Today's Message Index:
----------------------
1. 12:27 AM - Re: Re: Pulsar weights and engine choices. (Keith Palmer)
2. 12:51 AM - Re: Pulsar weights and engine choices. (mjb777)
3. 12:54 AM - Re: Re: Pulsar weights and engine choices. (Brian Anderson)
4. 01:20 AM - Re: Re: Pulsar weights and engine choices. (Keith Palmer)
5. 01:55 AM - Re: Re: Pulsar weights and engine choices. (Keith Palmer)
6. 03:16 AM - Re: Pulsar weights and engine choices. (mjb777)
7. 07:52 AM - Re: Re: Pulsar weights and engine choices. (GREGSMI@aol.com)
8. 10:34 AM - Re: Re: Pulsar weights and engine choices. (GREGSMI@aol.com)
9. 02:58 PM - Oshkosh and voltage regulator (sonja.englert@juno.com)
10. 11:24 PM - Re: Pulsar weights and engine choices. (mjb777)
Message 1
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| Subject: | Re: Pulsar weights and engine choices. |
Matt,
Personally with what you want to do you must speak to the designer
to get approval or get yourself a mechanical engineer to do the calculations
for you, and in either case do load tests after construction to get approval
from your local authorities, before registration, as a new design aircraft.
This is what would be required in my country.
You can't expect homebuilders and pilots to answer these questions .
Keith
PS there are two types of wood spars 1 st the capping did not go to the end
of the spar - 2nd upgrade capping went to the end of the spar/wing tip
----- Original Message -----
From: "mjb777" <mattbrock777@gmail.com>
Sent: Wednesday, August 15, 2012 8:47 AM
Subject: Pulsar-List: Re: Pulsar weights and engine choices.
>
> Thanks for all the input so far guys I really appreciate it.
>
> I'd be very interested to learn more about the structural failure of the
> BMW conversion. I believe it was a landing incident and who knows what
> sort of strut type engine mount, or fuselage anchor points had been
> 'engineered'. If anyone has pictures or a website link that would be
> great.
>
> Can someone explain to me why, if the weight of the hypothetical Aerovee
> converted Pulsar at +4g is LESS than the 582 configuration at +6g, then
> why is there disaster looming with the wood spars?
>
> MTOW limits in this class of aircraft are only for the design limit G and
> safety factor after all.
>
> My spars have the Bi caps and I am aware that there are XP's out there
> with the spruce spar at 960lb WITH A +6g LIMIT AT THIS WEIGHT.
>
> So if I carry out a suitable strengthening of the forward fuselage to
> carry and distribute the extra loads at +4g with a factor of 2, (about
> 150lbs) ...........whats the problem?
>
> I know I am playing devils advocate here but the History books are loaded
> with stuff that we 'couldn't do'!! [Wink]
>
> Matt.
>
> --------
> Pulsar 1 Kit.
> Captain B777.
> Licenced Aircraft Maintenance Engineer.
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=380945#380945
>
>
>
Message 2
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| Subject: | Re: Pulsar weights and engine choices. |
Thanks Keith,
I fully intend to do as much analysis of this as I can and fortunately the SAAA
has engineers on hand to assist with this sort of thing. I pretty much want to
hear opinions, and will not hold anyone responsible for such.
My kit has the full length reinforced spars.
I know there are at least a couple of Pulsar 1's out there with the Jabiru conversion
and I'd really like to hear from some of those guys about their experience
so far?
Matt.
--------
Pulsar 1 TD Kit.
Captain B777.
Licenced Aircraft Maintenance Engineer.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=380948#380948
Message 3
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| Subject: | Re: Pulsar weights and engine choices. |
Matt,
There are other considerations anyhow. The VW is a lot wider. How are you going
to keep it within the dimensions of the cowling. The present cowling will only
just fit a Rotax 912. How are you going to strengthen the firewall to distribute
the loads into the fuselage? The Series 1 and the XP were designed with the
engine bed mounted. The loads are carried into the fuselage via unidirectional
glass "beams" through the firewall and into the fuselage structure. The firewall
itself is only 1/4" glass/foam sandwich, strengthened to carry the noseleg
loads.
How are you going to maintain the correct CofG location with that much extra weight
in the nose ?
Why bother trying to re-engineer it for something that it was never designed for.
Brian
XP, #456, 912
On 15/08/2012, at 6:47 PM, mjb777 wrote:
>
> Thanks for all the input so far guys I really appreciate it.
>
> I'd be very interested to learn more about the structural failure of the BMW
conversion. I believe it was a landing incident and who knows what sort of strut
type engine mount, or fuselage anchor points had been 'engineered'. If anyone
has pictures or a website link that would be great.
>
> Can someone explain to me why, if the weight of the hypothetical Aerovee converted
Pulsar at +4g is LESS than the 582 configuration at +6g, then why is there
disaster looming with the wood spars?
>
> MTOW limits in this class of aircraft are only for the design limit G and safety
factor after all.
>
> My spars have the Bi caps and I am aware that there are XP's out there with the
spruce spar at 960lb WITH A +6g LIMIT AT THIS WEIGHT.
