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POSTING RULES

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01-28-2012, 11:59 PM
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Join Date: Mar 2006
Location: Australia
Posts: 775
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Rahul
Jackpot - link worked for me.
Persistence pays!
John
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01-29-2012, 07:39 AM
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Join Date: Jan 2005
Location: Anderson MO
Posts: 434
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New Link to Pictures
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01-29-2012, 07:45 AM
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Join Date: Apr 2008
Location: Riley TWP MI
Posts: 3,070
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Good going AL, that link works.
Joe Gores
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01-29-2012, 07:50 AM
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Join Date: Apr 2008
Location: Riley TWP MI
Posts: 3,070
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Al Smith's Pictures:

Last edited by Mich48041 : 01-29-2012 at 07:51 AM.
Reason: Added "Al Smith's Pictures:"
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01-29-2012, 11:01 AM
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Join Date: Jul 2006
Location: Corvallis Oregon
Posts: 3,547
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I really wouldn't be putting my fuel pumps there..i.e on the hot side of the firewall sucking uphill.
This is is significantly increasing the chances of vapour lock, especially running mogas. Might be OK but why risk it?
Best to put them in the "hydralically correct location"..I.e at the low point of the system in as cold of a place as possible.
Short dissertation.. Fuel is a high vapour pressure liquid. When the suction pressure (suck of the fuel pump) exceeds the vapour pressure the fuel will boil. The pump cannot pump vapour, or at least not very well. Most suck is at max flow, i,e full throttle. Hot fuel has a higher vapou pressure than cold fuel.
In other words when you drop the hammer on a really hot day with your recently flown heat soaked engine, you might find the engine quits on take off.
Frank
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01-29-2012, 04:08 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Sincere Question
Since the advertised weight of a complete engine installation is very similar to the installed weight of a Rotax 912, why do you have the engine mounted what looks to be about 12" further fwd, than the Rotax mounts?
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01-29-2012, 04:54 PM
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Join Date: Nov 2008
Location: Gloversville, NY
Posts: 1,587
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Quote:
Originally Posted by rvbuilder2002
Since the advertised weight of a complete engine installation is very similar to the installed weight of a Rotax 912, why do you have the engine mounted what looks to be about 12" further fwd, than the Rotax mounts?
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That's what I was wondering.
Actually looks more like a foot and a half....
__________________
John Peck, CFII, A&P, EAA Tech Counselor, Flight Advisor.
?Master Pilot? Award, UFO Member.
RV-12 N37JP 120176 Flying since 2012.
One Week Wonder Build Team, OSH 2018.
VAF paid through 10/2019.
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01-29-2012, 05:04 PM
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Join Date: Jan 2005
Location: Anderson MO
Posts: 434
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Engine Mount Questions
It would seem that he Rotax may be a little heavier than the UL or Jabiru engines.
The total empty weight was 695 lbs as weighted during thw intial W&B.
The empty CG is calculated at about 80 inches with all available items less any fuel. Full fuel and one pilot we caluculate a CG at about the 82" range
We may be able to shortening the mount approximately 5"to move the CG slightly more aft, this possibility this is being considered.
We have the materials on hand.
UL Power Table of Weights for reference:
Weight of basic standard engine and accessories
Dry weight of the basic standard engine from serial production:........................60,1 kg (132,5 lb)
The total operational weight depends on the accessories installed. Typical accessories provided by
ULPower have the following weight:
Ignition Coils & leads:............................................ ................................3,0 kg (6,6 lb)
ECU & wiring loom:............................................. ..................................1,6 kg (3,5 lb)
Exhaust, bolts, springs & seals:............................................ .......................3,6 kg (8 lb)
Electric fuel pump:............................................. ..................................0,7 kg (1,6 lb)
Fuel filters (pre-filter & fine filter):.......................................... .................0.2 kg (0,4 lb)
Oil/Air Separator & hoses:............................................ ...........................0,7 kg (1,5 lb)
Rectifier Regulator:........................................ .......................................0,1 kg (0.2 lb)
Rubber engine mounts:........................................... ................................0,3 kg (0,7 lb)
Optional Oil Cooler:........................................... ......................................1 kg (2,2 lb)
2,5 L engine lubricating oil:.............................................. .......................2,2 kg (4,9 lb)
Possible fully operational engine weight: UL260i; UL260iS; UL260iF......................72,5 kg (161 lb)
Gravity valve, oil air separator and hoses:............................................ ........2,5 kg (5,5 lb)
Possible fully operational engine weight for the UL260iSA:.................................75 kg (165,3 lb)
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01-29-2012, 05:13 PM
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Join Date: Jan 2005
Location: Anderson MO
Posts: 434
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Fuel Pump Location
Quote:
Originally Posted by frankh
I really wouldn't be putting my fuel pumps there..i.e on the hot side of the firewall sucking uphill.
This is is significantly increasing the chances of vapour lock, especially running mogas. Might be OK but why risk it?
Best to put them in the "hydralically correct location"..I.e at the low point of the system in as cold of a place as possible.
Short dissertation.. Fuel is a high vapour pressure liquid. When the suction pressure (suck of the fuel pump) exceeds the vapour pressure the fuel will boil. The pump cannot pump vapour, or at least not very well. Most suck is at max flow, i,e full throttle. Hot fuel has a higher vapou pressure than cold fuel.
In other words when you drop the hammer on a really hot day with your recently flown heat soaked engine, you might find the engine quits on take off.
Frank
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THe items you mention are certainly of concern. In this configeration we are several inches away from the engine.
We plan on adding blast tubes to these items and the voltage regulatior.
We chose to minimize the expsoure to high pressue in the crew area.
Regards
AL
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01-29-2012, 05:28 PM
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Join Date: Dec 2011
Location: Meridian ID, Aspen CO, Okemos MI
Posts: 2,645
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Al - thanks for your posts
Al, I have to thank you for taking the chance and expense on the new UL engine and reporting it to us. It looks like it is going to be very competitive with the Rotex and offer a different way to go for the 12. A little competition will help with price and innovation for all airplanes - especially for the RV 12 now. Im for anything that will or could make it better. It is an Experimental airplane!
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