Second version of the transportable specter v2

I usually walk or take public transportation to the places I fly so I tend to have planes that can be broken down into parts, like this second build of a specter v2.

Which can be turned into this in a couple of minutes.

I wrote about the first version of this plane here on flitetest.com but soon after one of the wings broke in half in mid flight. The most likely cause seems to have been the prop of another plane hitting the wing. That shouldn't have been enough if it had been robust enough so it was probably just a matter of time until it broke even if that had not happened.

Luckly there was no damage to the other plane.

The first version after loosing the wing.

Because of the wing instability I decided to try and build another one more like the original specter: a shorter and wider wing. I added two supports instead of one and made it one step thicker (3 down to 2 layers in the front and 1 layer in the back).

Measurements used for the wing.

After the wing was finished I cut of the edges to get them straight. I then measured in 4 (maybe 5) cm from the top edge and cut them to make the wings angle forward at approximately the same angle as the original specter v2.

I used sandpaper to make the wing halfs join up as good as possible but had to add a foam board layer to make them straight when unfolded.

The top binder wasn't quite strong enough on the previous version so made it wider this time and used two screws.

I made the tail wing mounting points much more robust this time around. This improved the elevator response quite a bit (the old tail bent).

Some outside measurements.

Comparing it to a FT Cruiser I'm in the process of building. They are about equal in size. The cruiser is also built to be simple to carry. There might be a article in the future on that one if it works out good.

Stats:

Wingspan is 120 cm (47.2 inches).

AUW is 1.1 kg. 0.3 of that is the battery, a 3s 3700mah. I have a bunch of 3700mah batteries I got for my tricopter that I'd like to be able to use but it can probably be flown 10 minutes or more on a 2200mah battery so you can save about 100 grams of weight there.

The first version got 17 minutes with a 3700mah battery, haven't flown this version that long in a single flight yet.

Currently uses the 250W 1200kv motor that flitetest uses for their swappable series and a 9x4.7 prop. I've measured that it pulls around 200W with this setup and neither the 30 amp ESC nor the motor gets hot.

It flies great and is a good FPV platform. Looking forward to flying it some more.