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06-28-2015 04:47 PM  4 years ago
Topic Vote0Post 1
joshmoha

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midland texas

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Os 105
I have another ? About my engine. It came with an extra head gasket to add if I were using 15% or higher nitro and I am do you need to gasket? And would a 91 pipe work I have a spare? Save me $279. Thanks
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06-28-2015 05:00 PM  4 years ago
dchekas

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Farmington, CT

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Running 15%, simply run the shim that came installed in the engine.Team Align, Team Futaba, Team Byron Fuels, Team Thunder Power
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06-28-2015 10:31 PM  4 years ago
joshmoha

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midland texas

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I run 30% should I add the extra shim?
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06-28-2015 10:51 PM  4 years ago
Aaron29

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USA

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What do the instructions say?
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06-28-2015 10:51 PM  4 years ago
Dan Minick

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Columbus, WI

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Yes add the thinner extra. One thick, one thin for 30%
You can try two thick but I have found it unnecessary
Team Synergy, Team FBL Rotors-------if its not broke...it will be!
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06-29-2015 12:30 AM  4 years ago
joshmoha

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midland texas

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Ok thanks. Dose anyone know if I can use my is 91 pipe on my os105?
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06-29-2015 12:56 AM  4 years ago
Glenn Goodlett

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California

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I've been running my 105 on just the stock shim with 30% for a long time. It will be easier to tune by adding additional shimming but at the cost of power.

You will likely loose power by running the .91 pipe on a 105 but I cannot say I've ever tried it.
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06-29-2015 02:25 AM  4 years ago
Aaron29

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USA

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I looked up the manual to answer my question. Couldn't find an answer. Sort of annoying that there is so much an esoteric art to nitro. If I can't go to the manual to get the info...

So O.S. puts shims in there and never even tells you what to do with it?!

Someone correct me if this is in the manual. As I couldn't find.
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06-29-2015 02:34 AM  4 years ago
don s

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Chesapeake, VA

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Page 11: "90 size silencers can also be used"
Page 17: "About the head gasket"
Page 46: Shows Powerboost 90 as an accessory.

(The velocity stack is also mentioned on pgs. 11 and 17, but that's OT.)
E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.
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06-29-2015 02:38 AM  4 years ago
Aaron29

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USA

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I see that, but it doesn't go very far past mentioning it.

So vague. Says go with "either the 0.1 or the 0.2."

Hahah OK and how is your user supposed to know when 0.1 is good vs. 0.2. It's a start. But like I said. Esoteric knowledge. The manuals ought to be a LOT better.
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06-29-2015 02:41 AM  4 years ago
Aaron29

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USA

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And don I know we're OT but now that I look at it, there's an argument that the velocity stack is a "standard accessory" and is perhaps optional by the "accessory" definition. So you could be right.

Again, very little good advice from the manufacturer.

Wait, WHAT?! "Standard Accessory?!"

WTF is that? Is it standard equipment or is it an included accessory? WTH is a standard accessory? This is literally an oxymoron. A shameful juxtaposition of terms into one incoherent idea. LOL I could not be more confused!

So scratch it all. I'll not make the mistake of turning another OS user to their manual for advice. OS should be ashamed for that "manual."

LOL!
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06-29-2015 03:19 AM  4 years ago
don s

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Chesapeake, VA

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I could do with just a parts diagram and needle settings. The rest equals dead trees. E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.
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06-29-2015 03:25 AM  4 years ago
Aaron29

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USA

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Only because of your experience. If you were a newbie you'd say "thanks for nothing!"
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06-29-2015 04:24 AM  4 years ago
joshmoha

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midland texas

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Thanks again for all the advice.
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06-29-2015 04:25 AM  4 years ago
Aaron29

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USA

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What's the plan?
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06-30-2015 01:15 AM  4 years ago
joshmoha

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midland texas

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Add gasket use 91 exhaust and vel. Stack
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06-30-2015 11:10 AM  4 years ago
wjvail

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Meridian, Mississippi

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Add gasket use 91 exhaust and vel. Stack
That is a wonderful plan.

What is the elevation in Midland - and don't say the same as Odessa. I assume that is where you fly.

Bill
"Well, nothing bad can happen now."
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07-01-2015 01:40 AM  4 years ago
joshmoha

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midland texas

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3 feet higher. How do you know about Odessa? It is on the news a lot
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07-04-2015 09:57 AM  4 years ago
wjvail

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Meridian, Mississippi

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What is the elevation in Midland - and don't say the same as Odessa.
3 feet higher. How do you know about Odessa? It is on the news a lot
No. Not on the news a lot.

In a past life I flew A-4s for the Navy. I stopped there once for fuel going from southern California to Mississippi and broke down there for a week. It's a long sad story. Anyway, with a week to kill while the airplane was being fixed, I got to explore the entire Midland Odessa metroplex.

For those that don't know, Midland and Odessa are about 20 miles apart and the airport sits just about 1/2 between them. The two cities are in the Permian Basin in West Texas and it is flat. Texas flat. I found it entertaining to note that while the two cities are a little over 20 miles apart, you can see each other from the city you're in. It's not as if the two cities are sitting on small hills with a valley between them. It's just flat and you can look down I-20 for 20+ miles and see the next city.

More on topic. I did a Google and found that Midland Odessa is at about 2,900 feet and it's often HOT this time of year. The combination of high temperatures and elevation suggest you might want to run your 1.05 with just the one, thinner, shim. The more restrictive .90 muffler will not likely hurt your performance very much either. You're just not going to pump a lot of air at 3,000 feet and 100 deg F.

If you're just hovering 15% nitro will be fine. If you want more performance you will benefit from more nitro. Think of more nitro as a liquid supercharger. It brings more oxygen to the combustion process and in your flying conditions, that would be helpful.

When I was in Midland it was bitter cold. Two things - you might want to run the thicker shim in these conditions and if it's as cold and windy as when I "visited", you might want to find another hobby for the winter.

https://en.wikipedia.org/wiki/Density_altitude

Cheers,

Bill
"Well, nothing bad can happen now."
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