martinoto

Hi,

I am looking for better servos for a new pattern plane. Besides the required torque I am looking at the speed numbers. My question is, will I notice the difference between, say, a 0.22 sec servo and a .13 sec servo?. The difference in price is an important one. Besides, it seems that the "grey area" is not there anymore: you have $ 13 servos and $ 75 and up servos (at least on the Futaba line).

And if you look only at this information, you can get caught anyway I always preferred S3001's instead of S3004's, becuase I thought they were better in genera, and now I realized 3004's has better response time and much torque. [&o]

I would pay the difference [&o], but only if I can feel the difference in response time, because you can go up to $300 on servos, and this figure doesn't include the ones choosen by CPLR or JAS oe QQ.

Thanks for your thoughts
Regards

rmh

Which one responds the fastest may NOT be the one which has enough power to throw the surface very far - so
YOU have to decide what your setup will be
the one with the tightest control-or most throw will use the most battery power.
If you are playing follow the leader -then be prepared to spend a lot.

MikeMayberry

My Feedback: (1)

What's more important than the specs for your application is the construction of the servo and what level of componentry is used. For pattern you will want a coreless motor servo at the minimum with digital/coreless being optimum. Some pattern guys will also only use nylon gears for more pecision as there is always a tiny amount of slop in most metal geared servos, although nylon gears can "flex."

The best choice in the Hitec brand for pattern is the HS-6975HB which is digital/coreless and at .14sec@119in/oz (4.8v), it offers plenty of torque and speed but what makes it really shine is the super tight Karbonite geartrain that has zero slop or flex. Price is around $80ea. Here's the info: http://www.hitecrcd.com/servos/show?name=HS-6975HB

Mike.

martinoto

Dick, Mike, thanks for the answers.

My question is if I will notice the difference between a 0.22 sec servo and a 0.14 sec servo, given a fix torque. That is considering medium priced servos, because this is going to be a "trainer" pattern plane, 90 size.

My first choice were Futabas S9001, which are coreless and has enough torque for the design. They are relatively cheap too at $29.99. But the response time is 0.22 sec. at 4.8V.
Going to faster servos means more than double the price. I would do it, but only if the difference is noticeable somehow.

I also noticed that the choices are few at this price level. There are not many options if you want to upgrade your standard servos without going "pro". For $80 and up you have plenty of possibilities betrween coreless, digitals, metal or plastic gears, more speed, more torque or more both. But if you want to stay below $40, possibilities are scarce.
Maybe the Manufacturers decided to rise the bottom price for the servos...

Thanks and regards.

yakman

I can notice the difference and the difference is more pronounced the smaller the plane.

MikeMayberry

My Feedback: (1)

The faster servos will make the plane respond quicker but for smooth, flowing manuevers it won't make much difference. I'm not sure how Futaba can build a coreless servo for $30 because most of their coreless servos are in the $80 range, so don't expect ultra precision for that price but it may be fine if your skills are still developing.

Mike.

martinoto

Yakman, thanks for the info.
Mike, thanks, my skills are still developing. I just wanted to upgrade from my 3001's, without spending 100 bucks per servo...

Regards

rmh

The Spektrum 2.4 type radios and the X9303 work extremely well with NON digital and NON coreless servos - faster response and supe smoothness
I found that really good cheap servos work -using this system, the 32 buck 126 SPORT JR on smaller planes is dead accurate and has 140 inch ounces of torque on 6 volts - and no jitters .
If you feel you have to have the other type servos - go ahead- but do yourselves a favor and try some comparison testing --
The smoothness and precision of the X9303 -or- the DX7 with good basic non digital servos is very impressive.
If you are still (?) flying on 72 with PCM and earlier radio setups - yeh- the higher buck servos will do better -
PS you did know QQ won the pattern biggie , with a JR and the 2.4 setup---------

martinoto

Dick, good information, I didn't know that "by-product" of spectrum technology.
Now, if I have to move to spectrum in order to improve my speed using standard servos... I don't know, I will make the business case, but I don't think is going to pass the Wife Department. LOL

Thanks, seriously, I am not moving to spectrum yet, before that I going to try some digitals

Regards