Jackson T
Elite member
Thanks for the idea! This bird is already overweight, so no retracts on this one. Maybe I should build a V2 of my Piper Arrow sometime with retracts, nav lights and other bells and whistles!
PC 21 Scratch Build
- Thread starter Jackson T
- Start date
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- balsa fpv scratch build
speedbirdted
Legendary member
I just hadn't paid special attention to the servo mounting previously...
Jackson T
Elite member
How heavy is a set of retracts for a plane this size?
It would look a bit strange if one hadn't seen the previous post
.
Quinnyperks
Legendary member
What kind of hinges are you going to use?
leaded50
Legendary member
@Jackson T : How heavy is a set of retracts for a plane this size?
By eg. Banggood here, they have 25g retracts that would take 2kg plane. (weight on each is 25g) https://www.banggood.com/Metal-Elec...tom-alsobought__8&ID=6288619&cur_warehouse=CN
By eg. Banggood here, they have 25g retracts that would take 2kg plane. (weight on each is 25g) https://www.banggood.com/Metal-Elec...tom-alsobought__8&ID=6288619&cur_warehouse=CN
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Jackson T
Elite member
Probably tape hinges.
They look pretty good! Maybe on another build. Are they the ones you used on your T38? I just saw it in your signature and checked it out, it's awesome!
TooJung2Die
Master member
Looking good. I'll have to weigh parts before and after covering. 1/2 ounce for covering? Somehow that's more than I would've guessed.
Jackson T
Elite member
I've been trying to weigh parts before and after covering myself, and so far the red hobbyking stuff adds a bit more than 2 g/dm2 (0.66 oz/sqft), while the see-through burnt orange stuff a bit less than 2 g/dm2. That's for a double sided surface like a wing or tail surface. What covering do you use?
TooJung2Die
Master member
I use a few different types of covering. I scored a box of assorted films from someone getting out of the hobby. Most of the balsa airplanes are covered with document laminating film. No idea how much weight that adds but it's probably considered light weight. I also used Hobby King film and recently tried Solarfilm. I have a few rolls of Monokote if the right airplane comes along.
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Jackson T
Elite member
I'm curious to see how much weight those options add, could you weigh a piece before and after covering on your next project?
TooJung2Die
Master member
No problem. I never really considered the covering material adding a significant amount of weight. Now I want to find out how significant it can be.
Jackson T
Elite member
Thanks! It's useful to know how much weight it adds when designing stuff like my 4m glider.
Jackson T
Elite member
More covering!
I decided to frame around the servo arm at the tail, but I forgot to on the other side before covering. I've cut away the covering over the area, and I'm most of the way through gluing the framework in.
I glued a piece of 1/8th square balsa with cross grain (super bendy) around the contour of the rear cockpit area, then sanded it using the TLAR method. This part helps to smoothly transition the lines from the rear turtledeck to the canopy.
The full scale PC 21 has a frame thing in the middle of the canopy. To make this, I laminated 3 strips of 1/16th balsa around a corroplast former. Then, I sanded it to shape.
I haven't glued it on yet, it's just taped there. I'll glue it in after I finish covering the fuselage.
I decided to frame around the servo arm at the tail, but I forgot to on the other side before covering
. I've cut away the covering over the area, and I'm most of the way through gluing the framework in.
I glued a piece of 1/8th square balsa with cross grain (super bendy) around the contour of the rear cockpit area, then sanded it using the TLAR method. This part helps to smoothly transition the lines from the rear turtledeck to the canopy.
The full scale PC 21 has a frame thing in the middle of the canopy. To make this, I laminated 3 strips of 1/16th balsa around a corroplast former. Then, I sanded it to shape.
I haven't glued it on yet, it's just taped there. I'll glue it in after I finish covering the fuselage.
speedbirdted
Legendary member
I still don't quite understand the wing mounting. I know it goes above the bottom plate of the fuselage in the open area, but what then? A lot of lowwing planes at least that I know of have a built up wing bed where the topside of the wing goes.
How are you going to make the canopy? Vacuum former?
How are you going to make the canopy? Vacuum former?
Jackson T
Elite member
The wing mount is goofy, you'll see it when I get there. I didn't have any better ideas at the time. It should work though! Do you know of any good ideas for next time? I'm still figuring out the canopy. Stay tuned!
speedbirdted
Legendary member
I would just build the bottom part of the fuselage underneath the wing into the wing. Then, where the wing goes the fuselage is completely cut out and the fuselage can just sit onto the wing instead of the wing sliding into it.
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