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Cox Engine of The Month
Wood removal
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Levent Suberk- Diamond Member
- Posts : 1200
Join date : 2017-12-24
Location : Turkey
Re: Wood removal
I inspired from Jim's message


Levent Suberk- Diamond Member
- Posts : 1200
Join date : 2017-12-24
Location : Turkey
Re: Wood removal
Interesting. Who would have thought? .....have to be a VERY sharp potato peeler! And how do you sharpen one of those things?
OhBee- Platinum Member
- Posts : 664
Join date : 2016-03-23
Age : 70
Location : Minnesota
Re: Wood removal
I used an old potato peeler. It shaves balsa very easily. Unserrated blades gives better result, I think.
Blades can be sharpened with sandpaper stick.
Blades can be sharpened with sandpaper stick.
Last edited by Levent Suberk on Sun Nov 01, 2020 3:11 pm; edited 1 time in total
Levent Suberk- Diamond Member
- Posts : 1200
Join date : 2017-12-24
Location : Turkey
Re: Wood removal
Greenie for Levent for showcasing a potato peeler. I need to steal the kitchen one and replace it now. I never thought to sharpen one, let alone use it as a balsa tool! Something else to keep in mind...if the cutting edge of the blade is at an angle to the travel of the blade, then it cuts easier. In other words, hold the tool at an angle to the stroke. Consider this is how the guillotine was improved...the chop became more of a slice.
Please excuse the cartoon image. I hope it shows well enough that the travel of the pushrod needs to be tangent to the arc described by the control horn. Typically the pushrod travel is parallel to the tail surfaces. In fact, the pushrod travel doesn't need to be parallel to the control surfaces, just as long as the travel is tangental to the control horn arc. Taken to the extreme, the pushrod could be at a right angle to the elevator, and as long as the pushrod action is centered on the tangent, the elevator swing remains the same.
If I have described it well enough, then consider that the un-even swing, or arc of travel of the control horn end can be manipulated to create an imbalance of travel such that the elevator can actually move more in one direction than the other. I have used that in the past to give more "up" than "down" such that pulling up creates an agressive up, and pulling down is less aggressive. This is good for getting away from the dirt (or concrete), making tighter inside loops than outside loops, but then creating a softness when pulling out of the bottom of loops, or the apogee of a climb and dive.


Please excuse the cartoon image. I hope it shows well enough that the travel of the pushrod needs to be tangent to the arc described by the control horn. Typically the pushrod travel is parallel to the tail surfaces. In fact, the pushrod travel doesn't need to be parallel to the control surfaces, just as long as the travel is tangental to the control horn arc. Taken to the extreme, the pushrod could be at a right angle to the elevator, and as long as the pushrod action is centered on the tangent, the elevator swing remains the same.
If I have described it well enough, then consider that the un-even swing, or arc of travel of the control horn end can be manipulated to create an imbalance of travel such that the elevator can actually move more in one direction than the other. I have used that in the past to give more "up" than "down" such that pulling up creates an agressive up, and pulling down is less aggressive. This is good for getting away from the dirt (or concrete), making tighter inside loops than outside loops, but then creating a softness when pulling out of the bottom of loops, or the apogee of a climb and dive.



Last edited by 944_Jim on Sun Nov 01, 2020 10:13 pm; edited 1 time in total
944_Jim- Platinum Member
Posts : 1097
Join date : 2017-02-08
Age : 56
Location : NE MS
Re: Wood removal
Alrighty then!....finally got this leading edge down to where now it just needs final fitting to slot in fuselage. Only managed to crack 2 ribs in the process. Their awfully flimsy! I won't be building another wing like this! After a solid week of all day at the bench,I'm becoming tired of the whole project!
OhBee- Platinum Member
- Posts : 664
Join date : 2016-03-23
Age : 70
Location : Minnesota
OhBee- Platinum Member
- Posts : 664
Join date : 2016-03-23
Age : 70
Location : Minnesota
Re: Wood removal
Great job, OhBee,
That sure is cute looking. Any chance you traced parts so it can be replicated? I look forward to seeing the completed model.
That sure is cute looking. Any chance you traced parts so it can be replicated? I look forward to seeing the completed model.
944_Jim- Platinum Member
Posts : 1097
Join date : 2017-02-08
Age : 56
Location : NE MS
Re: Wood removal
Traced parts?...ha! ...got the plans,and the sheets the ribs were popped out of. Not much to it really! It's been a bit taxing though for some one who built thier last plane in 1967! I don't know whos gonna cover the wings though.....way above my pay grade! Was thinking about just sheeting them...but I went ahead and already sheeted the center bottom....so that's out now.
OhBee- Platinum Member
- Posts : 664
Join date : 2016-03-23
Age : 70
Location : Minnesota
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