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  #51  
Old 02-02-2012, 12:53 AM
Ausflyer Ausflyer is offline
 
Join Date: Jun 2008
Location: Byron Bay, NSW
Posts: 104
Default Tail light?

I have been following this thread, and wonder why little has been said about the rear limit COG. With the -12, crew ahead of the COG is unusual. Thanks Joe for your spreadsheet. I fiddled around with it, and it confirmed my expectation that with full fuel, max bags and a 155 lb pilot, no pax, the CG is right on the rear limit. Vans has nailed it again (or that's where they derived the figure - just joking!).
Perhaps that is the objective anyone fitting another type of engine needs to meet before settling on a length for the engine mount that gets the CG behind the forward limit.
Just a thought.....
Rod
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  #52  
Old 02-02-2012, 10:10 PM
FiveNinerTIM FiveNinerTIM is offline
 
Join Date: Jun 2006
Location: Canby, Oregon
Posts: 18
Default Jab 2200 W&B

Quote:
Originally Posted by kmtck View Post
Just FYI, the Jabiru2200 RV12 in the current form is "NOSE HEAVY" with a 200lb pilot and 5 gallon of fuel (CG is @ 79.9"). It takes 9 gallon of fuel in the tank to get the CG within Van's limit(between 80.49"-85.39"). The CG with 9 gallon fuel & 200 lbs pilot is 80.6".

You can run the numbers yourself(& most likely have run them) but to me the jabiru 2200 is way too nose heavy. Imagine only flying with 11 gallons of fuel(including reserve) to be safe
Please be safe!

There is mention in the KitPlanes Dec 2011 article that the Jab 2200 was located 4 inches farther forward than ideal for W&B to allow the same cowling to be used for a follow on Jab 3300 installation.

(dont mean to get thread off topic- but refers to prior response on Jab 2200 W&B)
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Canby, Oregon
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  #53  
Old 02-02-2012, 11:14 PM
Paul Walter Paul Walter is offline
 
Join Date: Jun 2010
Location: Horsham, Victoria, Australia
Posts: 83
Default

What type of enginr is a UL ?

Paul
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Rv 7A
Rv 6
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  #54  
Old 02-03-2012, 12:13 AM
rgmwa rgmwa is offline
 
Join Date: Feb 2010
Location: Perth, Western Australia
Posts: 1,647
Default

Quote:
Originally Posted by Paul Walter View Post
What type of enginr is a UL ?

Paul
http://www.ulpower.com/
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rgmwa
RV-12LR 912ULS
120346
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  #55  
Old 02-03-2012, 09:34 AM
kmtck kmtck is offline
 
Join Date: Jan 2012
Location: Dallas
Posts: 10
Default

Fiveniner, look at the pictures of teh Jabiru2200 mount and it is evident that there is definitely space for the extra two cylinders of the 3300 keeping the same distance from the firewall to the prop. To do this you will shorten the mount as Oren mentions but you are also adding another 20-30 pounds to the nose.

So what you have now is an even more nose heavy plane. The firewall is about 45" from the datum and even if you add a 25lbs weight at 40" from the datum corresponding to the 3300'd added weight the CG worsens from 78.8" for 2200 to 77.5" for 3300.

Again, to me the engine mount needs to take care of the W&B on paper first, once that is in place you calculate what your firewall can support and then once you are satisfied going back and forth with these two considerations......make the engine mount. Just my 2 cents worth!

I hope this helps as this will decide between a safe plane and a hot rod!

Rahul

Quote:
Originally Posted by FiveNinerTIM View Post
There is mention in the KitPlanes Dec 2011 article that the Jab 2200 was located 4 inches farther forward than ideal for W&B to allow the same cowling to be used for a follow on Jab 3300 installation.

(dont mean to get thread off topic- but refers to prior response on Jab 2200 W&B)
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  #56  
Old 02-05-2012, 08:06 PM
Alschief Alschief is offline
 
Join Date: Jan 2005
Location: Anderson MO
Posts: 434
Default Sensennich 64" Prop

https://picasaweb.google.com/lh/phot...eat=directlink


Just installed on 260Is
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AL & Brenda Smith
RV12, UL Power N495BA Flying
RV6 N495AB Sold
KEOS Neosho, MO
alsmith@olemac.net
alsmith@ulpower.com
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  #57  
Old 02-05-2012, 08:41 PM
splitty splitty is offline
 
Join Date: Dec 2007
Location: Hervey Bay Queensland Australia
Posts: 205
Default UL Engine

NICE...!! Hope everything is working out well!
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  #58  
Old 02-06-2012, 05:29 AM
Alschief Alschief is offline
 
Join Date: Jan 2005
Location: Anderson MO
Posts: 434
Default Engine Mount

The redesigned mount should be installed in about
10 days.
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AL & Brenda Smith
RV12, UL Power N495BA Flying
RV6 N495AB Sold
KEOS Neosho, MO
alsmith@olemac.net
alsmith@ulpower.com
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  #59  
Old 02-06-2012, 12:05 PM
kmtck kmtck is offline
 
Join Date: Jan 2012
Location: Dallas
Posts: 10
Default New mount!

Al, good to hear that the new mount will be in shortly. Good luck!
The prop looks good!

Rahul
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  #60  
Old 02-09-2012, 07:17 PM
newamiga newamiga is offline
 
Join Date: Jan 2011
Location: Barneveld, NY
Posts: 189
Default

For those who may not have seen it, EAA has a webinar just posted on the UL Power engines. Interestingly they have Sebastian Heinz on there from Zenith talking about flying the CH 650 (similar to the -12) down to Sebring with the top of the line UL Power engine in it. It sounds like he didn't have any real problems with power or speed. His fuel burn was a little higher at 75% power than the Rotax though. Anyway at least there are some real numbers and experience flying it cross country from MO to FL and back.

The video is posted here:
http://www.eaavideo.org/video.aspx?v=1443228713001
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