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Scorpion Power ProModeler
HelicopterMain Discussion › HELP going HV on nitro
06-28-2017 01:34 AM  29 days agoPost 1
wifeorheli

Elite Veteran

reno, nevada usa

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So I'm going HV Servos on my nitro but don't wanna spend 200 on a throttle servo. CAN I just use a tail step down? Anyone got a link?

Novarossi Motors U.S.A
www.PlanetHobby.com
Team Align
GrandRc.com

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06-28-2017 02:44 AM  29 days agoPost 2
grimthenoble

Senior Heliman

Sunnyvale, California

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there are numerous HV servos for under $50

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06-28-2017 03:05 AM  29 days agoPost 3
spaceman spiff

Key Veteran

Tucson

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Seems to me i used a couple diodes to drop voltage once. Just solder them in series on the power line to that servo. Each junction drops voltage by 0.6 volts. I already had them sitting around so it was a free micro regulator. We have a few proper electronics guys here who would be able to expand on that.

You can't teach a crab to walk straight.

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06-28-2017 03:52 AM  29 days agoPost 4
EEngineer

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TX

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"HV Servos on my nitro "

You could use a very inexpensive servo, as was mentioned....

What voltage are your running the other servos on your nitro at?

Have to know how much voltage you want to "step down" to run a non-HV servo for your throttle....

Logo 600SXs, 700XX, 800XX

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06-28-2017 04:24 AM  29 days agoPost 5
RPM 1.5

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Cape May New Jersey

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http://www.bkservo.com
BEST SERVO'S and Excellent service and shipping

Ray

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06-28-2017 04:40 AM  29 days agoPost 6
EEngineer

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TX

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To save some time, I'll assume you plan to use a 2S Lipo battery pack to power your avionics on your nitro burner....right?

If you don't want to get a low cost HV servo to control your throttle.....OR...If you don't want to get a "step down" regulator....because of price constraints.

You can use two diodes in series to run a +5V rated servo.

Contrary to popular beliefs, a diode does NOT drop the voltage by 0.6V when the servo is drawing any operating current.....that is the voltage "band-gap" of a silicon device. The voltage required to get an electron to "jump the gap". Semiconductor physics.

Here's the spec. sheet for a 1N5404, 3A silicon diode:

https://www.vishay.com/docs/88516/1n5400.pdf

At 3A, this diode will have a forward voltage(drop) of 1.2V...less drop if the current is less.

If you don't want to make your own, use this from Amain hobbies:

https://www.amainhobbies.com/align-...nk10381a/p18532

It's made for 2S Lipos.....

But, my recommendation is to use a low-cost servo for best results.

Logo 600SXs, 700XX, 800XX

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06-28-2017 05:36 AM  29 days agoPost 7
co_rotorhead

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Centennial, CO, USA

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06-28-2017 05:53 AM  29 days agoPost 8
EEngineer

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TX

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LOL...didn't look to see if the Amain one was in stock...

Logo 600SXs, 700XX, 800XX

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06-28-2017 01:40 PM  29 days agoPost 9
wifeorheli

Elite Veteran

reno, nevada usa

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Sorry for the non info. I want to run 2s directly to my beastx. HV CYCLICS and Tail and a regular servo for throttle somewhat high speed obviously so governor works more efficiently. Don't wanna spend $180 On a throttle servo. As far as servo type is still in the air for me. I saw a combo pack of Align bl800h x3 and 1x bl850h for a good price. I know align doesn't have the best rep. For servos but I've never had a issue....

Novarossi Motors U.S.A
www.PlanetHobby.com
Team Align
GrandRc.com

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06-28-2017 02:42 PM  29 days agoPost 10
Richardmid1

rrProfessor

Leeds, England

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Futaba make the PS-01 which has an input voltage of 6-8.5v and outputs 5v.

http://www.fast-lad.co.uk/store/pro...oducts_id=18283

60% of the time, it works every time!

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06-28-2017 02:55 PM  29 days agoPost 11
wifeorheli

Elite Veteran

reno, nevada usa

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RICHARD you hit the nail on the head EXACTLY what I was looking for. I think the one at a main can't handle 8v and if it does won't step all the way down to 5. So my next question is wiring.... 2s with just a servo lead to beastx? Or....

Novarossi Motors U.S.A
www.PlanetHobby.com
Team Align
GrandRc.com

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06-28-2017 03:16 PM  29 days agoPost 12
Four Stroker

Elite Veteran

Atlanta

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I bought the Futaba PS-01 and PS-10 and tested them. The PS-01 is fine for a tail or throttle servo. It is an actual 5 volt regulator but at 1 Amp max. The PS-10 is crap. I don't know what it is. Not a regulator. Acts more like a diode. I got 4.4 volts out at 3 Amps. Now it is supposed to be a 10 Amp max 5.0 volt regulator. It was recalled and I thought OK, the new ones will work. Nope, same thing but at least they do not cut out.

I tried two diodes in series on a BLS254 servo. Drove it nuts.

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06-28-2017 03:44 PM  29 days agoPost 13
EEngineer

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TX

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The "diode trick" was used a long time ago.....used one on a Blade 450X, when I upped it's ESC's SBEC output from 5V to ^v with it's "micro-switch".

And it's tail servo was some cheap Eflite servo....it worked, but it's not the best way by far.

An HV servo is the best way to go....and for the throttle, the servo doesn't need to be one that's "radical"....just functional.

Logo 600SXs, 700XX, 800XX

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06-28-2017 05:49 PM  29 days agoPost 14
Richardmid1

rrProfessor

Leeds, England

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.So my next question is wiring.... 2s with just a servo lead to beastx? Or....
I run 2 servo leads into the Beastx. Just solder both positive and negative leads into the corresponding terminals on your chosen battery connector.

60% of the time, it works every time!

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06-28-2017 05:56 PM  29 days agoPost 15
EEngineer

Elite Veteran

TX

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Try to use two battery leads whenever possible.

Isn't there a spare BeastX port that can be used for the 2nd lead?

Logo 600SXs, 700XX, 800XX

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06-30-2017 01:34 PM  27 days agoPost 16
wifeorheli

Elite Veteran

reno, nevada usa

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DUH! I'm currently running a super bec pro c.c. and the voltage is adjustable up to 9v and 20amp and 2 leads for beastx and can run 2s or 3s to power. What u guys think?

Novarossi Motors U.S.A
www.PlanetHobby.com
Team Align
GrandRc.com

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06-30-2017 01:34 PM  27 days agoPost 17
wifeorheli

Elite Veteran

reno, nevada usa

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Put my tail servo on throttle with futaba step down

Novarossi Motors U.S.A
www.PlanetHobby.com
Team Align
GrandRc.com

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06-30-2017 10:57 PM  27 days agoPost 18
wifeorheli

Elite Veteran

reno, nevada usa

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WELL I DID IT! bought 3x bl800h and 1x bl850h servos. Now I know there the older model but I have never flown high end servos. Time to take it to the next level

Novarossi Motors U.S.A
www.PlanetHobby.com
Team Align
GrandRc.com

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06-30-2017 11:06 PM  27 days agoPost 19
EEngineer

Elite Veteran

TX

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A wise decision, imo....much much better than the diode "trick"....

Logo 600SXs, 700XX, 800XX

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HelicopterMain Discussion › HELP going HV on nitro
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