Originally Posted by lucdus

super light !!

Thanks ! It's in normal limit.

I finally found why the third fuselage flies so well, thanks to the new device !

CG = 92 mm ! ( in the manufacturer's manual it is recommended CG = 87 - 90 mm ).

very interesting ...

thanks.

Originally Posted by lucdus

very interesting ...
thanks.

Thanks too, Jean Luc, to watch my posts.

And a little demo. Second flight of "Introduction F5J" with third fuselage, was launced at 35.9 m, and glide for 91.6 seconds. Resulting sink rate 0.3919 m/s.
Second day, I have a flight of 12.38 minutes, launced at 146 m.

Because I setup CG on the fly field, balancing glider in the hand, and feel that the CG is far rear from previous ones, and feel good seeing how good fly,
Always wanted to check out CG. But it took some time before I managed to build a new one CG scale.

Now is very clear: CG = 92 mm.

excellent results ...

based on your tests i have noted to rear my CG and make tests during next flights at spring.

With my multiplex balance i am used to verify my CG and i will make some additional marks for test in the model.
I use a spirit level when using the multiplex balance.
Eventhought the precision is certainly less than your machine, what counts in fact is measure consistency / repetitiveness and deviation of CG, step by step.

Your tests are key information, thanks

I received carbon fiber tube: 1m, 26 grams. I think to make a fuselage mix of balsa, plywood and carbon tube. Next year .

I have checked weight before covering: 101 grams.

Cover with oralight transparent white (10).

Little operations . I forget to make an additional hole for cooling. I forget to check if wing fit on this fuselage.

It would have been good to do them before the covering.

Now all that is do. I checked if fuselage is right with help of carbon tube . Ready to glue direction.

I have broken two fuselage until now . I think that is time to design my own fuselage for Introduction F5J. In general will be same, but tail will be a carbon tube.

After some days of thinking how to do that, today I make first piece. Will be a long way, because all pieces will be done manually .

The plan would be this. I will adjust as I go to get the best result.

excellent research on carbon tube integration

Regarding wood working may I suggest you 2 tools that are wonderful and extremely useful ?

1/ is a "bocfil " (copying saw ) and 2/ is a "jeweler cheville"

the bocfill is so helpful to saw wood in very direction
the "cheville" is extremely handy to cut wood, i did mine some years ago, it is a mythic jeweler tool that you can manufacture easily and will last for life
if you are interested i can send you a photo of mine

bonnes fetes ...

Originally Posted by lucdus

Regarding wood working may I suggest you 2 tools that are wonderful and extremely useful ?
1/ is a "bocfil " (copying saw ) and 2/ is a "jeweler cheville"

Thanks Jean Luc ! Good advise.

But I prefer my power tools when possible. Here it was about copying a part very exactly, and then I prefer to do it manually with hand tools, especially for the prototype.

One more piece. For now, I make them from 3 mm abaci. In the end I will make them from 3 mm plywood. These two pieces are essential for good alignment of the carbon tube.

A big step for new fuselage ...

nice long work ... and in this case the dremel copying saw is the right tool

A challenge is to make nose block R22.

nice work, congratulations ...