royjp(at)yahoo.ca
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 Posted: Sat Aug 23, 2008 6:17 pm Post subject: Rép E : Zenith701801-List: 701 6 the Jab3300 |
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Hope flicka500 reads it this time !
Jean-Paul Roy
--- En date de : Sam, 23.8.08, James Sagerser <lvuman(at)gmail.com> a écrit :
| Quote: | De: James Sagerser <lvuman(at)gmail.com>
Objet: 701 & the Jab3300
À: zenith701801-list(at)matronics.com
Date: samedi 23 Août 2008, 22 h 00
This might be a good time to jump in here as there seems to be a lot of
discussion as to whether the Jabiru 3300 is an adequate engine for the 701.
I have the first or close to the first 701 with a Jabiru 3300. It was the prototype plane used by Pete at JabiruUSA to fit a firewall forward package using the 701. A proven 601 cowling was modified for the purpose and more recently was modified again to address cooling issues. Although the original cowling worked well at temperatures below 75 degrees, cooling issues, specifically CHT's, were too high while climbing for any length of time. I finally reglassed the cowling and the cooling ducts to allow 40% more inlet air and opened the bottom of the cowling to allow the correct differential pressure. The modification worked wonderfully. I no longer have any cooling issues although I haven't flown "Buzz" in temps greater than 95 degrees. I believe Pete at JabiruUSA has since modified his firewall forward package to change his cowling and inlet ducts to approximate my installation. Should be great.
I tried several different propellers (thanks to the helpful staff at JabUSA) and have found the correct combination for me. In this process, Pete sent me a 68" prop which I loved but it was tested with the original cowling and the temps were even slightly higher due to flatness of the blades close the inlet openings. Would be fun to try it now with the improved cowling but am very satisfied with my 64" prop. I can't remember the correct pitch, etc, but can supply that information when I get back to Arizona.
The performance has been very acceptable, however it's hard to judge the difference in a Rotax powered 701 as I have never owned or flown a Rotax powered 701. I've owned and flew a 701 with a Jab 2200 for about 70 hours and Buzz for about 65 hours. Additionally, Buzz has been modified with PegaStol wings (retractable slats), extended gear, etc., making it slightly heavy although the wing installation increased my gross weight to 1,200lbs. It does get off very quickly and climbs with two people at about 1,000' per minute. Works for me.
I really like the 3300 Jab engine. I also liked the 2200. I think the 2200 powered 701 got of the ground as fast or shorter than the 3300 but Buzz is at least 100 lbs heavier. I would have used another 2200 but the climb was only about 400 ft pre/min and needed more for Alaska and Colorado. Jabs start smoothly and easily, and most of all, hardly any vibration in cruise (3300). I cruise at about 85 with less than 4 gallons per/hour at about 2500RPM but can easily push it up to 100 if I want to pay for the gas. With the new hydraulic lifters, there is very little maintenance, single carb (which is a big plus), and easy to do maintenance if needed.
I removed the wings and stored it in my garage while I went to Alaska and Colorado for the summer. I plan to put the wings back on shortly and hopefully, fly it to the Copperstate Fly-in in Arizona the last part of October. See: http://www.copperstate.org/
Hope this answers a few of the questions. For those of you interested, I have a few pictures posted at: http://www.flickr.com/photos/22918119(at)N08/
James Sagerser
Chandler, Arizona
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Découvrez les photos les plus intéressantes du jour! [quote][b]
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