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RE: ARIXTRA Build Thread by ISAAC NAJARY - 10/28/2012 12:39 PM   
najary



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RE: ARIXTRA Build Thread by ISAAC NAJARY - 10/28/2012 5:16 PM   
stmdk



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Status: offline 		Great work Issac !!

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RE: ARIXTRA Build Thread by ISAAC NAJARY - 10/31/2012 5:03 PM   
najary



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From: Rishon le-zion, ISRAEL
Status: offline 		Saving 12 gram - (24.3-12.3), Carbon 2.5 mm

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RE: ARIXTRA Build Thread by ISAAC NAJARY - 10/31/2012 5:08 PM   
najary



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RE: ARIXTRA Build Thread by ISAAC NAJARY - 10/31/2012 10:51 PM   
nonstoprc



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Status: offline 		Cool. I like the CA method to hold the mount plate in place during the cure.

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RE: ARIXTRA Build Thread by ISAAC NAJARY - 10/31/2012 11:39 PM   
rm



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Status: online 		What kind of bit are you using to cut the carbon?  How long does it last?


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RE: ARIXTRA Build Thread by ISAAC NAJARY - 11/2/2012 7:47 AM   
najary



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ORIGINAL: rm

What kind of bit are you using to cut the carbon?  How long does it last?



Here it is: http://www.dremel.com/en-us/Accessories/Pages/ProductDetail.aspx?pid=9904

It lasts quite long.

Best regards,

Isaac Najary


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RE: ARIXTRA Build Thread by ISAAC NAJARY - 11/3/2012 7:02 PM   
najary



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Status: offline 		Here is a structure with I developed after deep thinking about the forces applied on the landing gear mount.

The all idea here is about making the landing gear mount as light as possible but still strong enough that you can be secure that in hard landing it won't broke.

It is a very frustrate feeling to brake the landing gear mount as a result to a sudden strong gust of wind especially in competition.

I have this structure in my Osmose and in my Xigris and it was proven as strong to survive over 2,000 landings with naturally some of them were pretty hard landings.

The total weight, including gluing to the fuselage and 4 screw-nuts is 30 gram (728-698).

Best regards,

Isaac Najary


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RE: ARIXTRA Build Thread by ISAAC NAJARY - 11/3/2012 7:06 PM   
najary



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RE: ARIXTRA Build Thread by ISAAC NAJARY - 11/3/2012 7:10 PM   
najary



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Status: offline 		Saving 2.6 gram (3.8-2.5)X2

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< Message edited by najary -- 11/4/2012 5:27 PM >

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RE: ARIXTRA Build Thread by ISAAC NAJARY - 11/3/2012 7:13 PM   
najary



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RE: ARIXTRA Build Thread by ISAAC NAJARY - 11/6/2012 12:13 AM   
gaRCfield



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Status: offline 		Isaac,
Thanks for your continued dedication to teaching us how to properly build/assemble these airplanes. I have a feeling you will be working on air dams and removing and installing material in the chin cowl compartment. Can you comment on any guidelines you might have, or what drives you to remove material from the areas that you do?

I have a Composite Arf Integral that I'm going to be building over the winter. I think there is some opportunity to remove material under the cowl, but having zero experience with composite planes, I am anxious about where to cut and how much to remove.

Thanks,
Joe M.

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RE: ARIXTRA Build Thread by ISAAC NAJARY - 11/7/2012 5:35 PM   
najary



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ORIGINAL: gaRCfield

Isaac,
Thanks for your continued dedication to teaching us how to properly build/assemble these airplanes. I have a feeling you will be working on air dams and removing and installing material in the chin cowl compartment. Can you comment on any guidelines you might have, or what drives you to remove material from the areas that you do?

I have a Composite Arf Integral that I'm going to be building over the winter. I think there is some opportunity to remove material under the cowl, but having zero experience with composite planes, I am anxious about where to cut and how much to remove.

Thanks,
Joe M.


Hi Joe,

I always have these guidelines on my mind:

1. About every part of the model I ask my self if it should stay the way it is or I can remove some material concerning all the forces that are applies on that part.

2. I do not underestimate any gram. Many years ago someone told me that a gram plus a gram plus a gram ... thousand times is one kilo and I never forget that.

Best regards,

Isaac Najary


< Message edited by najary -- 11/8/2012 5:36 AM >

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RE: ARIXTRA Build Thread by ISAAC NAJARY - 11/7/2012 5:46 PM   
najary



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RE: ARIXTRA Build Thread by ISAAC NAJARY - 11/7/2012 5:55 PM   
najary



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RE: ARIXTRA Build Thread by ISAAC NAJARY - 11/7/2012 5:57 PM   
najary



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RE: ARIXTRA Build Thread by ISAAC NAJARY - 11/7/2012 5:59 PM   
najary



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RE: ARIXTRA Build Thread by ISAAC NAJARY - 11/7/2012 7:18 PM   
Rune


 

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Status: offline 		Nice work Najary
how thick is the carbon plate you have made in the front??? and areyou going to have a support to the motor back?


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RE: ARIXTRA Build Thread by ISAAC NAJARY - 11/8/2012 5:31 AM   
najary



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ORIGINAL: Rune

Nice work Najary
how thick is the carbon plate you have made in the front??? and areyou going to have a support to the motor back?


Hi Rune,

It is 2.5 mm carbon plate.

It will no be a support to the motor back.

Best regards,

Isaac Najary

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RE: ARIXTRA Build Thread by ISAAC NAJARY - 11/8/2012 11:50 PM   
nonstoprc



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Status: offline 		Najary,

Wonder permanently gluing the chin cowl to the fuse is an option once the landing gear work is done. Seems that could increase the rigidity and may save some grams.

Enjoy your every building step!

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Perfection is God''''s business.

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RE: ARIXTRA Build Thread by ISAAC NAJARY - 11/9/2012 7:39 AM   
najary



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RE: ARIXTRA Build Thread by ISAAC NAJARY - 11/9/2012 7:41 AM   
najary



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Status: offline 		Saving 17 gram - (724-707)

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RE: ARIXTRA Build Thread by ISAAC NAJARY - 11/9/2012 7:46 AM   
najary



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RE: ARIXTRA Build Thread by ISAAC NAJARY - 11/9/2012 8:32 AM   
najary



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ORIGINAL: nonstoprc

Najary,

Wonder permanently gluing the chin cowl to the fuse is an option once the landing gear work is done. Seems that could increase the rigidity and may save some grams.

Enjoy your every building step!


Hi Nonstoprc,

I considered to do that in my Osmose, and decided not to, because:

1. The chin cowl is very soft and it will not increase much the rigidity.

2. It maybe saves only 2-3 grams.

3. You will no have good access to the motor, the landing gear and to the ESC.

4. The joining between the fuselage and the chin cowl will be problematic as far as the finish is concerned.

Best regards,

Isaac Najary


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RE: ARIXTRA Build Thread by ISAAC NAJARY - 11/9/2012 10:49 PM   
mwoytassek


 

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This may help in the future. I have been using a Hot Knife to cut in the fuselage just cut slow and let the blade do the work. Very clean and easy to do.

Have a good Day.

Mark

http://www.horizonhobby.com/products/soldering-iron-hot-knife-XAC73780

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