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Hitec RCD ProModeler
HelicopterEngines Plugs Mufflers Fuel › OS 105HZ-R issues.
PaulBowen

Veteran

East coast Australia.

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I have a brand new 105HZ-R that is running erratically lean below half throttle.

The setup/plumbing is a carbon copy of my other 105 powered heli.

The idle screw needs to be at about the 9 o'clock position otherwise it is very lean in the hover and on the ground at idle. When I pinch of the fuel it runs for at least 5 seconds which seem good. Unfortunately when I throttle down after landing the engine hangs and chirps quite strongly.

I have checked the fuel system for incorrect and leaking plumbing. I have also checked all fasteners on the engine and carburettor and also checked the check valve and regulator.

The high needle is set to 1.25 and the mid to 2.0 turns out.

Hirobo fanatic!

11-14-2016 09:44 AM
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woppini

Senior Heliman

Dublin CA

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Are you using the same pipe has your other heli? Back pressure can play a role in the engine hanging coming back down to idle.

my wifes cooking is so bad, the flies are sewing the holes in the screen door

11-14-2016 02:57 PM
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don s

Key Veteran

Chesapeake, VA

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air leak?

E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.

11-14-2016 07:36 PM
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PaulBowen

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East coast Australia.

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No detected air leaks.

I'm using a Hatori F3C muffler which has no pipe effect. My other uses a Powerboost pipe.

I'm investigating a throttle trim issue also that may be creating odd behaviour?

https://rc.runryder.com/helicopter/t813360p1/

Hirobo fanatic!

11-14-2016 09:58 PM
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don s

Key Veteran

Chesapeake, VA

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Do you use that radio with your other machines?

E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.

11-14-2016 11:05 PM
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PaulBowen

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East coast Australia.

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Just my Turbulence D3v2

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11-14-2016 11:25 PM
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don s

Key Veteran

Chesapeake, VA

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What are your Futaba support options like in that part of the world?

E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.

11-15-2016 01:41 AM
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PaulBowen

Veteran

East coast Australia.

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Quite good but our Futaba rep is originally from the JR world and uses a different setup. I have set up throttle cut now with trim as a small range idle speed adjustment now. Hopefully this makes a difference.

Hirobo fanatic!

11-15-2016 02:15 AM
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don s

Key Veteran

Chesapeake, VA

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I'm wondering if there is a fault with the radio for the throttle output to behave like that.

E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.

11-15-2016 02:26 AM
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PaulBowen

Veteran

East coast Australia.

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Not sure about a fault but certainly to me a software quirk.

I have now set the radio up using throttle cut with trim to adjust idle speed within a small range. So far this seems to be heading in the right direction with no odd interactions.

Still a little chirpy on descent.

Hirobo fanatic!

11-15-2016 10:14 AM
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Richardmid1

rrProfessor

Leeds, England

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This may not be of much help because mine isn't the regulated version but my idle screw needs to be fully open (90 degrees counterclockwise from factory setting) to idle correctly with out being too lean.

When you say it runs for 5 seconds when doing the pinch test, does the rpm increase slightly during those 5 seconds before it quits (optimum)?

Your mid does seem rich though unless you have put it there to try richen the idle? 2 turns out is roughly where the non regulated mid's are in the cold UK, the regulated ones run much leaner settings (3/4 to 1 turn out) AND it is much warmer where you are!

Also if you haven't already, try a bubble-less clunk or filter. Don't bother with foam or fiber fuel magnets, they create tiny bubbles in the fuel and cause lean running.

60% of the time, it works every time!

11-15-2016 01:46 PM
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PaulBowen

Veteran

East coast Australia.

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I may have solved the issue.

I have taken off the Hirobo 680 FRP blades weighing 180 grams each and replaced them with Rail 716 F3C blades weighing 230 grams. It seemed to me that the 680's were just not enough load for an OS 105. The extra load appears to make things way smoother and more consistent.

Time will fell I guess.

Hirobo fanatic!

11-17-2016 11:21 AM
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Richardmid1

rrProfessor

Leeds, England

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The longer heavier blades will certainly make the flight characteristics smoother and the engine will now spend more time on the high needle but how does that solve your lean idle? Or have you opened the idle screw more and solved it?

60% of the time, it works every time!

11-17-2016 11:27 AM
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PaulBowen

Veteran

East coast Australia.

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I have opened the idle needle more to about the ten o'clock position and it seems fine if not a little rich now. I believe most of my issues may have been confused by low throttle interaction with the radio.

I do remember my other 105 took a bit of time to settle in as well. It certainly became easier to tune once it had flown a bit.

Hirobo fanatic!

11-17-2016 10:01 PM
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b_s_chance

Heliman

Dayton,OH

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Have you checked the high speed needle seat? There were a batch of motors that got out a while back that had the wrong seat and needle in them. It would cause all kinds of tuneing problems across the whole bottom to top range

ama# 853742 ircha#4342 Team Synergy Team Jeti

11-23-2016 01:44 AM
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wjvail

Key Veteran

Meridian, Mississippi

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It seemed to me that the 680's were just not enough load for an OS 105. The extra load appears to make things way smoother and more consistent.
I suppose anything is possible but I have a doubt you've found your problem. People are happily flying 650's on SAB Goblin/OS 1.05s.

"Well, Nothing bad can happen now."

11-23-2016 07:50 AM
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PaulBowen

Veteran

East coast Australia.

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Very true about the 650's except that they would be running quite different gear ratios and much higher head speeds. I run typically around 1350-1450rpm. This creates much lower power loading.

The high speed needle seat is the larger variety. I own 3 150's and they all have the same needle configurations. After making some setup adjustments with the Futaba radio and a bit of further tuning the engine seems quite happy.

Hirobo fanatic!

11-23-2016 08:33 AM
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joeplumber1

Heliman

cincinnati ohio

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had the same problem with an os 105 hzr and if youre still having a problem first pull your needle and seats out get you some good brake clean not carb choke but brake clean use the little nozzle that is on the side of the can you may want to pull the carb of but not necessary put the straw from the brake clean right in the hole for the needle and squirt it do that through both holes hit oit with some compressed air put it back together it does not take much dirt to make these things almost impossible to tune ive had this problem more than once on my motors and some flying buddies motors also it always for the most part comes back to a dirty carburator

11-27-2016 11:24 PM
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HelicopterEngines Plugs Mufflers Fuel › OS 105HZ-R issues.
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