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Old Jan 02, 2013, 01:08 PM
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perttime's Avatar
Tampere, Finland
Joined Nov 2004
4,202 Posts
Just saw this thread... It reminds me of a couple of things:

Tim Hooper's Blackburn B2 that he covered with aluminium builders tape (no hot irons)
http://www.modelflying.co.uk/forums/...s.asp?th=56199
(I don't think he did a build thread here)

Macchi 72 that has the forward prop of the contraprop freewheeling:
http://www.rcgroups.com/forums/showthread.php?t=1792749
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Old Jan 02, 2013, 03:23 PM
ARFs make me BARF
mrittinger's Avatar
United States, MI, Roseville
Joined Dec 2000
8,873 Posts
I've used foil tape on quite a few birds. It repilcates bare aluminum well. On this bird, it has a highly polished, mirror finish, so no go
Saw the thread on the macchi, post a nasa link in there that shows the facts regarding freewheeling props.

Mark
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Old Jan 02, 2013, 04:00 PM
Mike Brinker
tr6world's Avatar
SouthEast Michigan
Joined May 2008
555 Posts
Fantastic job Mark. Sunglasses required to fly that bird!
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Old Jan 02, 2013, 05:54 PM
ARFs make me BARF
mrittinger's Avatar
United States, MI, Roseville
Joined Dec 2000
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Thanks, you'll be throwing it so.... lol

Score! Got the font for the lettering and numbers from none other than Thom Richard!
That will make things a LOT easier
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Old Jan 03, 2013, 06:53 PM
ARFs make me BARF
mrittinger's Avatar
United States, MI, Roseville
Joined Dec 2000
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Well it took an hour of fanagling to get the font from a PC into my ancient Mac Power PC G3, but I FINALLY got it to open and work, and it's going to make things really easy! I ahve a customer with a sign shop that said he can produce the lettering on his vinyl machine..a lot easier than cutting Monokote trim sheet!
Mark
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Old Jan 03, 2013, 09:21 PM
ARFs make me BARF
mrittinger's Avatar
United States, MI, Roseville
Joined Dec 2000
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A little more done
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Old Jan 04, 2013, 07:39 AM
Veni Vidi Volavi
Sterling, VA
Joined Jan 2002
2,493 Posts
Mark

Looking very nice!! Really going to need your sunglasses on a sunny day when PM is all done!!

Brian Allen

Veni Vidi Volavi

I came I saw I flew
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Old Jan 04, 2013, 08:21 AM
ARFs make me BARF
mrittinger's Avatar
United States, MI, Roseville
Joined Dec 2000
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Thanks. I hope the yellow znd black lettering and stripes will help!
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Old Jan 04, 2013, 09:14 AM
Mike Brinker
tr6world's Avatar
SouthEast Michigan
Joined May 2008
555 Posts
was thinking about the prop size Mark. Looking at this photo, it looks like the rear prop is smaller.... Also a nice view of how the lines are for the spinner to the fues.....
That chrome covering sure looks smooth!
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Old Jan 04, 2013, 11:08 AM
ARFs make me BARF
mrittinger's Avatar
United States, MI, Roseville
Joined Dec 2000
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Yes, the rear prop on PM is slightly smaller dia. Im seeing significantly higher amp draws on the rear prop, even with 2" different dia....
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Old Jan 04, 2013, 04:12 PM
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stuntflyr's Avatar
Los Angeles
Joined Jun 2010
1,314 Posts
The two photos above show the airplane with two different propellers. The older square clipped prop was much shorter and the difference between the front and rear lengths much greater. The new blades are a foot longer and have very little difference in length front and aft.
Chris...
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Old Jan 04, 2013, 09:28 PM
ARFs make me BARF
mrittinger's Avatar
United States, MI, Roseville
Joined Dec 2000
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There is a long discussion on FB fan page aboutt he props, and Thom has been on there a good bit.
Picking up 64 mph from last years speed has been mostly due to prop change. The largest difference is the sweept blades. Apparently it has something to do with high sub-mach numbers on the prop tips.
I found a NASA test paper that said, pretty much other than noise, there's not much of an efficiency reason to have a smaller dia second prop.
What I have found in testing is that even with a 12" front and 10" rear, the rear still pulls 5+ more amps.The paper also states a 1.1 to 5% increase in rear prop pitch to be optimal, so what I really need is a 12-8LH front, and a 10-8.5 rear ....wierd, I know!

I'll play around more with props

Mark
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Old Jan 04, 2013, 09:39 PM
ARFs make me BARF
mrittinger's Avatar
United States, MI, Roseville
Joined Dec 2000
8,873 Posts
Incidently, PM has 2,387,200 watts on 9000 lbs, or 265.44 watts/lb
I hope to have about 700 watts on 4 lbs, or about 175 watts/lb

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Old Jan 05, 2013, 11:15 PM
ARFs make me BARF
mrittinger's Avatar
United States, MI, Roseville
Joined Dec 2000
8,873 Posts
And a couple more hours on the sealing iron....
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Old Jan 06, 2013, 07:14 AM
Wanted for breaking OHM's law
Dennis Sumner's Avatar
United States, MI, Canton
Joined Sep 2002
1,570 Posts
Looks great Mark.
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