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Ballast

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Ballast

Postby Anonymous » Tue Feb 10, 2015 10:16 pm

Posted by: Joe Benjamin on 15:08:04 01/21/15 Wed

Due to substantial modifications on my J400 (LCHs, CS prop, additional generator, electric flaps, auto pilot, etc, ) I have to put 22 kg of ballast in the tail. Any suggestions as to where in the tail that ca be placed? Not in the bottom cover. That's too much and there is some ballast already in there.
Thanks

Joe Benjamin
Anonymous
 

Re: Ballast

Postby Anonymous » Tue Feb 10, 2015 10:16 pm

Posted by: Roger on 09:38:18 10/07/14 Tue

That is a lot of ballast and would it still be valid if there are 2 passengers in the back with the rear shelf fully loaded.

Better to fit a lithium iron phosphate battery, load up the rear shelf with whatever tool kit/tie downs/etc to the max allowable weight and then calculate what would be needed in the ventral fin. You never want to be aft of the cofg limits.

I like the idea of having a CS propeller.
Anonymous
 

Re: Ballast

Postby Anonymous » Tue Feb 10, 2015 10:17 pm

Posted by: Northumbrian on 19:40:56 10/11/14 Sat

Hi Joe.
Are you sure you mean 22KG. Even if the distance from tail to CG was three times that of from CG to engine that would mean you had added 66KG to the nose. I dont think that is possible even with a VP prop etc.
2.2 Kg possibly
Anonymous
 

Re: Ballast

Postby Anonymous » Tue Feb 10, 2015 10:17 pm

Posted by: Joe Benjamin on 23:47:47 01/13/15 Tue

Can't account for the total weight increase, but beside the CS prop which weights 12 kg I also have a radiator mounted on the front and the redesigned cowling from Jabiru. Also a belt driven alternator. I have weight the plane several times now and this is what I get:
LW = 167.4 kg. RW = 167.4 kg. FW = 74.3 kg
I figure I can now take only one 60 kg passenger in the back seat with a 70 kg pilot (me) and a 90 kg passenger in the front.
Anonymous
 

Re: Ballast

Postby Anonymous » Tue Feb 10, 2015 10:17 pm

Posted by: Gary on 18:34:53 01/14/15 Wed

Did you minus off the total the bits you took off the plane, prop, alternator etc.
I like the idea of the LCH, you will have to keep us posted on the performance of these
Cheers
Gary
Anonymous
 

Figures

Postby Anonymous » Tue Feb 10, 2015 10:17 pm

Posted by: Clive on 15:08:04 01/21/15 Wed

Certainly if you load the plane as you describe and with about 43 litres of fuel you will be at the MAUW. That's without any ballast.
I've sent you a spreadsheet that has a J400 and a J430 on it so you can have a play.
Regards, Clive
Anonymous
 


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