Dave & 425 GAUI

[Dave]

OK guys the search has started.
The first thing, besides the kit I need to locate are some servos and here is what I am looking at so far, tell me what you think, need some feedback.

Cyclic, Hyperion Atlas DS 20 FMD
I believe are standard in size.

www.heliflightcenter.com/HYPERION_HP_DS20FMD_ATLAS_DS_20_FMD_DIGITAL_SERVO_p/hp-ds20fmd.htm

Dave

[Doozer]

programmable, inexpensive, good servo for your flight style. Can't go wrong. You can run those @ 6V too... if you want. But you'd need a step down for your 401.

Use this database for comparing servos. Great tool.

www.servodatabase.com/


You can take any servo you want and compare it to High End or Low End servos in the same category. Just start your own comparison engine. Here's a tail servo comparison:
www.servodatabase.com/compare?servos=75,76,571,1013

Gives you a good bang for the buck comparison

[Dave]

Jun 20, 2011 19:02:17 GMT -6 Doozer said:

.........But you'd need a step down for your 401.

Lost me there Doozer, step down

Dave

[Dave]

OK Doozer
I took what you have on your 425, 3 H5000's and 1 DS3500G and the charts come out the same Maybe I am doing something wrong but it looks like I could use the DS20GMD all the way around if I wanted.

Dave

[Doozer]

Jun 20, 2011 19:49:20 GMT -6 Dave said:

OK Doozer
I took what you have on your 425, 3 H5000's and 1 DS3500G and the charts come out the same Maybe I am doing something wrong but it looks like I could use the DS20GMD all the way around if I wanted.

Dave

You could, but check out the torque:
www.servodatabase.com/compare?servos=1012,1013
... you'll need torque on the cyclic. The GMD's don't cut it for that. I think FMD's on the cyclic and a GMD tail will work.

I just checked the specs on a 401, you can run it at 6V. However, to answer your question, a step down voltage regulator is this:
helidirect.com/align-51v-twoway-stepdown-voltage-regulator-p-7099.hdx

[Dave]

Jun 20, 2011 20:47:30 GMT -6 Doozer said:

Jun 20, 2011 19:49:20 GMT -6 Dave said:

I just checked the specs on a 401, you can run it at 6V. However, to answer your question, a step down voltage regulator is this:
helidirect.com/align-51v-twoway-stepdown-voltage-regulator-p-7099.hdx

I thought maybe that was what you were talking about but I have always gone with, If you don't know for sure ask ;D

If at a later time I stretch to a 500 do you think the FMD's could handle it

Dave

[Doozer]

Sure, those would handle an 800. Metal gears, plenty of torque, cheap price.

[Doozer]

IMO this is the best standard size cyclic they have
www.servodatabase.com/servo/hyperion/ds20x-smd

But when you do the comparison I think the FMD's are a better "bang for your buck" servo:

www.servodatabase.com/compare?servos=1012,1013,1016

You pay $12 extra dollars for it to be .02 seconds faster @ 6V and have slightly less torque. It's core less, which doesn't mean a hill of beans if you aren't going to pound the crap out of it. In this case the "coreless" technology isn't providing much benefit. Being coreless usually means you'll see a faster, lighter, stronger servo. Those servos are a bit smaller dimension-wise, only a touch lighter, and really not that much faster. So I'm not sure the $12 dollars is worth it if you're just going to sport fly.

I fly these on my gasser and they're perfect:
www.servodatabase.com/servo/hyperion/ds20-umd

Those have plenty of torque. Slow as hell though, but really, I can't wrap my mind around how fast a .11 seconds difference is.

[Dave]

Jun 21, 2011 9:13:36 GMT -6 Doozer said:

......I can't wrap my mind around how fast a .11 seconds difference is.

If I remember right .11 seconds is just long enough for the OH SH&T factor to set in but not long enough to recover from it.

Dave

[Dave]

OK I am thinking at this point that these will be the servos.

