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bcondrey
Joined: 03 Apr 2006
Posts: 580
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 Posted: Thu Jun 12, 2008 6:58 pm Post subject: Re: Emailing: sb08-6-1[1] |
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Kelly,
The info on 410RV is just data, not a target. It is puts the empty CGjust forward of the forward CG limit and when you add fuel/pilot you're within the envelope. As discussed many times the plane will have more trim authority during the landing phase if the CG is shifted an inch or two aft by carrying some weight in the baggage compartment. As I understand it, the decision to make the empty CG forward is because the arms for fuel, pilot, passengers and baggage are all aft of the forward CG limit.
My (N442PM) empty CG is aft of the factory plane for the following reasons:
- I have a pair of PC-680 batteries instead of the standard Concorde in the standard battery location with the second battery contactor colocated.
- I have dual LSE Plasma III ignitions which means no mags
- I have a B&C 20 amp alternator on the vacuum pad and angled oil filter adapter which adds back a little weight up front.
- I've got a pretty full panel which is heavier than the factory planes but close to the CG line.
For those wanting to do a little planning, here are the numbers:
Fwd CG limit: 107.8375" (15% of chord)
Aft CG limit: 116.2375" (30% of chord)
Fuel: 108.9"
Front seats: 114.582"
Rear seats: 151.2586"
Baggage: 173.5"
Disclaimer: Unless your plane is identical in every way to one of those mentioned, your information WILL be different. I only include it for context of the discussion on the need for trim.
Bob N442PM
(36.1 hours as of a few minutes ago!)
Is the target empty wt CG what 410RV has or something else? I believe
it has well over 1000 hours on it now, as it was over 900 last August
when I flew in it.
It would seem desirable to start planning towards whatever the goal is
from the start of the tail cone on. Wonder if
Vans will spec that bulkhead in subsequent kits for the next thickness
up. I expect I will have the same as all others when I pickup my
empenage kit, allegedly arriving tomorrow.
Kelly
Builder # yet to come.
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bcondrey
Joined: 03 Apr 2006
Posts: 580
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| Posted: Thu Jun 12, 2008 7:21 pm Post subject: Re: Emailing: sb08-6-1[1] |
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The final fix is indeed the doubler approach. When you receive your SB package it will contain a replacement chapter 10 of the construction manual with the doublers in addition to directions on how to retrofit them to a tailcone that is already constructed. Parts consist of the 2 doublers and a bag with a lot of AD4 size rivets...
I did the inspection this afternoon and found all was well. Given that I only have 36 hours on the plane and am 11 months away from the annual I'll do the 25 hour inspection routine and let the dust settle before tearing into things. Maybe somebody will come up with an easier way!
Bob N442PM
40 hour fly-off should be finished tomorrow!
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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