>
> So if I carry out a suitable strengthening of the forward fuselage to carry and
distribute the extra loads at +4g with a factor of 2, (about 150lbs) ...........whats
the problem?
>
> I know I am playing devils advocate here but the History books are loaded with
stuff that we 'couldn't do'!! [Wink]
>
> Matt.
>
> --------
> Pulsar 1 Kit.
> Captain B777.
> Licenced Aircraft Maintenance Engineer.
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=380945#380945
>
>
>
>
>
>
>
>
>
>
Message 4
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| Subject: | Re: Pulsar weights and engine choices. |
Opinion are meaningless unless from a qualified person - and for a "Captain
B777. - Licenced Aircraft Maintenance Engineer" asking these questions of
Homebuilders and Pilots ????. I would say you are on your own !
----- Original Message -----
From: "mjb777" <mattbrock777@gmail.com>
Sent: Wednesday, August 15, 2012 9:51 AM
Subject: Pulsar-List: Re: Pulsar weights and engine choices.
>
> Thanks Keith,
>
> I fully intend to do as much analysis of this as I can and fortunately the
> SAAA has engineers on hand to assist with this sort of thing. I pretty
> much want to hear opinions, and will not hold anyone responsible for such.
>
> My kit has the full length reinforced spars.
>
> I know there are at least a couple of Pulsar 1's out there with the Jabiru
> conversion and I'd really like to hear from some of those guys about their
> experience so far?
>
> Matt.
>
> --------
> Pulsar 1 TD Kit.
> Captain B777.
> Licenced Aircraft Maintenance Engineer.
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=380948#380948
>
>
>
Message 5
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| Subject: | Re: Pulsar weights and engine choices. |
BTW your last comment - the Jabiru is an approved conversion all specs and
drawings are available from the agents.
----- Original Message -----
From: "Keith Palmer" <kdpalmer@mweb.co.za>
Sent: Wednesday, August 15, 2012 10:20 AM
Subject: Re: Pulsar-List: Re: Pulsar weights and engine choices.
>
> Opinion are meaningless unless from a qualified person - and for a
> "Captain B777. - Licenced Aircraft Maintenance Engineer" asking these
> questions of Homebuilders and Pilots ????. I would say you are on your
> own !
>
> ----- Original Message -----
> From: "mjb777" <mattbrock777@gmail.com>
> To: <pulsar-list@matronics.com>
> Sent: Wednesday, August 15, 2012 9:51 AM
> Subject: Pulsar-List: Re: Pulsar weights and engine choices.
>
>
>>
>> Thanks Keith,
>>
>> I fully intend to do as much analysis of this as I can and fortunately
>> the SAAA has engineers on hand to assist with this sort of thing. I
>> pretty much want to hear opinions, and will not hold anyone responsible
>> for such.
>>
>> My kit has the full length reinforced spars.
>>
>> I know there are at least a couple of Pulsar 1's out there with the
>> Jabiru conversion and I'd really like to hear from some of those guys
>> about their experience so far?
>>
>> Matt.
>>
>> --------
>> Pulsar 1 TD Kit.
>> Captain B777.
>> Licenced Aircraft Maintenance Engineer.
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=380948#380948
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>
Message 6
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| Subject: | Re: Pulsar weights and engine choices. |
I appreciate all input that you guys have given me regarding this matter.
I don't see how my qualifications mean anything when I am simply seeking information
from those with experience in this area and also with similar modifications
that have been made in the past.
If anyone has more information they'd like to provide regarding Jabiru or Rotax
conversions that they know of with wood spar Pulsars, I'd really like to hear
from you.
Matt.
--------
Pulsar 1 TD Kit.
Captain B777.
Licenced Aircraft Maintenance Engineer.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=380952#380952
Message 7
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| Subject: | Re: Pulsar weights and engine choices. |
Matt, with the kit came a set of manuals. If they are the correct manuals
for that kit, hard to say after 20 years, but those manuals will give the
kit's design limitations.You must know that designing an aircraft is a series
of compromises, each change impacting other things. It is extremely
complicated. I have worked five years on a design project with a very gifted
design engineer and you would be amazed at the 'do overs' a minor change has
caused.
The Pulsar builders and pilots have an outstanding safety record and we
tend to guard it jealously. We love the aircraft and the people that fly them.
Most of us had the luxury of consulting with the aircraft designer while
we were building. If we screwed up or wanted to deviate from plan, we could
call the factory and the designer would evaluate the issue based on the
impact to the whole aircraft design. Unfortunately, this great support is no
longer available.
As several people have pointed out, you need to be talking to an engineer
that has all of the specifications and testing that went into the design,
and that is not available. If you cannot build the plane per the manuals then
I would like to suggest you donate it to someone that will follow the
manual. You paid nothing for it so you are out nothing. Maybe you could sell it
and buy the aircraft that is designed for your requirements.
Please do not be offended by this suggestion. We have lost some Pulsar
friends and our biggest concern is for all to be safe. You are wanting to
modify the Pulsar way beyond it's design limitations and there is no way that
can be done on this forum.
