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LouB
Joined: 10 Jan 2006
Posts: 14
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 Posted: Tue Jun 20, 2006 1:04 am Post subject: engine choices |
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With the allegro rather low VNE of 137, which is the best choice in
engines ... the 80 or the 100 hp Rotax? If you were building a kit
version would anyone consider the Jabiru series of engines. The 2200 is
essentially the same weight as the Rotax. Of course , the cowling looks
tight on the Rotax and making the Jabiru work might be quite painful.
What do you all think. In those with experience is the 80 hp Rotax
perfect or do you wish you had gone with the 100 hp in retrospect.
Thanks,
Lou
CT, USA
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JUnderwood(at)bbandt.com
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| Posted: Tue Jun 20, 2006 8:16 pm Post subject: engine choices |
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I actually picked the 100HP Rotax for mine, and have no regrets at the
moment. I would like to be able to put 87 octane in the tank, but 93 is
still cheaper than AvGas. The power is nice with the 100. Take off's happen
before you know it, even with a big passenger. I've heard that servicing the
Jabiru's are harder, but I can't say that from experience. I like my 100.
Cruise around at 4300 to 4400 RPM at a little over 100MPH. Flew about 150
miles Sunday, and used about 5 gallons of fuel, in 1 1/2 hours. Not too bad.
Jim Underwood
919-761-4323
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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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| Posted: Wed Jun 21, 2006 3:07 am Post subject: engine choices |
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Lou,
When we bought our Allegro, I specifically wanted the 80 hp Rotax 912
engine, for the following reasons:
- Low compression engine requires only 87 octane autogas - ~20-30 cents
/ gallon cheaper than 91+ octane
- 4 gallons per hour consumption at 75% power vs. 5 gph for the 100 hp
version
- Still cruises as fast as a Cessna 152
- About 6 1/2 lb. lighter installed weight
- Solo at standard conditions it gets 1100 fpm climb rate with the prop
pitched for best cruise.
- Climbs better than a Cessna 152 at full gross with prop pitched for
best cruise.
- Can operate from 1,000' grass field in this part of the country.
- ~$2,000 remains in your pocket - enough to pay for transponder and
other goodies.
At the current price of $3.12/ gallon of 87 octane vs. $2.87/gallon
for 93 octane and 5 gph vs 4 gph, the fuel cost per hour at 75% cruise
power is 35% higher (over $4/hour) for about 8-9 mph extra speed. Not
worth it in my book, especially since we spend most of our flying hours
at 55-65% power, sight seeing.
Thom in Buffalo
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_________________
Thom Riddle
Buffalo, NY (9G0)
Don't worry about old age... it doesn't last very long.
- Anonymous |
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Bob Griffin
Joined: 22 Jan 2006
Posts: 34
Location: Slingerlands,NY
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| Posted: Wed Jun 21, 2006 3:12 am Post subject: engine choices |
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Hi Lou, I have flown 5 Allegros in NC and our demo plane. Some 80 and others
100 hp. The 80 hp performs very well. I would consider the 100 hp if towing or
putting floats on it.
Bob Griffin
upstate NY
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Fly Safe
Bob Griffin
Slingerlands, NY |
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