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Tail Servo Reccomendations for Blade 400

Old 01-29-2008, 04:51 AM
  #1  
Lymph
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Default Tail Servo Reccomendations for Blade 400

As the topic states, looking for any advise or feedback on a digital servo to use for the Blade 400 tail servo.

Thanks.
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Old 01-29-2008, 01:17 PM
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bassplayinDude
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Well, I've read the DSP75 servo is a drop-in replacement for the DS75 servo that comes with the B400. The DSP75 also uses the same gears the DS75 servos do so you can buy common parts to fix them.
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Old 01-30-2008, 01:33 AM
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Lymph
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Sounds like a good option, very cheap but Spektrum has a good reputation and its got to be an advantage over the stock servo being digital.

Might look at getting one to try out.
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Old 01-31-2008, 07:26 AM
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Revolution 3.3
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The stock DS75 is a digital servo. Not top notch, mind you, but a digital servo nevertheless... I was eyeing the Hitec HS-5065 MG... It is metal geared, with weight 12g... Don't know how much that would affect weight balance... Also took a peek at the Futaba FUTM0654... looks to be really nice...
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Old 01-31-2008, 01:05 PM
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I read a post somewhere yesterday on some forum (maybe Helifreak?) that said the JR 285MG is a drop-in replacement for the DS75 servos.

Here's a comparison of specs for the DS75, DSP75 and JRPS285MG servos:

DS75
Type: Digital Sub-Micro
Dimensions (WxLxH): .45 x .90 x .94 in (12 x 23 x 24mm)
Weight: .26 oz (7.5 g)

DSP75
Type:Programmable Digital Sub Micro
Torque:19.0 oz/in @ 4.8v
Speed:.11 sec/60 @ 4.8v
Dimensions (WxLxH):.90x.45x.94” (23x12x24mm)
Weight:.26oz. (7.5g)

JRPS285MG
Type: Digital Hi-Speed Metal Gear Sub-Micro
Torque: 17 oz/in @ 4.8V, 19 oz/in @ 6V
Speed: .18 sec/60 degrees @ 4.8V, .14 sec/60 degrees @ 6V
Dimensions (WxLxH): 0.45" x 0.87" x 0.85"
Weight: 12 grams, .42 oz
Motor Type: 3-pole ferrite
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Old 01-31-2008, 09:35 PM
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Nice info, only concerning thing is the JRPS285MG servo is heavier, slower and less torque. Oh and double the price of the DSP75....
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Old 02-01-2008, 12:58 PM
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Originally Posted by Lymph View Post
Nice info, only concerning thing is the JRPS285MG servo is heavier, slower and less torque. Oh and double the price of the DSP75....

Yes, but it has metal gears so it won't spit teeth like a 2nd grader after a schoolyard brawl if you land your heli too hard.
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Old 02-01-2008, 11:13 PM
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FWIW, I just found this today:

http://www.horizonhobby.com/Products...rodID=JRPF300H

I googled around and found many people recommending the gyro servo that is in that package. They were also recommending the JRPS285MG for the cyclic, as bassplayinDude was. The only unfortunate thing is that package doesn't have the metal gear version.

However, I priced all of that together with the metal gear version and it was like $230. So you could save yourself $70 and just buy some replacement plastic gear sets for the servos at a few bucks a pop. I think I might do this if Horizon can't restock the standard replacement servos any time soon.
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Old 02-05-2008, 06:57 AM
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I have a futaba 9257 on my blade 400 and love it.
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Old 05-16-2008, 03:31 PM
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weru
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Originally Posted by heliman4u View Post
I have a futaba 9257 on my blade 400 and love it.
Did you do any modification to install the 9257? Which gyro are you using? Could I use the stock gyro with that servo in digital mode?
Thanks.
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Old 05-17-2008, 12:48 AM
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neilg.
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why wouldn't Spektrum sell drop in servos for the blade 400. there are already Spektrum parts installed in it plus the radio.

and i don't understand why the tail servo is different than other servos (analog versus digital). but i do know that the heading lock gyro has to be set a certain way.
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Old 06-22-2008, 02:59 PM
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Laszlo
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Default B 400 Tail Servo Options

My bird has crashed - another pilot error!

While working on the head, it seems I stripped the gears of my tail servo (original). I recalled that RC Heli Mag, in their review of the Blade 400, recommended the JRPF300H servo pack as the "first upgrade". Better centring etc. etc...) So I started to look and here I am.

Reading this thread gives a number of options. Now here comes the 'dumb question' - how do you program a 'programmable digital servo' - like the DSP75?

Thanks
Laszlo
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Old 06-23-2008, 01:38 AM
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In order to program the DSP75, you'll need the $25 servo programming doohickey.
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Old 06-23-2008, 04:41 PM
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Laszlo
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Thanks for the enlightenment! I had no idea this thingy was in existence.
I just realized that I already have a DSP75 in my heli. one of the DS75s stripped soon out of the box and while I was waiting for a replacement from E-flite, the local hobby shop sold me a DSP75. The heli acted crazy after I installed it. Back to the LHS where it took about 2 minutes for the guys to reset (reverse) pone of the program settings in the DX6i and this change fixed the problem. I guess the DSP75 could have been programmed to avoid the reprogramming setup in the DX6i.

In any case we all learn!

Thanks again
Laszlo

------------------------------
E-flite BCX2 and B400 3D
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Old 06-23-2008, 07:02 PM
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No, that isn't what the servo programmer will do. The servo programmer allows you to set endpoints and change the servo from airplane to heli tail servo mode as well as a couple of other things. You'll still need to do servo reversing in the Tx if you swap out DS75 servos with DSP75s.
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Old 06-23-2008, 08:07 PM
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Thanks, the more knowledge the better we are. I have no planes so its OK. By the way somewhere I read that the DSP75 'out of the box' worked as a tail servo without any changes. Any comment on this?

I am thinking to move my DSP75 to replace the stock (and striped) DS75 tail servo and use the DS75 I received under warranty (still 'in the box') for the aileron. Any comment on this idea? Or, since my heli is in the hangar anyway, should I just shell out a few box and replace all DS75s with DSP75s?

Laszlo

------------------------------
E-flite BCX2 and B400 3D
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Old 04-23-2011, 03:20 PM
  #17  
rknaub
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Default Tail Serv & Gyro

Just picked up a Futaba GY401 and a JR DS290G for my tail servo. Very impressed with the way the 400 flies now. The 290G was a perfect fit for the tail servo, and the GY401 was a breeze to set up. Best upgrades I've done so far.
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