Greg
In a message dated 8/15/2012 5:17:09 A.M. Central Daylight Time,
mattbrock777@gmail.com writes:
--> Pulsar-List message posted by: "mjb777" <mattbrock777@gmail.com>
I appreciate all input that you guys have given me regarding this matter.
I don't see how my qualifications mean anything when I am simply seeking
information from those with experience in this area and also with similar
modifications that have been made in the past.
If anyone has more information they'd like to provide regarding Jabiru or
Rotax conversions that they know of with wood spar Pulsars, I'd really like
to hear from you.
Matt.
--------
Pulsar 1 TD Kit.
Captain B777.
Licenced Aircraft Maintenance Engineer.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=380952#380952
Message 8
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| Subject: | Re: Pulsar weights and engine choices. |
Just one more answer for your calculations. The 6 G load you are looking at
is ULTIMATE load, the point where the spar fails. FAR 23 requires a 1.5
safety factor which puts the operating limit load at 4 G. By reducing the
ultimate load to 4 G, you now have an operating limit load of 2 G, not a safe
situation. I hope that clarifies things for you.
Greg
In a message dated 8/15/2012 9:52:41 A.M. Central Daylight Time,
GREGSMI@aol.com writes:
Matt, with the kit came a set of manuals. If they are the correct manuals
for that kit, hard to say after 20 years, but those manuals will give the
kit's design limitations.You must know that designing an aircraft is a series
of compromises, each change impacting other things. It is extremely
complicated. I have worked five years on a design project with a very gifted
design engineer and you would be amazed at the 'do overs' a minor change has
caused.
The Pulsar builders and pilots have an outstanding safety record and we
tend to guard it jealously. We love the aircraft and the people that fly them.
Most of us had the luxury of consulting with the aircraft designer while
we were building. If we screwed up or wanted to deviate from plan, we could
call the factory and the designer would evaluate the issue based on the
impact to the whole aircraft design. Unfortunately, this great support is no
longer available.
As several people have pointed out, you need to be talking to an engineer
that has all of the specifications and testing that went into the design,
and that is not available. If you cannot build the plane per the manuals then
I would like to suggest you donate it to someone that will follow the
manual. You paid nothing for it so you are out nothing. Maybe you could sell it
and buy the aircraft that is designed for your requirements.
Please do not be offended by this suggestion. We have lost some Pulsar
friends and our biggest concern is for all to be safe. You are wanting to
modify the Pulsar way beyond it's design limitations and there is no way that
can be done on this forum.
Greg
In a message dated 8/15/2012 5:17:09 A.M. Central Daylight Time,
mattbrock777@gmail.com writes:
--> Pulsar-List message posted by: "mjb777" <mattbrock777@gmail.com>
I appreciate all input that you guys have given me regarding this matter.
I don't see how my qualifications mean anything when I am simply seeking
information from those with experience in this area and also with similar
modifications that have been made in the past.
If anyone has more information they'd like to provide regarding Jabiru or
Rotax conversions that they know of with wood spar Pulsars, I'd really like
to hear from you.
Matt.
--------
Pulsar 1 TD Kit.
Captain B777.
Licenced Aircraft Maintenance Engineer.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=380952#380952
(http://www.matronics.com/Navigator?Pulsar-List)
(http://www.matronics.com/contribution)
Message 9
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| Subject: | Oshkosh and voltage regulator |
Hello All,
I had solved my temporary overvoltage problem by installing a new voltage regulator.
I did not buy the one Rotax specifies but am now using one used on John
Deere tractors. It cost less than half of the original one and works better. I
have had it in the plane during the Oshkosh trip and it is holding up well. If
anyone needs info on it, I can send a picture and where I bought it from. Unfortunately
it is sold under a number of different part numbers. It has a different
bolt pattern but it was easy to make a simple adapter.
Instead of writing an Osh trip report, I made a video. I have added the links to
my videos to my web site
http://www.caro-engineering.com on the "Video" page.
Please note that I have a new email address: paqs345@gmail.com
Sonja
____________________________________________________________
Woman is 53 But Looks 25
Mom reveals 1 simple wrinkle trick that has angered doctors...
http://thirdpartyoffers.juno.com/TGL3131/502c1b5966a1b1b591607st04duc
Message 10
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| Subject: | Re: Pulsar weights and engine choices. |
Thanks for your insight Greg and I very much appreciate the following and pride
of the Pulsar guys out there. I haven't heard a bad word about the aeroplane
other than some of the negative experiences that guys have had with 2 strokes
over time.
A quick question with your last comment. I have numerous official Aero Designs
pulications that state the "G-Limits (Tested) +6.0/-4.0". There is never a mention
in any of these brochures or my construction and operation Manuals, (that
I can see anyway), that mentions +4.0G?
Could you provide me with a reference as even if I proceed to the original design
specifications then this is very important.
Regards and thanks again for your input.
Matt.
--------
Pulsar 1 TD Kit.
Captain B777.
Licenced Aircraft Maintenance Engineer.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=381005#381005
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