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Discussion Starter · #1 ·
The brand is bluebird and the specs on this servo is 13kg/ 180oz @ 4.8v or 14.6kg @ 6v.










I will post some pics when I pick it up this week. It's
no high class brand name but I am prepared to be the guinea pig as the
specs got me hooked.



This servo beats the Hitech 5945mg $90US at Tower on raw power. I will buzz you
guys about the build quality and performance with a write up later and
will update the thread if I blow it apart. So much torque.....just what I need to turn this Savage lugger on grass.



MnB












Edited by: milknbutter
 

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Discussion Starter · #2 ·
I just bought this servo, here are the pics I promised.



1. 195oz/ 14.6kg at 6v.

2. Dual ball bearings

3. Metal gears

4. See through case

5. 49g



COST $55au





















I hope the price in no indication on its durability. Can't wait to test it out.



MnB


Edited by: milknbutter
 

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Give us a good review and you honest thoughts once you've evaluated it. Would be great if we could find a cheap but capable steering servo for the savvy.
 

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MnB,


I am using the Hitec 5945 on my Savage and it is great. This thing, with more torque and under half the cost, could be the best thing the Savage world has ever seen.


Couple of things. Please don't be insulted if they are too obvious:

  1. <LI>Have you done the Steering Servo Mod?
    <LI>Have you done the "Grind bits of the hubs" and "Grind bits of the Diff Housing" and "Grind bits off the Drag Link" mod? This gives you superior steering lock. I think there is a thread here somewhere... or did I see it on SC.....</LI>


I must say, with all that torque, the thing I like about 5945 is that in conjunction with my programmer I can set the end points on the servo so that there is no binding. That said, any decent radio will allowyou to set these end points as well, irrespective of whether it is a digital servo or not.


Regards,


ChrisEdited by: AUSRC
 

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the "grinding" thread is on SC and the cheapest hop up for the savy
, should be done even if using the stock steering set up
 

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Thanks Husky, you got the link handy?
 

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Discussion Starter · #7 ·
Here is my review of the Blue Bird BMS-630MG Super Stong. Dn't mnind the gramer erors and pathitic speling.</font>

<br style="font-weight: bold;">
</font>

Specs: </span>




1. 14.6kg/ 195oz @ 6v


2. metal gears


3. Dual ball bearings

</font>

4. $55au at hobby shops</font>





</span><br style="font-style: italic;">
</span></font></span></font>A little introduction:</span>



Its cheap, talking US dollars its about $40us or $55au (available in
hobby shops locally for $55au) so is comparable to the Hitech 645MG on price but
outclasses it in raw power. The torque rating of 14.6kg beats most
other heavy duty servos as well.

<br style="font-weight: bold;">
My personal impression:</span>



This servo is like an old skool V8. No fancy built in failsafe, no
mainstream brand name, no latest gizmos like digital control, no twice
the speed response of normal servos marketing hysteria, etc, etc. What it does
have is raw brute twisting torque. Like an old
V8, it doesn't need no fancy gizmos. With it's all metal gears, dual bb
and monster 195oz of torque, it really is a servo that just
does the job right the first time. Shall we begin.....







Let's talk setup:



</span>HPI Savage 25 RTR with Monster Pirate servo saver mod, Team
Orion 5 cells 1200mah 6v receiver batteries, Ofna aluminium servo
horn*.



*Regarding the aluminium/ metal horn, it is ESSENTIAL in this
application. I did test the plastic horn that comes with this servo but
there is evident 'twist' in the plastic horn when the tires are
grounded on high traction surfaces such as carpet and concrete floors
as the servo tries to turn the tires to each side and the only thing
that gave a little was the plastic horn.



Stop babbling, lets take it to the track:</span>



Previously using the SF-2 stock steering servo on the Savage, I didn't
drive my Savage on grass much. The stock steering servo just cannot
hold the wheel position at high speed turns. Let's see if the bluey changes that.



I took the Savage to my local football size park, that has short grass. Switched
my radio on, fired the Savage up thinking, I will blow this
cheapo servo in 2 mins on such a high traction surface and will be back
home in time for early dinner.



Squeezing the throttle, the Savage semi-wheelies away from me. Full
speed there it goes, first turn, CRASH, traction rolled 6 times, landed
on the tires, do'h, pressed the accelerator again, Savage took off
(relief), 2nd high speed turn, CRASH, traction rolled again but
this time cart wheeled
and flipped forward about 4 times landing on the roof. Gasp! Those
stock tires are tracking well on short grass, a little too well. I run over thinking,
bashed engine mount, crapped body posts, toasted cheap servo!
Nope.....flipped the truck back on it's wheels, learning from previous
roll-overs, eased on the steering a bit.


So, hows the steering? This blue bird 630MG is very violent as it slams the stock tires left
and right. You have to re-learn driving habits. I am now braking even
more so, whilst doing turns, even low radius turns. This servo swings
the tires and locks it there no matter if you are doing 10km/h or
65km/h., that's why I was contantly rolling the Savage.



After a few runs, my impression? Man screw all this flipping and
roll-overs at high speeds. Brought the Savage back to me,
took the shock spacers out to lower the metal ie. lower centre of
gravity (CG). Let's hope this helps reduce the flipping dance....


The lowered stance did help a little but I still tipped the Savage even at slow speeds as the servos WACKS
those tires and hold it in position without budging. I keep forgetting
to 'dial back' my hand movment on the radio. The Savage really points to
where you want at ANY speeds. I also took this oppurtunity to tackle
some gravel tracks around the park. It handles on dirt like a truggy
(buggy/truck). With
pin point accurate handling, you can place this hefty metal at any point on
the track. I was 'rally driving' like a pro with the lowered
stance from removing the shock spacers.



