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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › OS105HZ-R tuning
11-04-2018 01:55 AM  9 days agoPost 1
PaulBowen

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Victoria, Australia.

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Not sure how many people run these but I have two in aircraft.

Two questions

What are your needle settings?

Am I the only one who finds these engines to be rather rough running and high in vibration?

I run mine on 23% nitro and 0.5 mid, 1 - 1.25 on main. Low is somewhere around 12 o’clock. I’ve just never really been very happy with the 105. I used to have a 50SX-H Hyper that ran smooth as silk. I also have a 32SX-H that is magnificently smooth.

Futaba T18SZ, JR Propo XG14, Hirobo fanatic!

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11-04-2018 03:28 PM  9 days agoPost 2
wjvail

rrKey Veteran

Meridian, Mississippi

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Hey Paul...

I haven't found the 1.05 to be particularly rough running. In fact, I'm pretty happy with its overall handling. I have 4 of them in different helicopters. I don't see any fuel foaming. I also haven't noticed any excess buzzing in the fins.

Lately I've been flying my Align 700XN the most. I just ran out in the garage and found the needles at:
High.. Couple of clicks more than 1 1/2 (1.65?)
Mid.. Couple of clicks less than 1/2 (.45?)
Low.. About in the middle.

These are the settings from last weekend and the weather was pretty moderate for Mississippi - i.e. not 95 deg and not 80% humidity. It was 80ish and pretty dry.

I run all my 1.05s on 30% nitro. I've experimented with head shims and my motors seem most happy with all the head shims installed. That is, (2x .2mm) + (1x .1mm) or a total of .5mm.

The 700XN noted above has a Hatory pipe. An OS #8 seems to work well and they last forever. I think the 700XN is 8.23 gearing (if I remember correctly).

"Well, Nothing bad can happen now."

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11-04-2018 09:49 PM  9 days agoPost 3
datidun

rrElite Veteran

N Ireland

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The 50 Hyper and OS 32 dont have a mid range needle,so you will have to play with the mid range, half a turn sounds very lean to me, how is the smoke sound and temperature?

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11-05-2018 11:31 AM  8 days agoPost 4
Richardmid1

rrProfessor

Leeds, England

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What rpm are you running them at? Try adding a head shim or an Enya 5 plug.

60% of the time, it works every time!

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11-05-2018 11:41 AM  8 days agoPost 5
Richardmid1

rrProfessor

Leeds, England

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https://rc.runryder.com/t752010p1/

Another Ausie running 3/4 high, 1/4 mid, so you might still be too rich.

60% of the time, it works every time!

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11-06-2018 08:50 AM  7 days agoPost 6
PaulBowen

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Victoria, Australia.

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I have a couple of shims in and the temp is ok. The smoke is pretty thick.

I’m always a bit concerned with over leaning and cooking these engines as I find them very hard to read compared to others.

Futaba T18SZ, JR Propo XG14, Hirobo fanatic!

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11-06-2018 11:52 AM  7 days agoPost 7
datidun

rrElite Veteran

N Ireland

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Actually one should only use an extra shim if using 30 percent,this will give you an idea, go on Youtube look under OS 105 tuning a guy called Dave fisher shows how to tune the 105,that should help you a bit, what are the temps like in the hover after a few minutes, what are the temps as in reading and sound like in full climb out?

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11-06-2018 01:52 PM  7 days agoPost 8
Richardmid1

rrProfessor

Leeds, England

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PaulBowen
I’m always a bit concerned with over leaning and cooking these engines as I find them very hard to read compared to others.
The extra shim will make things easier to 'read'. Yes it can lose you some power but if it makes tuning easier it can actually gain you some power and the engine will run smoother which means happier gyros!

Get used to hitting throttle hold to listen to the pipe, if it's 'hanging' (baaaar baaar baar rin tin tin tin tin!! ) it's too lean!

Remember if you fly in high heat or altitude you aren't going to get good power so don't try!

60% of the time, it works every time!

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11-06-2018 10:16 PM  6 days agoPost 9
PaulBowen

rrKey Veteran

Victoria, Australia.

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My elevation is 2000ft AMSL.

I’ve yet to have another fly as the weather has been crazy and I’ve been at work.

Futaba T18SZ, JR Propo XG14, Hirobo fanatic!

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11-12-2018 12:11 AM  1 day agoPost 10
wjvail

rrKey Veteran

Meridian, Mississippi

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I might add that I've noticed a considerable variance in needles on my 1.05s. Today I took my TSA and tried to set the needles to where the needles are set in my 700XN. Despite these helicopters being set up similar, the TSA mid and high needles need to be set 1/4 richer.

"Well, Nothing bad can happen now."

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