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Normal Topic Comet Curtiss Robin Dime Scale (Read 222 times)
uselessidiot
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Re: Comet Curtiss Robin Dime Scale
Reply #7 - May 8th, 2022 at 1:51pm
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I had some time to work on it.  I'm not about this magnifying glass life!

I'm making the wing one piece so the center section is not glued.
  

( 292 KB | 12 Downloads )
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uselessidiot
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Re: Comet Curtiss Robin Dime Scale
Reply #6 - Mar 27th, 2022 at 6:15pm
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I did not know that.  Thank you for that information.  Pretty much everything I have built to date has had the LE and TE on the same plane.  I checked and the LE and TE have pretty much zero incidence, although it does like like they have a little.
« Last Edit: Mar 28th, 2022 at 12:59pm by uselessidiot »  
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MKelly
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Re: Comet Curtiss Robin Dime Scale
Reply #5 - Mar 27th, 2022 at 10:39am
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Good start!  When looking at incidences keep in mind that the reference point is leading edge to trailing edge rather than the bottom of the rib.  Most airfoils have positive incidence when the bottom of the rib is horizontal.  If the wing, measured from forwardmost point to the center of the trailing edge, is about two degrees positive to the stab you should have a good starting point for glide trimming.

Mike
  
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uselessidiot
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Re: Comet Curtiss Robin Dime Scale
Reply #4 - Mar 26th, 2022 at 6:22pm
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Thanks, everyone.  This one has zero decalage so I added the positive wing and negative nose incidences.  I was thinking the motor peg will be a little high.  I'm trying to keep the thrust line as close to perpendicular to the nose as I can.
« Last Edit: Mar 27th, 2022 at 7:15am by uselessidiot »  
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Sky9pilot
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Re: Comet Curtiss Robin Dime Scale
Reply #3 - Mar 26th, 2022 at 1:26pm
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Ditto to what Ian and Neal have said.  I usually find myself modifying a plan to my building style. As Neal said you'll want to take care modifying the incidences.  Most of the plans have carefully calculated those things!
  

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Kerak
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Re: Comet Curtiss Robin Dime Scale
Reply #2 - Mar 26th, 2022 at 12:28pm
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Hello, hello!  More suggestions...I see in that last photo you've posted...in theory, we usually try to keep the motor thrust line more or less level with the prop button...or maybe a little above for a bit of built-in downthrust.  You might consider flipping that motor peg member to accomplish that.  Just a suggestion.  Smiley

Neal
  
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pb_guy
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Re: Comet Curtiss Robin Dime Scale
Reply #1 - Mar 26th, 2022 at 9:55am
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Looking good. I see that, like many others (myself included) you are modifying the plan as you go along. Increased wing incidence will most likely increase the amount of downthrust needed at the nose. Moving the rear rubber peg forward is a good idea.
ian
  
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uselessidiot
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Comet Curtiss Robin Dime Scale
Mar 26th, 2022 at 8:53am
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I'm starting my first dime scale.  I may have bitten off more than I can chew!
  

( 353 KB | 35 Downloads )
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( 374 KB | 49 Downloads )
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