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BJ Craft Navigator

Old 01-31-2024, 02:18 AM
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helisax
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Question BJ Craft Navigator

I am setting up the BJcraft Navigator. Does anyone have any information on the recommended CG. I am not able to find any information on this on the net. Thanks for the information.
Old 03-09-2024, 01:44 PM
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ltc
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This is the information I received from BJ Park via email Ö
CG:

CG range of this plane is very wide. as it is most swept wing

maiden flight CG is 40mm from the back of the main wing pipe (back not center)



This is nose heavy setting for safety. it can be extended to 60mm.

find the most rear point as long as you can. ( find tail heavy setting)



The key point is the length of servo arm, within 10mm.

Longer arm shall give you tail heavy feeling but actual is nose heavy.



When 45dgr vertical and slow half roll, find CG no heading drop without control.



CD:

The effect of most swept wing, single prop no need side thrust.

Large diameter(23~24 inch) single prop need 0.5 dgr.



This plane is able to use both single and contra prop, as side thrust is zero.

If use single prop, side thrust is 0 or 0.5 dgr.

so it was zero dgr in production model.Using both propulsion has no problem.



Maiden flight incidence:

Min wing 1 dgr. full flying stab zero.



Canal incidence is -3dgr~+3dgr. little effect to flying.

Decide CG and wing incidence then as you like same as flying stab or wing.
Old 03-18-2024, 10:44 PM
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Malcolm H
 
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Hey LTC,

is he saying the length of the elevator servo arm should be 10mm? What do you use?

What CG did you end up with?

Thanks,
Malcolm
Old 03-19-2024, 07:58 AM
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ltc
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Originally Posted by Malcolm H
Hey LTC,

is he saying the length of the elevator servo arm should be 10mm? What do you use?

What CG did you end up with?

Thanks,
Malcolm
Hi
sorry my plane is still in the crate so I canít offer anything else
however, Iím sure if you email BJ directly he will respond
Use the address master at BJCraft dot com
Old 03-19-2024, 08:39 AM
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Malcolm H
 
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Thank you.

Hope you get your plane built soon!

Old 04-06-2024, 05:24 AM
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kevarc
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Hello,
I have the Navigator and am just starting the build. This is the first build of this type for me. Lots of experience with standard wood kits but nothing.like this.
Really the big difference for me is mounting the motor.
I a using the dualsky CRS3000 contra system.
I cannot use the rubber isolation mounts they provided because there isn't enough room to get a firewall in and have a gap for the spinner.
After going over it with my local building mentor (Thanks Dan) I will hard mount it.
I will also be beefing up the landing gear mount per some BJ Build threads.

The only issue with the kit at this point is I just discovered on aileron is badly warped, is has a big bow in it. Not sure how to straighten it out without tearing the covering off.
I have reached out to see if I can get a replacement.

Thanks for posting the info from BJ!
My elevator horn is more like 50mm from the elevator to the hole.

All in all cant wait to get it in the air!

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