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Old May 19, 2003, 03:00 AM
john alt
Guest
n/a Posts
Anyone try Blue Bird Servos

I saw these servos over at Balsa Products. Here's a link to it:

http://makeashorterlink.com/?H48B36C94

Vitals:
8 grams
43 Oz torque
..12 secs/60 deg/4.8V
And last but not least, $14.75

I thought they were too good to be true, and sent BP an email asking to
confirm the specs, specifically the torque. They sent this:

"John,
We did not believe them either. So we measured the torque using a
digital fish scale. The numbers were accurate."

Ok, I trust BP, but I'd never heard of Blue Bird. Has anyone tried
these? I am probably going to get a handful to play with anyway, and was
curious about the centering, gear train strength, etc. Seems like I
could save a lot of weight using these instead of Hitec 422 and the like
in many apps. The 6 gram model looks nice for electrics.
Old May 19, 2003, 03:00 AM
GuW
Guest
n/a Posts
Re: Anyone try Blue Bird Servos

Please keep us posted about how they are working out for you.
From the info on the site, they look promising, but after tonight I rather
have someone else testing them for me.
(at the local field, one of the flyers stripped the elevator servo gears,
and lost a newbuilt model)





Old May 22, 2003, 03:00 AM
IFly
Guest
n/a Posts
Re: Anyone try Blue Bird Servos

Hmm, extremely light, extremely powerful and cheap. Sounds too good to be
true. I can't imagine nylon gears that small being able to handle that much
torque.


"john alt" <johnaltDoesntneedSpam@charter.net> wrote in message
news:vcfjgpm92615de@corp.supernews.com...
> I saw these servos over at Balsa Products. Here's a link to it:
>
> http://makeashorterlink.com/?H48B36C94
>
> Vitals:
> 8 grams
> 43 Oz torque
> .12 secs/60 deg/4.8V
> And last but not least, $14.75
>
> I thought they were too good to be true, and sent BP an email asking to
> confirm the specs, specifically the torque. They sent this:
>
> "John,
> We did not believe them either. So we measured the torque using a
> digital fish scale. The numbers were accurate."
>
> Ok, I trust BP, but I'd never heard of Blue Bird. Has anyone tried
> these? I am probably going to get a handful to play with anyway, and was
> curious about the centering, gear train strength, etc. Seems like I
> could save a lot of weight using these instead of Hitec 422 and the like
> in many apps. The 6 gram model looks nice for electrics.



Old May 22, 2003, 03:00 AM
Mathew Kirsch
Guest
n/a Posts
Re: Anyone try Blue Bird Servos

john alt <johnaltDoesntneedSpam@charter.net> wrote in message news:<vcfjgpm92615de@corp.supernews.com>...
> I saw these servos over at Balsa Products. Here's a link to it:


> I thought they were too good to be true, and sent BP an email asking to
> confirm the specs, specifically the torque. They sent this:


They're probably just rebadged GWS servos, like many others.
Old May 22, 2003, 03:00 AM
Boo
Guest
n/a Posts
Re: Anyone try Blue Bird Servos

> Hmm, extremely light, extremely powerful and cheap. Sounds too good to be
> true. I can't imagine nylon gears that small being able to handle that much
> torque.


I wondered if the oz torque rating is measured an a centimetre instead
of an inch ? If you convert from the metric to "imperial" then they are
out by a factor of 2.54...

--
Boo


Old May 22, 2003, 03:00 AM
IFly
Guest
n/a Posts
Re: Anyone try Blue Bird Servos


"Boo" <Boo@spam_me_no_spam.net> wrote in message
news:bagmgj$9gu$2@newsg1.svr.pol.co.uk...
> > Hmm, extremely light, extremely powerful and cheap. Sounds too good to

be
> > true. I can't imagine nylon gears that small being able to handle that

much
> > torque.

>
> I wondered if the oz torque rating is measured an a centimetre instead
> of an inch ? If you convert from the metric to "imperial" then they are
> out by a factor of 2.54...
>
> --
> Boo
>
>


It wouldn't make much sense to use a Metric mass measurement with an
Imperial distance, but you never know. They show 1.2kg = 40oz, which is
true for mass, but not torque. 1.2 kg-m = 1666 oz-in, which is completely
unbelievable.


