Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

Macchi 202

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Old 08-27-2011, 12:00 PM
  #1  
speedracerntrixie
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Default Macchi 202

I've been posting this in the scale racing forum but thought it may be of interest here too. It's a scratch built Macchi 202 designed for warbird racing. Span is 59" length 47, 550 sq wing area. Finished weight will be 6-6.25 lbs Airfoil is an RG-15 and is 10%. Power is a Rossi .61 RIRE 3+2 engine with 10mm carb and Jet Model Products pipe run internal. Engine spins an APC 10X10 prop at 16,800 on the ground. Any estimates to top speed? Ideas for better props?
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Old 08-27-2011, 12:10 PM
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Default RE: Macchi 202

Looks awesome, nice to see some "actual" building going on in this forum again!
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Old 08-28-2011, 08:55 AM
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speedracerntrixie
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Default RE: Macchi 202

Thanks RV4. I think that building is going to come back " I hope " When I started this hobby all the really cool stuff was built by a skilled guy in his garage and everyone knew how much effort went into it. Back then I always wanted a F1 plane but it just never happened. Now that I am active in racing again I can build one up and paint it as if I was doing that F1 I never had LOL. Hope this one is going to be worth 150 mph or so. The guys I race with are using the YS 4 strokes and I want to show them that the 2 strokes are still king.
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Old 08-28-2011, 04:49 PM
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Default RE: Macchi 202

I respect anyone that can dedicate that much effort and time to scratch build then have the cahones to put it in mortal danger with other raving mad speed freaks piloted war birds....I solute you!

The funny thing with that prop is that it is in a partial stall condition (slipping) when run static. Once the plane is in flight the prop "hooks" up and the engine will load down as I found with a OS 70 heli engine.

Try it anyway, but have some 10X9, 11X8 props on hand.

You must be congratulated again for pulling that much RPM with that prop. About 800 more than my heli did on 30%!
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Old 08-28-2011, 05:03 PM
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Default RE: Macchi 202


ORIGINAL: freakingfast

I respect anyone that can dedicate that much effort and time to scratch build then have the cahones to put it in mortal danger with other raving mad speed freaks piloted war birds....I solute you!

The funny thing with that prop is that it is in a partial stall condition (slipping) when run static. Once the plane is in flight the prop "hooks" up and the engine will load down as I found with a OS 70 heli engine.

Try it anyway, but have some 10X9, 11X8 props on hand.

You must be congratulated again for pulling that much RPM with that prop. About 800 more than my heli did on 30%!

Thanks again. This is the second generation Macchi that has been built around this engine. You have to see one of these torn apart to see why it makes the power it does. The sleeve is 80% ports. Very little holding the top and bottom halves together. I got about 1/2 way through the paint work today. I will post pics of the finished product in a few days.

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Old 08-31-2011, 07:08 PM
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Default RE: Macchi 202

Here she is all painted up less clear coat. Hope to have her all shiney tomorrow.
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Old 08-31-2011, 08:38 PM
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Default RE: Macchi 202

What a spectacular job!
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Old 09-01-2011, 06:42 PM
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Default RE: Macchi 202

OK all finished, just a few hours of bolting it all togethr and she is ready to fly!!!
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Old 09-01-2011, 08:19 PM
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Default RE: Macchi 202

Wow!! That is niiiiiiice!!
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Old 09-02-2011, 06:32 AM
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Default RE: Macchi 202

Nice job.
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Old 09-02-2011, 05:32 PM
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Default RE: Macchi 202

Thanks Dave, have you tried color sanding and buffing out Klass Kote clear? There are a couple dust spots I would like to take care of.
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Old 09-03-2011, 12:28 PM
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Default RE: Macchi 202

Yes I have, like you would with any auto clear.

