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Hitec 5945x 5645 too much money difference for few torque more!

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Hitec 5945x 5645 too much money difference for few torque more!

Old 03-19-2004, 08:22 AM
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Marcelo3DBR
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Default Hitec 5945x 5645 too much money difference for few torque more!

Hi guys, looking at these 2 servos i´ve note that it´s too much money diference for few torque more.

Check this out :

5945
price at tower hobbies : $89,99
torque 4.8/6V : 153/181
speed 4.8/6V : 0.16/0.13
weight : 56g.

5645
price at tower hobbies : $54,99
torque 4.8/6V : 143/168
speed 4.8/6V : 0.23/0.18
weight : 60g.

It´s only 13oz of torque more, and $35 more.

What do you guys think?
Old 03-19-2004, 08:35 AM
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promag
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Default RE: Hitec 5945x 5645 too much money difference for few torque more!

Marcelo

I have both. For sports planes no problem with the 5645.
For competition Hitec recomends the 59XX series because coreless motor has more precision on centering.
I had problems with one of my 5625 (series 56XX) and Hitec give me another NIB.

But you can use both with no major problems.

Buy also a Hitec servo programmer that is very good for servo centering and EPA.

Paulo
Old 03-19-2004, 09:49 AM
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Marcelo3DBR
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Default RE: Hitec 5945x 5645 too much money difference for few torque more!

ORIGINAL: promag

Marcelo

I have both. For sports planes no problem with the 5645.
For competition Hitec recomends the 59XX series because coreless motor has more precision on centering.
I had problems with one of my 5625 (series 56XX) and Hitec give me another NIB.

But you can use both with no major problems.

Buy also a Hitec servo programmer that is very good for servo centering and EPA.

Paulo
Ok Paulo, onde você comprou seus servos e quanto você pagou neles?
Old 03-19-2004, 12:06 PM
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Todd L.
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Default RE: Hitec 5945x 5645 too much money difference for few torque more!

I just ordered 6 Hitec 5945's. Got them for $75.00 ea..... I have 5645's also and only had a problem with one of them. Sent the one i had the problem with back to Hitec and got it back in 2 weeks!!!! Nice service!!!
Old 03-19-2004, 12:26 PM
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Default RE: Hitec 5945x 5645 too much money difference for few torque more!

I have both spec. sheets in front of me now. (Available from the Hitec Web Site)

Both have the beadband listed at 1 microsecond for centering.

However, one of the biggest differences I see is the running current.
The 5945 servos are 1/2 the running current of the 5645 ( 180mA vs 350 mA @ 4.8 VDC).
The 5945 is also listed as waterproof and dustproof whereas the 5645 is not. ( big deal ?? ... depends !)

The 5945 is also a little lighter ( 1.97 oz. vs 2.11 oz) ... and of course, faster.

Worth the extra money ... depends on the application !
Old 03-19-2004, 12:51 PM
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promag
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Default RE: Hitec 5945x 5645 too much money difference for few torque more!

Marcelo

Comprei numa hobbyshop em N.Y. ( America´s Hobby Center) e paguei o mesmo preço da Tower.

Paulo
Old 03-19-2004, 01:28 PM
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Default RE: Hitec 5945x 5645 too much money difference for few torque more!

Comprei numa hobbyshop em Texas (Donalds Hobby Shop)

5645 ah $47.50 ea. em quatro-pak

Hope I said this right ... me not know espanol
englis spell check not help !
Old 03-19-2004, 02:37 PM
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Phil Cole
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Default RE: Hitec 5945x 5645 too much money difference for few torque more!

Speaking Spanish would not help. Portuguese is the national language of Brazil.

There is more to servos than torque and speed. The speed specification is measured after the servo motor has accelerated to full speed. Coreless motors accelerate faster than iron-cored motors, so if you measure the time taken for a servo to move from rest at one position to when it stops at the new position coreless servos will be faster, even if the quoted transit speed is the same.
Old 03-19-2004, 08:08 PM
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Kris^
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Default RE: Hitec 5945x 5645 too much money difference for few torque more!

Here's a BETTER idea. . compare both of these servos to their JR and Futaba equivalents. . .THEN factor in PRICE. .

The 5945 is the best of the lot. . ounce for ounce, cubic dollar for cubic dollar. . .the 5645 is a SPORT servo. . like playing little league against the Major League 5945's. Te get a comparable servo to the 5945 from either JR or Futaba. . you need to add $30-40, and they are NOT programmable!!!

I'm just aghast that this is not blatantly obvious to everyone.
Old 03-20-2004, 11:53 PM
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Default RE: Hitec 5945x 5645 too much money difference for few torque more!

I'm getting 5945s for my CAP because they're faster, coreless, and a bit torquier.
Old 03-21-2004, 12:54 PM
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Default RE: Hitec 5945x 5645 too much money difference for few torque more!

