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HelicopterHIROBOHirobo SDX › SDX Tail Control Rod
02-15-2011 09:34 PM  6 years agoPost 1
datidun

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N Ireland

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I find the Tail Rod to be very Weak and Flexable on the sdx,i have the Ball Mounted 13.5mm on the Rudder servo,but the plastic Tube seems to flex down when moving left and right,its just so Flexi I moved up to 14mm hole but the plastic tube pipe still flexes down a bit,are they suppose to flex as much.I have the HPM version

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02-16-2011 02:53 AM  6 years agoPost 2
Bugcatcher

rrApprentice

Perth, Australia

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Hi Mate,

It is mean't to flex. Just build the heli as per the manual and everything will be fine. Hirobo know there stuff and everything is very high quality and been tested over and over again. The HPM version uses the same mounting used as the Sceadu which has been around a long time.

Just build it and go out an enjoy flying it for a long time because they last.

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02-16-2011 01:21 PM  6 years agoPost 3
datidun

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N Ireland

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Thanx Bugcatcher,i moved it up a hole to 15mm,I bought a good servo wheel Quick uk one,to get it on the 15mm hole and 90 Degrees i have to use Sub trim,which i dont want to do,I dont think its a good Idea to use Sub trim on 401 GYRO,more or less 10 to 12 percent to get 90 degrees.also to Mention if you use the 13.5mm recommended by the manual you cant get full travel on the tail pitch,even if the travel limit is set to full 140 on the 401 gyro,will have to use a hole much further away from centre of the Horn.

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02-16-2011 03:27 PM  6 years agoPost 4
datidun

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N Ireland

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OK i got it Working the way i wanted to I had to move up to the 15.5 mm Hole,Unfortunatly i Had to us 12 Percent Sub Trim to get the Horn Perfect 90 degrees,I have never had to use sub trim on rudder before,Reset the 401 so its in Neutral Position.

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02-16-2011 11:43 PM  6 years agoPost 5
Bugcatcher

rrApprentice

Perth, Australia

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Hi mate, there's nothing wrong with sub trim even on rudder. Some people dont like it but I usually have to use some sub trim on most servo's to get the arm spot on.

Also bear in mind the further you place the ball out on the arm, the more sensitive the tail will be.

Sounds like your on the right track anyway and you will be up in the air shortly.

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02-17-2011 10:03 AM  6 years agoPost 6
datidun

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N Ireland

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Great Stuff,Thanx

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02-17-2011 01:32 PM  6 years agoPost 7
Dr.Ben

rrMaster

Richmond, VA, USA

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A servo wheel versus an arm and a drill bit allow the use of no subtrim. Mark 90D for your ball and drill accordingly.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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02-17-2011 01:52 PM  6 years agoPost 8
datidun

rrKey Veteran

N Ireland

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Thanx Ben but i dont want to do that,Especially on the Quick uk alum servo horn,it has so many Threaded holes already,I only used 12 percent Sub Trim to get it 90 Degrees,if it was plastic I would have Drilled a hole,I dont think 12 percent would change much,as long as one Doesnt use any Trim what so ever,I think it should be ok,The 401 has been reset to Neutral 90 degrees,Thanx

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