I start with 1500, then rubbing compound, polishing compound, wax. You could probably get away with 1000 grit to start.
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Old 09-03-2011, 02:58 PM
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Default RE: Macchi 202

GO SPEED RACER GO! Yeah, I caught the "M" on the nose
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Old 09-03-2011, 03:17 PM
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Default RE: Macchi 202

Wow, that's nice. So few builders go to the trouble of paint yet it finishes the plane so much nicer. Thx for the photos. Please post more.
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Old 09-04-2011, 09:53 AM
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Default RE: Macchi 202

Thyanks guys. Coming from this group the compliments are greatly appreciated. Got the engine and all the radio gear in her over the past couple of days. Just going to spend the day checking things over and test run the engine. Maiden is going to be tomorrow morn. Can't beleive that none of the local shops have a TT 2.5" spinner. Final AUW is 6.2 lbs! Woo hoo
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Old 09-05-2011, 01:35 PM
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Default RE: Macchi 202

Got in 2 flights today. Not as fast as I was looking for but I have some things I want to try. She wasn't getting on the pipe. I think I need to get the RPMs up. I didn't have a tach out with me but it just seemed that it was being held back. I am going to try a 10X9 first to see what that does. If needed I will try increasing the exahust timing and maybe reduce the compression as I am running 15%. It was leaving a good smoke trail but was behaving like it was running hot. Any of you speedy guys have more suggestions? I have 2 weeks to get another 20-30 mph out of this airplane.
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Old 09-28-2011, 05:59 PM
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Default RE: Macchi 202

Hi Guys..

sorry to disturb, where to get the plan? or any kits avail?
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Old 09-28-2011, 07:21 PM
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Default RE: Macchi 202

Sorry but at this time no plans have been drawn. I do have molds for the canopy, front deck and cowl. If you are interested, I can draw up a simple set of plans showing fuse sides, formers, tail section and wing planform. I can supply the fiberglass parts and wing cores.
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Old 09-29-2011, 12:22 PM
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Default RE: Macchi 202

A different canopy will give ya 10 mph. you might try a 11x14 APC cut pown to a 8.5-8.75"
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Old 09-29-2011, 03:36 PM
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Default RE: Macchi 202


ORIGINAL: airraptor

A different canopy will give ya 10 mph. you might try a 11x14 APC cut pown to a 8.5-8.75"
Canopy has to stay, the rules for the warbird racing state that it has to be a replica of WW2 fighter. I'm stretching that as it is, a new canopy will most likely get the airplane dis qualified. It's running much better with a Mac's pipe in it now. Best prop at this point is an APC 10X10 cut down to 9.5". After 6 race heats last weekend I tore her down and saw evidence that I'm still running too short of a pipe. Now that the season is over I have time to bench run some mods and start with a long header and work my way in. May bump up the nitro to 25% too. It's fast but the YS 110 ans 115s still have me beat by about a full second per lap.

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Old 09-29-2011, 09:19 PM
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Default RE: Macchi 202

look at raising compression instead of nitro. What is the exhaust timing, carb size, how much blow by measured in inches does it have, what is the stroke, and how ide is the exhaust port at the top? I saw the carb size above. how is the needle senativity? is it half turn rich to lean or 2-3 clicks rich to lean?
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Old 09-30-2011, 04:28 AM
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Default RE: Macchi 202

Remember this is a Rossi, from the factory it was set up with high compression. I had to put a head shim in to keep it from popping plugs with 15%. Exh timing has been the only other change it's at 170 now. I can't go much further because we must demonstrate a 4,000 rpm idle for 10 seconds. Needle is about 1/4 turn rich to lean.
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Old 09-30-2011, 10:21 AM
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Default RE: Macchi 202

Y ou can go higher on you exhaust 180 easily. the 1/4 turn to rich lean is a bit sensitive which means the carb can be opened up more. if you had to put a head shim in to run 15% i dont think will get much more by another shim and 25%. Need to optimise the rest of the engine first. What is you exhaust port shape and width? What is the measurement from the top of the sleeve to the top of exhaust port, transfer and boost ports. Measure these first then we can see if can go higher or not on the exhaust. Did you fill the crank in the front to at least a 45 ?
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