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Miniature Aircraft Nitro/Gas Helicopters > I just finished building my B/W Stratus, couple questions?
 
 
Tracy Tran
Senior Heliman
Location: Sugar Land, Texas 77478

I just finished building my BW stratus last week (Super easy built) and ready to get her in the air this weekend. I had a few questions before I break in my YS 91 SR. I've burned an OS 50 engine while broken in before so I don’t have enough confident to try it out myself this time.

How should I break in the YS 91 SR engine since it has three needle valve?

Here are my setting for needle valve to break in. are there something wrong?
Hover Needle Valve 1.75 open
High Speed Needle Valve 1.25 open
Low Speed Needle Valve 1.25 open

What temp do you run on your YS 91?

Am I installing my Hover needle valve right?




Thanks





07-23-2008 08:13 AM
 
 
hootowl
Elite Veteran
Location: Garnet Valley, Pa.

Open your high speed to 2 turns. Safer to come in rich at first.

Member Bog Troll Club #1
07-23-2008 01:43 PM
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blt4ice
Veteran
Location: Newark, DE

What I have done with my YS is as follows.

Tank 1 Stock recommendations + 3 clicks rich, ran it in on the grass with the rotor spinning enough so that the engine won't load up and stall out. I figure about between 500 and 1000 rpm.

Tank 2 Lean 1 to 2 clicks, then bring the RPMs up some more, to Just about before a Hover.

Tank 3 Lean it out a bit more so it won't die out in a hover, and bring it up into a hover.

Tank 4 same as 3

Tank 5 same as 3

Tank 6 start to dial in the engine a little at a time. maybe just 1 or 2 clicks at a time towards Lean.

Keep doing the above and get someone to help you check the engine temp so you can get an accurate reading. By the time you do get the engine dialed in right, you will probably be on tank 8 to 10 and she'll be nice and broken in for you and about 1 gallon through it. Just lots of smoke and time and it will break in fine.

Brian
Heli tools used: Torch, Pipe Wrench, 4 ft. crowbar
07-23-2008 02:25 PM
 
 
Tracy Tran
Senior Heliman
Location: Sugar Land, Texas 77478

what needle valves to use to lean it in?

Thanks
07-23-2008 04:00 PM
 
 
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Miniature Aircraft Nitro/Gas Helicopters > I just finished building my B/W Stratus, couple questions?
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