Wright Stuff C

[Nesh]

Yeah.

[klastyioer]

Yeah.

so you know the rules state that the wing has to be less than or equal to 35 cm in length and 7 cm in width
so start there try to get relatively close to those measurements
then take the surface area of the wing and start at around 25% of that to equal the surface area of the stabilizer
this year the wing is really small so you can get away with a huge tail
but start there and make a ton of stabilizers
see where you can get with that
once youre all good to go, experiment with motor stick tail boom prop and motor sizes

[CrayolaCrayon]

Yeah.

Have you tried building a Freedom Flight kit? Those are very competitive and meet all specs if built correctly.

[SluffAndRuff]

I'm almost done building the Freedom Flight kit but I'm struggling to understand one part of the instructions. When you use the dime to "warp the Left Trailing Edge downward about 1/8'" what exactly is the warpage measured against? The right trailing edge? The left leading edge? The left trailing edge at the tip against the trailing edge at the center? I had understood it as the former, and when you use the dime again for the horizontal stab, it says "3/16' lower on the left tip than the right tip", but how would this be interpreted when the left tip should be 1/2" above the right tip? Thanks!

[CrayolaCrayon]

I'm almost done building the Freedom Flight kit but I'm struggling to understand one part of the instructions. When you use the dime to "warp the Left Trailing Edge downward about 1/8'" what exactly is the warpage measured against? The right trailing edge? The left leading edge? The left trailing edge at the tip against the trailing edge at the center? I had understood it as the former, and when you use the dime again for the horizontal stab, it says "3/16' lower on the left tip than the right tip", but how would this be interpreted when the left tip should be 1/2" above the right tip? Thanks!

I'm thinking in comparison to the right wing and right stab; he does this for keeping the wings level, so I'd assume that it's the left in comparison to the right? I could be very wrong; I'd wait for a response from BJT.

[klastyioer]

I'm almost done building the Freedom Flight kit but I'm struggling to understand one part of the instructions. When you use the dime to "warp the Left Trailing Edge downward about 1/8'" what exactly is the warpage measured against? The right trailing edge? The left leading edge? The left trailing edge at the tip against the trailing edge at the center? I had understood it as the former, and when you use the dime again for the horizontal stab, it says "3/16' lower on the left tip than the right tip", but how would this be interpreted when the left tip should be 1/2" above the right tip? Thanks!

I'm thinking in comparison to the right wing and right stab; he does this for keeping the wings level, so I'd assume that it's the left in comparison to the right? I could be very wrong; I'd wait for a response from BJT.

Honestly I'm thinking its compared to if the trailing edges were straight or at a 180 degree angle to the ground. so if you were to warp it 1/8" (which you could eyeball if you already know how to warp planes) down towards the ground, itd be compared to if the wing were at 180 degrees to the ground. i would also wait for an expert to reply to your question, but if its a bit more urgent than i would think it is, i would just try your best to eyeball the warp compared to an imaginary straight trailing edge. ill pm you what it should look like.

[bjt4888]

SluffandRuff,

The left wing panel trailing edge is warped down 1/8" relative to the left wing panel leading edge. See the picture in the Freedom Flight instructions on page 12.

This is called "washin", which increases the lift generated by the left wing to prevent excessive roll.

The stabilizer gets this same type of washin setting, but 3/16" instead of 1/8", and the washin is set into the stab after the 1/2" stab tilt. You'll see in the instructions that the left tip of the stab is propped with scrap balsa so that the stab has the 1/2" tilt (LE and TE evenly 1/2" higher than the LE and TE of the tip of the right stab panel) and then only the leading edge stab joint is glued to the stab mount and the diagonal carbon strut is glued in. After these glue joints are dry and set (maybe 15 minutes to be safe), the dime is added to the left stab panel trailing edge to create the 3/16" washin and the stab TE and TE carbon diagonal are glued in the same manner as the wing.

The stab washin is probably also part of the design to control roll as the "tandem" wing/stab design has a tendency to dutch roll. Look up the equations related to dutch roll; pretty interesting math. Are you doing Fourier Series math yet?

Brian T.

[bjt4888]

Klast,

Good job explaining. Warp in reference to the ground is another way to look at this question. In your example, the wing leading edge would be parallel to the ground and the TE tip would be angled down towards the ground.

Brian T.

[klastyioer]

Klast,

Good job explaining. Warp in reference to the ground is another way to look at this question. In your example, the wing leading edge would be parallel to the ground and the TE tip would be angled down towards the ground.

Brian T.

lol thanks! here i found a part of a source from soinc and drew it out if its still confusing for anyone
https://sketch.io/render/sk-fd0c45afd86 ... 5d5e5.jpeg

[Rossyspsce]

Anyone know if the Ikara props that come with the FF kit are flaring or not?
Also, where to buy or how to make flaring props?

-Rós