Old May 22, 2003, 03:00 AM
IFly
Guest
n/a Posts
Re: Anyone try Blue Bird Servos

Well, it looks like they revised the ratings. The picture still shows 43oz,
but the text shows different numbers.

Weight: 8 Grams / 0.28 oz
Torque: 17.2 oz.in
Speed: 0.12 sec./60 at 4.8V

I was going to buy a pair to try them out, but they wont ship to Canada. Oh
well.

"john alt" <johnaltDoesntneedSpam@charter.net> wrote in message
news:vcfjgpm92615de@corp.supernews.com...
> I saw these servos over at Balsa Products. Here's a link to it:
>
> http://makeashorterlink.com/?H48B36C94
>
> Vitals:
> 8 grams
> 43 Oz torque
> .12 secs/60 deg/4.8V
> And last but not least, $14.75
>
> I thought they were too good to be true, and sent BP an email asking to
> confirm the specs, specifically the torque. They sent this:
>
> "John,
> We did not believe them either. So we measured the torque using a
> digital fish scale. The numbers were accurate."
>
> Ok, I trust BP, but I'd never heard of Blue Bird. Has anyone tried
> these? I am probably going to get a handful to play with anyway, and was
> curious about the centering, gear train strength, etc. Seems like I
> could save a lot of weight using these instead of Hitec 422 and the like
> in many apps. The 6 gram model looks nice for electrics.



Old May 23, 2003, 03:00 AM
Boo
Guest
n/a Posts
Re: Anyone try Blue Bird Servos

>>I wondered if the oz torque rating is measured an a centimetre instead
>>of an inch ? If you convert from the metric to "imperial" then they are
>>out by a factor of 2.54...

>
>
> It wouldn't make much sense to use a Metric mass measurement with an
> Imperial distance, but you never know. They show 1.2kg = 40oz, which is
> true for mass, but not torque. 1.2 kg-m = 1666 oz-in, which is completely
> unbelievable.


Well that's exactly what I meant : generally servos are quoted as kg cm
in metric form or else oz inches in imperial form. If you convert 1.2
kg to ounces you get 42 point something. So they forgot to convert the
linear dimension from cm to inches. Resulting in a torque that's
defined in oz cm ! To convert to oz inches divide by 2.54 giving 16ish.

I agree those units make no sense, must be just a slip in the conversion.


--
Boo


Old May 23, 2003, 03:00 AM
Boo
Guest
n/a Posts
Re: Anyone try Blue Bird Servos

> Well, it looks like they revised the ratings. The picture still shows 43oz,
> but the text shows different numbers.
>
> Weight: 8 Grams / 0.28 oz
> Torque: 17.2 oz.in
> Speed: 0.12 sec./60 at 4.8V
>
> I was going to buy a pair to try them out, but they wont ship to Canada. Oh
> well.


So it looks like my earlier post about a slip in the conversion factor
was right. I suppose a nearly 3-fold improvement in servo performance
over the next best micro servos was always a bit optimistic though :-)

--
Boo


Old May 23, 2003, 03:00 AM
IFly
Guest
n/a Posts
Re: Anyone try Blue Bird Servos


"Boo" <Boo@spam_me_no_spam.net> wrote in message
news:bajl4f$udr$2@news6.svr.pol.co.uk...
> > Well, it looks like they revised the ratings. The picture still shows

43oz,
> > but the text shows different numbers.
> >
> > Weight: 8 Grams / 0.28 oz
> > Torque: 17.2 oz.in
> > Speed: 0.12 sec./60 at 4.8V
> >
> > I was going to buy a pair to try them out, but they wont ship to Canada.

Oh
> > well.

>
> So it looks like my earlier post about a slip in the conversion factor
> was right. I suppose a nearly 3-fold improvement in servo performance
> over the next best micro servos was always a bit optimistic though :-)
>
> --
> Boo



Yes, I'd say you're right. I bet they sold a lot of servos before
correcting the ratings.


 


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