3 x DS20-FMD

Basic Information
Modulation: Digital
Torque: 4.8V:194.4 oz-in (14.00 kg-cm) 6.0V:227.8 oz-in (16.40 kg-cm)
Speed: 4.8V:0.17 sec/60° 6.0V:0.13 sec/60°
Weight: 1.87 oz (53.0 g)
Dimensions:
Length: 1.57 in (39.9 mm)
Width: 0.77 in (19.6 mm)
Height: 1.49 in (37.8 mm)
Gear Type: Metal
Rotation/Support: Dual Bearings

Additional Specifications
Rotational Range: 140°

1 x Hyperion DS20-GMD

Basic Information
Modulation: Digital
Torque: 4.8V:44.4 oz-in (3.20 kg-cm)6.0V:55.5 oz-in (4.00 kg-cm)
Speed: 4.8V:0.07 sec/60° 6.0V:0.05 sec/60°
Weight: 1.73 oz (49.0 g)
Dimensions:
Length: 1.57 in (39.9 mm)
Width: 0.77 in (19.6 mm)
Height: 1.49 in (37.8 mm)
Gear Type: Metal
Rotation/Support: Dual Bearings

Additional Specifications
Rotational Range: 140°

And I get to learn something else new, both are pr :-Xgrammable

Now on to the next item on my list a motor.

Dave

[Dave]

OK Doozer provided the "Servo DataBase" link, now here is a "Motor Database"

www.progressiverc.com/Brushless_Motor.html

Not sure how current it is but it is a place to start.

Dave

[Dave]

Hey you think something like this would turn the 425/500


Scorpion HK-3026-1400

Stator Diameter ............................ 30.0 mm (1.181 in)
Stator Thickness ........................... 26.0 mm (1.024 in)
No. of Stator Arms ................................................ 12
No. of Magnet Poles .............................................. 10
Motor Wind ............................................ 6 Turn Delta
Motor Wire ..................... 24-Strand 0.25mm (30 AWG)
Motor Kv ........................................... 1400 RPM / Volt
No-Load Current (Io) ................... 3.86 Amps @ 6 volts
Motor Resistance (Rm) ............................. 0.010 Ohms
Max Continuous Current ............................... 80 Amps
Max Continuous Power .............................. 1680 Watts
Weight ....................................... 199 Grams (7.02 oz)
Outside Diameter .......................... 37.5 mm (1.476 in)
Shaft Diameter ............................. 5.00 mm (0.197 in)
Body Length ................................. 48.4 mm (1.906 in)
Overall Shaft Length ...................... 74.2 mm (2.921 in)

Dave

[Doozer]

Jun 25, 2011 9:23:49 GMT -6 Dave said:

Hey you think something like this would turn the 425/500


Scorpion HK-3026-1400

Stator Diameter ............................ 30.0 mm (1.181 in)
Stator Thickness ........................... 26.0 mm (1.024 in)
No. of Stator Arms ................................................ 12
No. of Magnet Poles .............................................. 10
Motor Wind ............................................ 6 Turn Delta
Motor Wire ..................... 24-Strand 0.25mm (30 AWG)
Motor Kv ........................................... 1400 RPM / Volt
No-Load Current (Io) ................... 3.86 Amps @ 6 volts
Motor Resistance (Rm) ............................. 0.010 Ohms
Max Continuous Current ............................... 80 Amps
Max Continuous Power .............................. 1680 Watts
Weight ....................................... 199 Grams (7.02 oz)
Outside Diameter .......................... 37.5 mm (1.476 in)
Shaft Diameter ............................. 5.00 mm (0.197 in)
Body Length ................................. 48.4 mm (1.906 in)
Overall Shaft Length ...................... 74.2 mm (2.921 in)

Dave

Sure can.

[Dave]

Another motor to consider

Helium 500 Brushless Motor 3025-1500KV 650W D:37,L:49,shaft:5

Anybody heard anything on this one.

And yet another.
AKE A.K.E ICECOLD brushless motor 500R1700TF-A 1700KV 5mm shaft
Specs

Dave

[Dave]

OK so I need to make a list of what's and where's. Dog keeps eating the paper version

Servos
3 x DS20-FMD
rcdumbthumbs.com/hyperionatlasds20fmddigitalservo.aspx

1 x Hyperion DS20-GMD
rcdumbthumbs.com/hyperionatlasds20gmdfullyprogrammabledigitaltailservo.aspx

5.1V Two-way Step-down Voltage Regulator