Will an LA 46 Handle a 12x4  
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Will an LA 46 Handle a 12x4 - 7/13/2002 2:38:27 AM   
tailslide-RCU


 

Posts: 59
Joined: 5/21/2002
From: Dade City, FL,
Status: offline 		Was wondering if this is to much prop. Anyone tried it?
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Will an LA 46 Handle a 12x4 - 7/13/2002 2:56:16 AM   
f2racer



Posts: 1167
Joined: 12/7/2001
From: Bedford, MA, USA
Status: offline 		This will likely be too much prop for your engine. I've got a TT GP-42 (probably right around the same power as your 46LA), and an APC 11x4 is almost too much prop. An 11x5 is definitely too much prop. An 11x3 is perfect.

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Will an LA 46 Handle a 12x4 - 7/13/2002 3:00:35 AM   
airjeffro


 

Posts: 98
Joined: 3/24/2002
Status: offline 		Unless it is a wiz bang super thin bladed carbon fiber miracle prop then yes a 12-4 is too much prop for the La.46. I have 3 of the La.46s and by far the best prop for this engine is the Top Flight wood power point 11-4. I also like the Master Airscrew 10-6, but they are a real pain to balance.

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Will an LA 46 Handle a 12x4 - 7/13/2002 5:44:05 AM   
Foamguy


 

Posts: 150
Joined: 1/1/2002
From: Beaverton, OR,
Status: offline 		It's ported and timed perfectly for a wood 12x4.... try it on a good FF plane weighing....4 lbs or less.... and you'll love it. I have 3 of them.... and 3 .40's....its a great FF engine for us sport fliers. A hot .32 with 10x4 might win in competition for sure.... but the old LA aint too bad for most of us, assuming your model is light enough.

Foamguy

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Will an LA 46 Handle a 12x4 - 7/13/2002 6:30:33 AM   
shmo46


 

Posts: 418
Joined: 1/26/2002
From: Tucson
Status: offline 		I use the thin blade APC 12 x 4, (very similar to the popular 12.25X3.75) It works fine for me on an FX 46. Unlimited vertical on a Fun 51. pretty sure the LA 46 will handle it fine. if in doubt add a couple ounces of castor to your fuel for the extra protection.

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Will an LA 46 Handle a 12x4 - 7/13/2002 7:42:12 AM   
Chris 540



Posts: 1058
Joined: 12/3/2001
From: hampden, ME, USA
Status: offline 		Whoa there...don't think that the LA has power even close to the FX.

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Will an LA 46 Handle a 12x4 - 7/13/2002 8:59:35 AM   
Alastair



Posts: 79
Joined: 6/10/2002
From: FL
Status: offline 		I have a trainer with a .46 la on it.
I have tried it with a 10-6, 11- 4, and 11-5. The 11-5 gives the best speed and thrust. With the 11-4 it flew like it was a .40 la and the 11-5 just seems to be the right prop. A 12-4 is probably too much prop for this engine.

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Will an LA 46 Handle a 12x4 - 7/13/2002 9:21:22 AM   
tailslide-RCU


 

Posts: 59
Joined: 5/21/2002
From: Dade City, FL,
Status: offline 		thanks for the info guys

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Will an LA 46 Handle a 12x4 - 7/13/2002 12:07:06 PM   
Foamguy


 

Posts: 150
Joined: 1/1/2002
From: Beaverton, OR,
Status: offline 		Again, it depends a lot too on your airframe, drag, weight, expectations, etc. An LA is no powerhouse.... but it will deliver good torque... which is exactly what you need to swing a 12x4. As for horsepower, its in no way in the same league as an FX...... but who cares ? Theyre rock reliable, cheap, LIGHTWEIGHT, have no ball bearings to rust, easy to start, etc, etc. On a light FF plane..... meaning 4 lbs or less... a REAL FF plane.... its really hard to beat.... unless of course your one of the 3% that flies comp funfly..... Besides, if you ever manage to seize it up entirely or wear it out, at the price you can toss it and get a new one

Foamguy

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OS .46 LA - 7/13/2002 7:37:05 PM   
TorkRollN


 

Posts: 114
Joined: 11/30/2001
From: Anthem, AZ, USA
Status: offline 		I am using a OS 46 LA in a Magic.
It weighs 4 lbs without fuel RTF.
Has an APC 12.25 X 3.75 prop.

The plane can hover and torque roll all day without overheating.

I do use coolpower 30% heli fuel.
It makes a huge difference in throttle response and being able to pull out of a hover.

If I use Byron's 15% fuel it pulls out of a hover very slow, but it will do it.

It's a great engine for $65 brand spanking new.

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Will an LA 46 Handle a 12x4 - 7/13/2002 10:49:13 PM   
airjeffro


 

Posts: 98
Joined: 3/24/2002
Status: offline 		TorkRollN, Are you using a shim on the head of your La.46 to lower the compression? What muffler are you using? I have been flying light weight funfly planes under 3 lbs with my La.46s for several years, and they seem to really hammer and rattle with higher nitro fuel. As far as the 12 in props, I havn't tried the 12 in prop with high nitro. Raising nitro content in fuel has the effect of advancing the ignition timing, high nitro plus high compression equal pre-ignition (or detonation). Wouldn't using high nitro and a high load prop in a high compression engine make this worse?

I see that you are located in Pa., The NCFFA nats are Aug 3-4 in Sayre Pa., that Magic would be a great plane for the sportsman fun fly event.

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Will an LA 46 Handle a 12x4 - 7/14/2002 1:16:51 AM   
Alastair



Posts: 79
Joined: 6/10/2002
From: FL
Status: offline 		I have also used 30% heli fuel in the .46 la, but since the engine was on a trainer I didn't need the extra power. MOST engines including the la will run on 30% just fine.

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Will an LA 46 Handle a 12x4 - 7/14/2002 2:48:28 AM   
Dave McDonald



Posts: 1327
Joined: 1/4/2002
From: Eldon, MO, USA
Status: offline 		I agree with Foamguy! Your 46LA will easily turn a 12x4....but pay attention that he said a WOOD 12x4, not a nylon 12x4.

And if you want more power from your 46LA, you can always build a mousse can pipe for it. For about $25, it will provide a substantial power increase.

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Will an LA 46 Handle a 12x4 - 7/14/2002 9:47:29 AM   
tailslide-RCU


 

Posts: 59
Joined: 5/21/2002
From: Dade City, FL,
Status: offline 		You guys have been a great help. i try to use a wooden prop whenever i can. Can anyone point me to a description on how to build a mouse can muffler? any info would be great.

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Will an LA 46 Handle a 12x4 - 7/14/2002 10:18:53 AM   
Dave McDonald



Posts: 1327
Joined: 1/4/2002
From: Eldon, MO, USA
Status: offline 		For instructions on how to build a MCP, go to RC Flight Unlimited at: http://webpages.charter.net/rcfu/

Look under the CONSTRUCTION link for the Mousse Can Muffler building instructions.

For a 46LA, be sure to use the larger can specified in the instructions. 1.75" diameter and about 6.5" long works perfect!

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