So the HPI monster is steering a little too well and now because of
that is showing the engineering downfalls of the Savage's design, being
a top heavy model, a servo with this much torque will easily flip the
Savage if you are not too easy on the steering dial especially on a
surface like grass.



I would recommend an upgrade to a lower profile tire, maybe a proline
40 series setup. The stock tires have showed it's limitation, atleast
on a grass surface.



There is no denying of the torque on these servos. On gravel, you
will be swapping your rear-end even doing a dismal speed of 15km/h.
What I also found quite good was the centering. The Savage tracks
straight and true even after my 4 tanks of real high speed cornering abuse.



Now lets check the damage:</span>


Lexan Body - a little more out of shape. Servo horn - nice and tight. Any slop
coming out of the servo itself? Nope. The tires? Yikes, the shape of
the sidewall is really out of proportion because of the stress of
cornering at high speeds. Now with the ability of high speed cornering, the problem with loose tire sidewalls come
to play but that is a trait of all stock tires. Nothing a bit of hard tire
squeezing doesn't fix, and in no time the tires have reshaped to the
normal shape.


My Installation Hints (own opinion here):</span>


1. This servo will swing the wheels left and right with quite a bit
of torque that I
think other upgrades to the steering setup may be in order such as
aluminium
or heavy duty steering rods, titanium balls, etc. For now I run the
stock steering parts and it has shown no sign of wear but I surely
think it will wear out quicker in the future.



2. Forget about using
the stock servo saver, there is no way a stock servo saver will handle
the torque of this servo. MP mod users should apply here only.



3. If you
are upgrading to a similar powered servo, when installing, also make sure all the
bolts and screws are tight (but allow free movements of all rods,
obviously). If any bolt or screw is loose, whilst using an aluminium
horn, the servos torque will just simply twist it out of place damaging
the plastic parts even with the MP servo saver installed as I found out with my initial rough installation last night
at 1 am.



4. Upgrade to offset wheels with normal size tires or get a prolines 40
series setup, that will truly shine with this servo. The increased
width will reduce the high speed roll overs too.



The true test I guess will be the durability, but I bet my steering
rods and balls will break before the servo gives leeway. Lunsford
titanium steering bits maybe on my desk sooner then I thought. Not
much else to say really, too much power? Well at $55au I really don't care,
mate.



I think this brawny V8 has the balls to out shine the latest "hi tech" plants.



milknbutter










Edited by: milknbutter
 

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MnB,


If I was paranoid, I'd swear you worked for Blue Bird and were launching a viral marketing campaign. JUST KIDDING.


It really sounds like a great servo. What spline pattern does it use?


I have to agree, it seems like a good old fashion ball buster. Keep us informed of it's endurance.


Thanks,


Chris
 

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Discussion Starter · #9 ·
Ausrc, after re-reading my review, hmmm you may be correct. It does
sound like a viral marketing type of post. Damn, I tried my best, my
first review, I hope I didn't make the read a bore sounding like an
advertising agency.



If I did, hmmmm.....I stand behind what I say though. I will do an
update in a few bash sessions to check on the durability but initial
impressions are might good. Never knew such a cheap servo could do what
it actually says.



MnB
 

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MnB,


The review was excellent. Having had a couple of posts regarding paranoid behaviour lately, I thought I would "play it up".


In all honesty, Top Job
. Now it is just a matter of how will it stand up to the vigors of Savage Bashing.


Regards,


Chris
 

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M&B, great review mate. :tup:


I'll split the posts about the servo out into their own thread as a find like this deserves some exposure.
 

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Discussion Starter · #15 ·
To UncySpam



Yes RC Hobbies is the place I got it from. When I reviewed it,
the steering performance really blew me away especially at how well I
could control my Savage with pin point accuracy. I really didn't
expect that from a $50au servo.



As for the guys using them in the Hyper 7's, God, I am actually very
surprised that the whole steering system in those models don't snap off
due to the torque rating on these servos.



From my bash and track sessions, I can say that the durability on the
bluey is not an issue. BUT, use an aluminium servo horn as I have
mentioned in the review. Also make sure your steering setup is tight
with no loose screws (the servo will bend the screws out of the plastic
rods with half a turn on the steering knob
)



Also an upgrade to the rod (#85050) that connects the servo horn to the
servo saver is also advisable as I am starting to see some play in that
rod due to the extra torque stress.



To Mini-T



I am sure you also won't be dissapointed....just reinforce your roll bars




MnB





Edited by: milknbutter
 

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the guys with the hyper7's are running lower powered versions I believe - more around the8 kilo mark me thinks, as andrew said it was pretty much equivalent to a 645mg at about half the price.


thanks for the feedback... much appreciated!
 

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do rchobbies sell the 621mg and 620mg.??


i want these for my hyper7 ~ these have a bit less TQ but more speed.





cheers
 
G

·
Hi guys


I thought i would throw my 20 cents worth in here. I have run the blue bird 630


on my Hyper 7(Actually 2 as the first 1 lasted 2 days


1. Servo #1 blew up after 2 days ( I was still running my buggy in)


2. Servo #2 lasted 2 weeks. I pulled my car apart to give it a good clean and found three of the screws missing out of the body of the servo. I pull the servo out of my car to find 2 of the holes you screw the servo on with where broken(may have been from crashing who knows). I found one of the body screws under the servo in my car i tried to screw it back into the servo only to fing the thread stripped (I had never touched these screws). I have now purchased a Hitec hope i have more luck with it. Anyone using a Hitec 5645??
 

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I blew my Hitec 5645MG in a few tanks. It wasn't the gears but
something fried the digital circuit. I only use Futaba, they cost heaps
more, but you cannot put a price on quality.



Dunno about the Blue Bird tho....



brodski
 
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