ORIGINAL: MustangFan

I have both spec. sheets in front of me now. (Available from the Hitec Web Site)

Both have the beadband listed at 1 microsecond for centering.

However, one of the biggest differences I see is the running current.
The 5945 servos are 1/2 the running current of the 5645 ( 180mA vs 350 mA @ 4.8 VDC).
MustangFan,

I can't find the spec sheet on the Hitec site that lists the amp draw of the servos. All I find is the specs on size, torque,volts, etc. Could you list the url for me. TIA
Old 03-29-2004, 07:50 AM
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Default RE: Hitec 5945x 5645 too much money difference for few torque more!

The Hitec 5945 servos appear to have the best current to torque ratio of any servos made. They draw less current than a standard low power servo. To me this means longer flight times with a smaller, lighter pack.
Old 03-30-2004, 06:47 AM
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Default RE: Hitec 5945x 5645 too much money difference for few torque more!

I was considering getting some 5925 servo's for my next plane. Whats the deal with the programmer? Can i get away without it?
I have a JR X-3810 radio.
Old 03-30-2004, 01:30 PM
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Default RE: Hitec 5945x 5645 too much money difference for few torque more!

Unless you're gonna put more than one servo per control surface where they can fight each other, you don't need the programmer.
Old 03-30-2004, 04:53 PM
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Default RE: Hitec 5945x 5645 too much money difference for few torque more!

NOGYRO:

Sorry for the delay in answering ...

The Spec Sheet can be accessed once you pull up the "Fact" sheet on the servo.
Usually above the servo picture is a "Spec Sheet" box to click on.


I guess I may as well consider myself a sport pilot, because I don't need that fast of a servo.
A fast servo just processes my mistakes quicker.

Chip Hydes recommendation (on his web site) .16 sec. as fast enough ... but no slower than .25 seconds.
I suppose even if I had faster servos than he uses ... I still couldn't beat him in a contest.
Old 03-30-2004, 05:28 PM
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Default RE: Hitec 5945x 5645 too much money difference for few torque more!

MustangFan

I was hoping you would reply. I had seen the specs on Servo City site but never on the Hitec site. Thanks. Interesting you bring up being a sport flier and servo speed. I flew my Giant Stinger for the past three years on Hitec 645 mg's on 4.8 volts. That gives them a speed of .24. I'm flying a Wild Hare 28% Edge 540 now, and I put 645 mg's in it also, but switched to 6 volts. That increased the speed to .20 and I could tell the difference. Much faster response. But.................was it the plane, or the speed of the servo on 6 volts now. I've never had a digital servo before, but you sure hear everyone talking them up, so when Donalds Hobby had Hitec 5945's on sale, I purchased some. I've got 8 hrs on the Edge with the 645's in them, so I switched the two out in the ailerons and put in the 5945's. Did it make a difference, yes it did. Was it worth $75 per servo? Good question. Now the speed is at .13. I would say that when doing 4 point rolls, I could tell a difference in how sharp and crisp the maneuver was. In a slow roll, no difference. If you were competing, I would say "go for them", but for the average sport flier on a budget, you don't need them to make a plane fly good. The pilot still makes the most difference. What I did find interesting was that when you normally turn your transmitter on, then your receiver, the control surfaces will deflect all the way then return to neutral. The 5945's never quivered, they stayed put.
Old 03-31-2004, 01:27 PM
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Default RE: Hitec 5945x 5645 too much money difference for few torque more!

Hi NOGYRO

Your welcome.

I found it interesting that you have noticed a difference using faster servos.
I have just completed my CAP-X from Chip Hyde. I installed 5625's on all control surfaces except the rudder uses a 5645 for more torque (1 servo).

The reason I went to these digitals was the price was right and to try and get better centering. The 605's and 645's had a little offset when returned to center.
With Donalds Hobby's price of. $47.50 each in lots of 4, it was hard to pass up at least trying a digital. I purchased enough for the CAP-X and a P-51 I am working on. The 59XX servos you are using is even a bigger jump.

On the bench it looks as if the digitals are centering better ... I cycled them for 45 minutes using my 9CAP radio ... no problems found. One forum had posted some of these servos going "hard over" after 10-15 minutes use.
When the weather cooperates, I'll be ready to try this new setup.
However, the CAP-X its self will most likely be the most improvement. I've been flying a GP Wagstaff Extra and a Sig 300XS since returning to the hobby.

I did fly pattern years ago, but decided against competition for now. When I was flying pattern the planes were smaller and the servos slower with a lot less torque. I really like these bigger planes ... but need more power !!! (Tool Time style)

Enjoy the flying ... its coming to a field near me shortly ( dang winter ).

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