Tag Archives: scratchbuilt

Scratch Builds

Have not been posting here in a while, weather is changing and not as many opportunities to fly, so don’t do as much building when I cant maiden (crash) the creations.

Here are a few over the last few weeks:

My rendition of the Balsa Plan called the wot4 or watt4. Scaled the drawing down to 45%. High wing but fully symmetrical so wanted to see what it can do. No rudder servo, 1540kv motor, 7×5 prop.

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FrankenPlane: Wings are from a smashed Katana, elevator from a smashed Bravado, fuse and tail hot cut foam. Powered by a 36series 1500kv motor, should be interesting to see if it will fly!

2016-10-28-11-30-38

 

 

Profile plane, modelled after the electrifly 300 – this flew very well!

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The Pitt-Tastic….

Ok, so I started with the plans from an old balsa FSW called the spintastic…. It was forward swept with a profile fuse and a rudder. This is an exceptionally odd design so thought I would try it.

However, once I had the wing built I noticed an old HK pitts biplane that I had badly smashed many months ago…

It had a partly intact fuse, no wings, busted elevator, and crushed motor shaft, and really should have just been scrapped.

Being over tired, using this pitts with the spintastic wing seemed like an awesome idea!

Sooo, I cut the fuse apart to take the FSW at midpoint, repaired the motor mount, elevator etc, and glued it all together!

I really need to stop building planes late at night!

Building the wing from 2″ pink insulation:

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Gluing it all into one and using packing tape rather than laminate:

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Mini Gremlin #2

Since both the full size and mini Gremlins fly like a dream, I could not leave well enough alone and decided to build a very slightly different one.

For this one, I increased the wing span to 34″, and used symmetrical airfoils from the corsair build, hot cutting them to have a slight upturn at the TE of the outside airfoil.¬† Supposedly this helps a wing design offset the natural tendency to track downward….
This slight upturn is only 1/2″ and is difficult to see from the photos, but does give the span of the wing a slightly different angle tip to tip.

And of course, speed is always an issue! The earlier mini gremlin uses a 1400kv motor, and while quite respectable, I’m curious what kind of control I would have with a faster gremlin.
So, this build has a 2200kv motor, swinging a 7×5 prop…..

2016-05-22 18.42.00 2016-05-22 18.41.16 2016-05-22 18.41.30

 

LAR Twin Bruiser

I have many motors from the quad days, and decided to build something to see if I can make use of some of them. To start, I have used the original DJI 950kv motors that were used from 8″ to 10″ 2016-05-07 20.02.01 2016-05-10 19.25.38 2016-05-10 19.25.50 2016-05-10 19.26.07Started with a hot cut wing, 48″ in length, but only a cord of 8″.

Noticed the ft cruiser is close to what I want for body and wing look, so borrowing heavily from that design.

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LAR Plank

Continuing with the flat plank style, here is a design with a fully symmetrical airfoil, and the LE cut at each corner to prevent tip stall.

Apparently the winglets are not required with the this cut, however, decided to play it safe.

Running an 1100kv motor and an 11″ prop, this design flies like a dream.

*Update – got caught in some wind, drove the plank into a building… this is No More!

 

2016-05-05 17.06.36

Corsair Profile

The gull wing design is interesting, but I have no clue as to what advantage it is supposed to provide…

That said, thought why not scratch build one!. Here¬† is a 46″ wing, built a jig to cut the angles with a hot wire, using the LAR principle, so don’t know what the actually degrees are.

Since this was a build that came together with no real thought, the awful paint job is appropriate.

Powered by a Park 450, a 9×6 prop and a 40a esc, the maiden should be interesting…..

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LAR #4 Slo Wing

The Krazie Wing from an earlier build remains an interest, and since I had an armin style wing, with a slight dihedral, thought it may be worth the time to see if the krazie wing principle could transfer to this type of airfoil.

Powered by a sunnysky 750 spinning a 13×8 prop, it seem to have enough thrust to reach the moon! I’m using CG from the previous wing, however this feels extremely nose heavy. Will see if survives its first test flight!

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2016-04-23 17.41.28

 

Small Wing

Based on the FT designed $tree foamboard wing, this is a close design but built from Gray Depron, cover in laminate for strength, with no spars. Running a 3200 kv emax.

Flys extremely well! One thing I am learning with these wings is that elevens need a slight positive up angle, not coplanar with the wing. However, that in turn drives the craft up when under full throttle. To get around that, a normal mix should be created that drives elevens down when over 50% throttle is reached.

 

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LAR #2 Krazie Wing

Seen the new TH Crazie Wing coming out in later this year, so took measurements from the pictures to try and duplicate.

2016-04-12 18.45.28

White styro hotwired and covered with laminate film, 1100kv with 10×4.5 prop and a 3s2200 brings the wing to as close as I can calculate. CG is VERY sensitive, so will be interesting to see if this can fly before destruction!

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