RunRyder RC
WATCH
 1 page 1370 views POST REPLY
HomeAircraftHelicopterFuel-Helicopters New or Limited ActivityAirstar › What is proper way to change Mongoose from 4 servo to 3 servo swash setup?
03-10-2012 07:04 PM  6 years agoPost 1
OneHoof

rrApprentice

Cold Spring, Kentucky

My Posts: All  Forum  Topic

They buyer of my Mongoose told me he cannot set 4 servo 90 degree swash in his Spektrum DX7 radio.

So, his friend disconnected the rear servo to receiver and took the pitch link off.

He said they hovered it around... and it controlled okay for the most part... But he didn't seem too confident.

My concern is that you have to change the position of the ball links on the swash if you change it to three.

I remember my 2nd Vario Benzin Acrobatic had 3 servo swash, but if I remember correctly the position of the balls were changed.

Do you know the proper way to set up a 3 servo swash on a Mongoose? Or is it even safe to do that?

It has the two fuel bottles on there which probably adds an extra 4 to 5 pounds of weight with 830 mm Rotortech rotors.

Myself, I would think it would be better to keep four servos on the swash and just upgrade to a more capable radio considering the size and weight of the helicopter.

What do you recommend and where can we research this information? Thanks.

Charles

PM  EMAIL  GALLERY  Attn:RR  Quote
03-10-2012 11:07 PM  6 years agoPost 2
OneHoof

rrApprentice

Cold Spring, Kentucky

My Posts: All  Forum  Topic

I am hearing 120 degree swash is ideal for 3 servos.

PM  EMAIL  GALLERY  Attn:RR  Quote
03-11-2012 08:19 PM  6 years agoPost 3
El Bucho

rrApprentice

VA

My Posts: All  Forum  Topic

You shouldn't just disconnect one of the Elevator servos and keep flying it. The Swash plate should already be drilled/tapped to put setup the balls 120 degrees apart. When you do this will have to get new link rods for between the servo and swash as they won't reach or be straight. You could try reusing the original link rods and putting in a bend to the rods are are not going in at too steep an angle.

PM  EMAIL  GALLERY  Attn:RR  Quote
03-12-2012 01:24 AM  6 years agoPost 4
AtTheCross

rrVeteran

Southern CA

My Posts: All  Forum  Topic

here are pics of my two mongoose heli's swash plates the green one is an older ASI that used a mix of Vario and ASI parts for the head, it is currently in a 4 servo 90° setup, but you can see that I can change to a 120° setup by moving the balls.

the blue swash is a newer mongoose with many more set up options for the swash set up, currently it is set up for 3 servo 120° set up

in the 90° set up the links are not perfectly in line with the end of the servo arm ball, but if I put longer arms on the servos they would line up.

in the 120° set up the links line up perfectly to the servo arm balls

ASI Green Mongoose CY29RC - 67 flights

PM  EMAIL  GALLERY  Attn:RR  Quote
03-12-2012 06:35 PM  6 years agoPost 5
clever Heli

rrNovice

So Cal, CA - USA

My Posts: All  Forum  Topic

I was looking for a photo on ASI website that shows the 120° setup but no luck. I agree with El Bucho here. So everyone can see, here is my original answer to this question that was asked in a PM.
Yes you can use 3 servo swash setup. You do need to change the position of two ball links on the swash so they are 120 degrees from each other. Two push rods will have to be modified as well. the rear push rod stays the same but the two front will need to be bent like a Z configuration. Not actually a Z but more like a S. I would see if ASI can send you photos of what one looks like. I would just upgrade to a better radio if it were me. If he's doing heavy lifting then 4 servos is a much better option. Plus 4 servos gives you a fail-safe if one servo fails. If a servo fails on a 3 servo swash setup... you can kiss that baby goodbye.

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 1370 views POST REPLY
HomeAircraftHelicopterFuel-Helicopters New or Limited ActivityAirstar › What is proper way to change Mongoose from 4 servo to 3 servo swash setup?
 Print TOPIC  Make Suggestion 

 3  Topic Subscribe

Monday, July 23 - 3:06 pm - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online