Today's Message Index:
----------------------
1. 02:04 AM - engine choices (louis buckley)
2. 03:41 AM - ANOTHER broken exhaust tube (Thom Riddle)
3. 09:16 PM - Re: engine choices (Underwood, James)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
--> Allegro-List message posted by: louis buckley <lbuckley122@comcast.net>
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
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | ANOTHER broken exhaust tube |
--> Allegro-List message posted by: Thom Riddle <jtriddle@adelphia.net>
This pertains to the older (not stainless steel) exhaust system on the
Allegro 2000 w/ 912 series engines.
The #3 exhaust tube broke near the upper weld at the bottom of the
elbow a bit below the EGT thermocouple, in less than 50 hours after
replacing this part due to it happening before. We welded up this break
and it happened again in less than 50 hours. We decided to support this
side of the heavy muffler to reduce or eliminate the vibrations that
were leading to this endemic failure. Less than 10 hour after that, the
#4 exhaust tube broke in the identical place. It appears that the
stresses we relieved by better supporting the #3 side moved to the #4
side. Law of Unintended Consequences is alive and well.
This is obviously a faulty design or more likely wrong use of materials
which succumb to vibrations too easily. The welder that did the repairs
said he had never welded this type of steel before and suspects it was
some sort of spring steel which he had never seen used in an exhaust
system before.
Fortunately, as most of you who have bought newer Allegros know, a
newer stainless steel exhaust system is not standard on the Allegro.
After having replaced both landing gear legs we had hoped to avoid
having to replace the exhaust system too but we have no choice at this
point.
I hope that the stainless steel system will solve this problem. Have
any of you had this sort of problem with the stainless steel system?
Thom in Buffalo
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
--> Allegro-List message posted by: "Underwood, James" <JUnderwood@BBandT.com>
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
-----Original Message-----
[mailto:owner-allegro-list-server@matronics.com] On Behalf Of louis buckley
Sent: Tuesday, June 20, 2006 5:04 AM
--> Allegro-List message posted by: louis buckley
--> <lbuckley122@comcast.net>
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
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|