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What's a stock .46 turn a 9x10, and/or 9x7 APC props?

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What's a stock .46 turn a 9x10, and/or 9x7 APC props?

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Old 11-21-2002, 04:18 AM
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rsieminski
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Default What's a stock .46 turn a 9x10, and/or 9x7 APC props?

I did some mods to a TH .46 and I get 16.3K with the 9x7, and 13,7K with the 9x10. I forgot to tach it before the mods, so I don't know if I gained anything. This is with 3%nitro, 18% oil(50-50). What will a .46 stock set up turn them at? I'm looking for all out speed on a 4lb model.
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Old 11-21-2002, 06:38 AM
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Default What's a stock .46 turn a 9x10, and/or 9x7 APC props?

I run an OS .46FX on a World Models T-34 with an APC 9.5x7 prop using Powermaster YS 20/20 (20% Nitro with 20% all synthetic oil) with the muffler baffle removed and I get over 16,000rpm.
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Old 11-22-2002, 12:58 AM
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Default What's a stock .46 turn a 9x10, and/or 9x7 APC props?

TT 46pro,9/7apc, Ultrathrust muffler, 17,200rpm 125mph
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Old 11-22-2002, 04:16 AM
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Default What's a stock .46 turn a 9x10, and/or 9x7 APC props?

Cyclic Hardover, and maverick, those are awesome #'s for those set-ups.
I tached it with different props tonight, and here's what I got:
9x10 APC 13.65K
10x8 MA 14.5K
12.25x3.75 APC 12.4K
11x5 MA 16.1K
9x7 APC 16.6K
14x6 MA 7K --> just for kicks
All using 5%N, 18%O(50/50) instead of the 3% for a little more needle lee way.

Are they better than avg?
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Old 11-22-2002, 04:02 PM
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Default What's a stock .46 turn a 9x10, and/or 9x7 APC props?

Originally posted by rsieminski
9x7 APC 16.6K
There you go! The APC 9.5x7 prop I am using is a pylon racing prop.
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Old 11-22-2002, 04:47 PM
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Default stock 46

16.6k sounds pretty good on a 9x7, especially on 5%. I would expect the stock TH to turn 500 to 1000 rpms less than what it could with a Perf. Spec. pipe. Yours and Cy's numbers suggest that the TH and TT are close in power.

What is your 4 lb model? Depending on the airframe, there may be a better prop than a 9x7 for all out speed.

Paul
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Old 11-25-2002, 03:09 AM
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Default What's a stock .46 turn a 9x10, and/or 9x7 APC props?

Here's a couple of pics of the incomplete airframe, awaiting engine and radio gear:


48" triple tapered ws, 36" fuse, AUW wet should be just under 4lbs
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Old 11-28-2002, 04:51 PM
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Default You gotta be kidding

You're Gonna fly a coroplast plane that fast?

Video it, we wanna watch it shed!!!!!!

Ramjet
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Old 11-28-2002, 05:31 PM
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Default What's a stock .46 turn a 9x10, and/or 9x7 APC props?

Shed? What do you mean? I have a smaller one that was clocked @ 126mph with an OX 32 SX-H. I'm just concerned about flutter. Here's a pic of it, all dusty:


Here's another one, over 100mph, but flutters at WOT, with a Mag .40:

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Old 11-28-2002, 10:17 PM
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Default Exactly

Thats just what I mean; Flutter, flap, Riiiip, gone!

Several guys here fly coroplast jobs, but no-one is into real speed with them.
And they flutter already unless modified from the plans somewhat!

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Old 11-29-2002, 03:53 AM
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Default What's a stock .46 turn a 9x10, and/or 9x7 APC props?

Nothing I've ever built has been to any plans. I see what works, and go with it. But, I've never had one fall apart in the air, that might be something balsa planes do, but not coro. The flutter, if severe enough, will bank toward the wing with the flutter, but never fall apart. I'm sure in a dive, the little red one is well into the 130's, and no flutter.
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