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Old 07-29-2016, 11:18 AM   #11
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Re: Thunder Tiger not making good power.


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11x6 / 11x7 will work great, I do not think the prop is the problem. a .46 with a 10x6 sounds like a Honda civic with a loud exhaust, lots of noise but not going anywhere fast lol.
without the clip on the needle it may be possible the needle is vibrating out ritchening it as you fly?
Had it happen on a Magnum .46 pro was a pain!
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Old 07-29-2016, 01:44 PM   #12
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Re: Thunder Tiger not making good power.

I didn't really note the needle position after landing but I don't think it moved. I guess it's because I'm not making full power but it's not a particularly loud engine. I've heard Honda Civics that were louder. Here are the pics Cougar. In the one you can see the remaining part of the clip still on the needle and in the second I've taken it off and rested it on the needle. It's a straight needle, not angled. I've generally used Master Airscrew props. Interesting that some say a 11x7 is fine and others say it's too much prop. I'm inclined to think the former but I'm no expert. TT says 10x7. I can't see any scoring in the exhaust port. Anyway, when I get the plane ready to go again I'm going to try a 10x7. I think the engine is tired but I've definitely felt engines with less compression. Also, other than the lack of power it's been very reliable. No dead sticks. I think I'm going to order a new tachometer. Thanks.
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Old 07-29-2016, 01:50 PM   #13
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Re: Thunder Tiger not making good power.

I just looked at the specs for my old OS 46 SF and it shows props from 10.5x6 all the way up to 12x6 so perhaps 11x7 is not that big after all. Though TT does say 10x7.
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Old 07-29-2016, 01:50 PM   #14
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Re: Thunder Tiger not making good power.

11x7 is way to much prop.
Ideal prop would be an 11x6 for your ultra sport
10x7 will be faster but less vertical performance.
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Old 07-29-2016, 04:24 PM   #15
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Re: Thunder Tiger not making good power.

Quote:
Originally Posted by bugsmasher View Post
Thanks for the replies. The engine is on a old Ultra Sport 40 ARF mounted sideways. I bought it as a package on here so I have no idea how much time is on the engine. I'm guessing it's fairly high time but like I said the compression seems good. I thought it was ringed based on this.

http://stock.thundertiger.com/product/9141.html

but looking in the exhaust port it doesn't appear to have a ring. The glow plug is new as is the Byron 10% going into it. I was running about a quarter turn rich of peak. There is no drop when the external heat is taken off it and it idles great. The metal piece that goes on the needle and provides the clicks disintegrated so no clicks. Based on the questions I did discover it has an inch too much prop. It has the prop that the previous owner installed which I assumed was correct but it's not. It's a 11x7 and Thunder Tiger says 10 x7. Does an inch too much prop make a huge difference? I used to have a tachometer that would have came in handy in this instance but I somehow lost it. Do you think an inch too much damaged it? I'm going to put the proper prop on it next time but the plane needs a bunch of things fixed so I don't think I'll be flying it again for a while. Thanks

A quarter turn rich from peek is too rich, one click is better. 10X7 APC on an ultra sport will give plenty of performance.
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Old 10-26-2016, 09:13 AM   #16
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Re: Thunder Tiger not making good power.

I ran and flew the 46 again today finally with a 10x6 prop. I was getting a bit over 12 000 rpm but that was well rich of peak as the needle is definitely vibrating rich without the clip. I could hold it at peak buts as soon as I let go it moves quarter turn rich and as I fly it gets richer and richer till it dies. Cougar429 if you have a clip it definitely would be appreciated. 12 000 rpm seems low but it definitely can be leaned higher than that.
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Old 10-26-2016, 10:25 AM   #17
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Re: Thunder Tiger not making good power.

PM me your address. Pretty sure I have one I can send you.
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Old 10-26-2016, 11:22 AM   #18
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Re: Thunder Tiger not making good power.

Piece of fuel line will also work in a pinch.

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Old 10-26-2016, 01:15 PM   #19
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Re: Thunder Tiger not making good power.

Quote:
Originally Posted by williame3590 View Post
Piece of fuel line will also work in a pinch.

Bill
And will prevent any air leaks at the needle.
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