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  #21  
Old 03-10-2012, 01:45 PM
SteinAir SteinAir is offline
 
Join Date: Feb 2005
Location: Minneapolis
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Quote:
Originally Posted by delusional View Post
I might be "speaking" out of turn here, never having built one, but taking a historical perspective, could I modify the op to "12v or 24v yet?" The number of items unavailable 28v shrinks daily, and tso'd converters are readily available. No, I doubt you would save much weight on cables, but in some cases you might be able to get away with a smaller alternator, which, even given the converter and associated wiring could save a little weight.

And consider this; just as those with 28v eventually want something 12v, those with 12v might find some day they want some gadget that needs, or prefers, 28v, in which case, it's easier to go down than up. You can get a converter for either, but check the prices, size and weight.
Listen to those who are giving you the advice and just move on from the 28V thought process for an RV9. It's a waste of usefull time to continue thinking about it when you could be building instead!

Roee's list is only a start. I could go on and on, but again it's a waste of perfectly good time to discuss it for an RV9 so just trust these folks already.

Cheers,
stein
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  #22  
Old 03-10-2012, 03:29 PM
N941WR's Avatar
N941WR N941WR is offline
 
Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by SteinAir View Post
Listen to those who are giving you the advice and just move on from the 28V thought process for an RV9. It's a waste of usefull time to continue thinking about it when you could be building instead!

Roee's list is only a start. I could go on and on, but again it's a waste of perfectly good time to discuss it for an RV9 so just trust these folks already.

Cheers,
stein
Good advice. Look up SteinAir, if you don't already know who he is.

Keep this bit of advice in mind whenever you think of deviating from the plans, "There is thousands of RV's flying in the stock configuration for a reason."

While going down your own path is fun and has its own rewards, bushwhacking usually adds a lot of time and money to any project.
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RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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  #23  
Old 03-11-2012, 04:15 PM
delusional delusional is offline
 
Join Date: Oct 2008
Location: Boston area
Posts: 128
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Bill, thanks for your thoughtful and detailed response. Okay, you sold me. The toughest hurdle seems to be the flap motor (though, I suppose that is optional), servos and heated aoa probes seem tricky, too.

Regarding availability of reasonably-priced devices, just from supplier web sites:

I see no real difference with regard to lights. Anyone starting a project today is going to use LED lights if they have any sense and those are pretty voltage agnostic.

Battery is no big difference; two smaller batteries will do just as well, possibly better, and weigh the same. Little more money, I guess.

Relays, heated pitot and pumps; no problem unless you want one from Vans.


So a couple key items and the ability to use unanticipated, non-aviation type devices is the real difference.

I predict the gap continues to narrow....
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RV9: tail complete
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  #24  
Old 03-11-2012, 05:11 PM
paul mosher
 
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Default A/C Voltage

Why not just use A/C? Boeing likes it.
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