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Jan 26, 2019, 06:46 PM
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Build Log

Fly Bear (Fei Xiong) FX-707 "Albatross" Pitcheron conversion


INTRODUCTION

The Fly Bear (Fei Xiong) FX-707 "Albatross" is an inexpensive EPP 1.2 meter "chuck" glider.

It is one of the many "DIY" gliders that you can get from China.


WHY?

At the end of November 2018 I saw a couple of guys having far far too much fun with a pair of these at the Dave's Beach slope in Carlsbad, California.

The guys loved these things. Loved to talk about them. Loved bashing them.

I decided I had to have one too......

While mine took nearly 6 weeks to get here (long story) once things were sorted it only took about a week to arrive once they actually shipped.

As of January 2019 you can get them for under $19 shipped to the US.


REFERENCES

Scattered about are various references and blog entries about this glider.

Review:
https://www.rcgroups.com/forums/show...-1-2-meter-%29

Spaaro's Epic Journey:
https://www.rcgroups.com/forums/show...pic-Journey%21

Build Log
https://www.rcgroups.com/forums/show...bed-Conversion

Old4570 FX-760 / FX-707 comparison
https://www.rcgroups.com/forums/show...-November-2018

Electric
FX-707 (4 min 57 sec)

FX 707 (2 min 41 sec)


PITCHERON

BUT, no pitcheron conversions.

The Steeg (himself) thought (and I agree) the simplest RC conversion is to a pitcheron.

It tends to require little actual surgery on the subject glider.

I thought about this for a couple of days and came to the conclusion that the less you cut and mess with it,

the less you compromise the structure. The less you have to add weight by compensating for lost structural integrity.

It comes with a Carbon Fiber wing stiffener which will be put to good use as you will see below.

Less is more in this case.


BUILD

This thread shall serve as my build thread for an FX-707 Pitcheron.

See below for specific aspects as I go along......


DESCRIPTIONS

This FX-707 1210mm Wingspan Hand Throwing Glider is an innovative RC airplane with light weight but solid and strong structure. You can throw the glider by hand to experience different RC delight, or you can also DIY using electronic accessory to exercise ability and enjoy DIY delight. Perfect gift for kids

Features:
High performance plane with long glide time and super flexibility
Easy to assemble and reconstruction, good choice for you to enjoy DIY delight
Great gift for your children, suitable for young flyers to learn the basic concepts of flight
Perfect fuselage design with exquisite workmanship providing unprecedented flight experience
Fuselage and wing are made of environmental EPP lightweight material, super strong crash resistant ability

Specifications:
Name: Hand Throwing Glider
Model: FX-707
Material: Durable EPO
Wing Span: 1210mm
Weight: About 168g
Size: About 1210 * 830 * 160mm

Note: There could be some deviations due to manual measurement or lightly color difference as the result of shooting scene

Package Information:
Package size: 85 * 21 * 7cm / 33.46 * 8.27 * 2.76in
Package weight: 501g / 1.1lb
Gift box package

Package Included:
1 * RC Racing Airplane
1 * Sticker


MEASURED WEIGHTS

90.8 grams Fuselage (with factory nose weight)
2.8 grams factory carbon fiber wing joiner rod
11.8 grams Horizontal stab
69.2 grams Wings

174.8 grams total (minus stickers)

CG
2 inches from leading edge (by Joexer)
Last edited by r39o; Jan 28, 2019 at 04:03 PM. Reason: Added URLs
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Jan 26, 2019, 06:46 PM
Old newb
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Reserved
Jan 26, 2019, 06:47 PM
Old newb
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Reserved another
Jan 26, 2019, 06:57 PM
Old newb
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Fuselage stiffener


The fuselage towards the tail is a bit too flexible for my tastes.

It is easy to deflect it an inch.

With a CF rod inserted the deflection goes down to about 1/4 inch.

(Yes, I could have used a longer CF rod, but I did not have longer one handy, I may use a longer hollow one next time. This is all just testing......)
Last edited by r39o; Jan 26, 2019 at 08:18 PM.
Jan 26, 2019, 07:07 PM
Old newb
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Wing pivot


The FX-707 comes with a preinstalled carbon fiber spar.

It uses a CF rod as a wing joiner.

I thought and thought ... how could I make a simple pivot system?

Simple would be the CF rod and a rubber band. I have that on some other small twisty wings. Works OK. But just OK. I fear for when the bands get old or fail.

On other twisty wings I have magnets that hold the wings to the wing joiner. I have magnets small enough to fit down the tube, but it is kind of iffy to get that assembled and not have binding from glue or whatever.

After another couple of days thinking this or that, I realized a strong magnet on the outside might do it.

It does, see the picture!

I can hang the wing on the rod and it does not fall off.
Last edited by r39o; Jan 26, 2019 at 08:42 PM.
Jan 26, 2019, 07:25 PM
Registered User
Spaaro's Avatar
Rock ON, dude!
Good to see you getting down to business on these.

I haven't been able to touch my FX-706 project in more than 3weeks[..car issues..]--and its killing me!

Subscribed...
Jan 26, 2019, 07:28 PM
Registered User
Spaaro's Avatar
Quote:
"..With a CF rod inserted the deflection goes down to about 1/4 inch.."
Is that 'stiff' enough for your flying needs?
Jan 26, 2019, 08:30 PM
Old newb
Thread OP
Quote:
Originally Posted by Spaaro
Is that 'stiff' enough for your flying needs?
Unless it isn't!

We'll see.....
Jan 28, 2019, 03:09 PM
Old newb
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The meaning of Fei Xiong (FX) Fly Bear


Turns out that in Chinese Fei Xiong means Flying Bear.

Hence the name Fly Bear

Maybe I will use the below as a logo....
.
Jan 28, 2019, 03:19 PM
Old newb
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Chuck testing the Albatross


Before doing any thing else, I decided to see how the FX-707 Albatross would actually fly.

Unlike Spaaro, my Fly Bear was almost perfect out of the box.
https://www.rcgroups.com/forums/show...pic-Journey%21

All I did was bend the vertical stab a little and straighten out the wing tips (a little damaged mainly from packing or lack there of!)

I assembled her and tossed at the park.

It was perfect.

About a 15:1 glide ratio.

Now on to butchering it up.......
Jan 28, 2019, 04:15 PM
Old newb
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Center of Gravity


CG

While Joexer found the CG to be 2 inches from leading edge

I had (prematurely) stuck in a CF rod in the aft section,

finding the CG at 2.75 inches and flew fine too.....

Many off the shelf toy planes are nose heavy.

Maybe this one?

So for now, the CG is:

2 - 2.75 inches from the leading edge.
Jan 28, 2019, 07:19 PM
Old newb
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Canopy off and nose weight


Canopy is glued on.

Some more some less.

Do not yank it off!

Take a SHARP blade around the edges.

Once off, you will should notice some weight in the canopy.

I think I will put magnets in to hold the canopy later.

I have seen pictures of bolts and steel balls for weight. Mine has steel balls.

They weighed in at 43.8 grams.
.
Jan 29, 2019, 06:39 PM
Registered User
Interesting, I have the cousin, FX-709 I think waiting to be converted.
Jan 29, 2019, 08:23 PM
Old newb
Thread OP
Quote:
Originally Posted by rcsoar4fun
Interesting, I have the cousin, FX-709 I think waiting to be converted.
I can not find an FX-709

Can you share pictures or information?
Jan 29, 2019, 08:26 PM
Old newb
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Wing cut


No turning back now.......

I have a linkage system in mind, but I have to get the bits together first before I can share.


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