thought that cheap servos ruled and they were "good enough". Well the truth is that they are "good enough" for my average trail rigs. But once you get a fast and super powerful servo you don't want to go back.
soze
I wanna be Dave
Me too. I used to shy away from having to use BECs too.....
I'd still get some of those cheapies as backups, but I definitely like the stronger/faster servos now.
Crawler Cads
Quarry Creeper
I see so many "do I really need a bec" posts still, usually mated to a "my ESC has a 7v bec". I like pointing at the amps at that point [emoji38]
Not much competition for savox and the 2290 but I still love my Promodeler 470. It's soo smooth and quiet.
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Oh I still avoid external BEC's at all costs! :mrgreen:
josh9mile
Pebble Pounder
Rc Review tested the 2290 and it barely broke 500oz. Kinda disappointing since I own 2 of them. https://youtu.be/yhcCDPBdjyE
Meatwad
I wanna be Dave
The good thing about going through a cheap servo phase is having a bunch of winch servos to play with.
mikemcE
I wanna be Dave
I always watch Francis and have the salt shaker nearby. His unbiased test is OK, but look at his rig for testing. The servo arm must me 60mm.... that will drastically change torque to the tires, most servos specs are rated with 20mm arms?
Hang up and Drive
Xx Losungen xX
Rock Crawler
I agree with ya, his testing is entertainment.
The length of the arm though shouldn't matter, the servo is pulling up, the arm is just a linkage, doesn't matter how long it is. If the servo horn was 60mm, that'd be a different story.
josh9mile
Pebble Pounder
I bet the arm is 26mm/1inch
punkindrublik
Quarry Creeper
The length of the arm most surely does matter. Rule of leverage. Try picking up a weight tied to a 10" stick, easy. Make that stick 20" and it will be much harder to lift. It's on a much smaller scale, but you bet it makes a difference.
mikemcE
I wanna be Dave
Arm length doesn’t change the servo, it does change the effect on the linkage.
I did try this on my Bullyll, a double length horn did cut the reaction dramatically.
Here’s a good read: https://www.rcuniverse.com/forum/aerodynamics-76/2666774-servo-torque-arm-length.html
Hang up and Drive
I did try this on my Bullyll, a double length horn did cut the reaction dramatically.
Here’s a good read: https://www.rcuniverse.com/forum/aerodynamics-76/2666774-servo-torque-arm-length.html
Hang up and Drive
Xx Losungen xX
Rock Crawler
He's not changed the length of the servo horn though. Look at the video again, it's a standard length servo horn.
The stick analogy doesn't work because the leverage is all on the servo horn, the linkage length is irrelevant, the linkage is not a lever in his test, the servo horn is.
The stick analogy doesn't work because the leverage is all on the servo horn, the linkage length is irrelevant, the linkage is not a lever in his test, the servo horn is.
Xx Losungen xX
Rock Crawler
Unless that stick is straight up and down. Imagine holding a bucket and lifting it, now put that bucket on the ground, tie a rope to it and lift it.
It'll take the same amount of force, in his test, the arm is the same as the rope in my example. There is no leverage on the arm, it's all on the servo horn.
Xx Losungen xX
Rock Crawler
Yes, of course doubling the length of the servo horn will have an effect.
Is that what you've been talking about??? You said arm so I thought you meant the silver linkage arm, not the horn itself.
mikemcE
I wanna be Dave
Yup, sorry, Horn and Arm are interchangeable. It looks as Francis is using a longer horn than 20/25mm
Hang up and Drive
