Today's Message Index:
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1. 10:02 PM - pulsar xp with subaru ea81 ? (ar99kid)
2. 10:28 PM - Re: pulsar xp with subaru ea81 ? (Brian Anderson)
3. 10:42 PM - Re: pulsar xp with subaru ea81 ? (ar99kid)
4. 11:13 PM - Re: Re: pulsar xp with subaru ea81 ? (Keith Palmer)
5. 11:16 PM - Re: Re: pulsar xp with subaru ea81 ? (Brian Anderson)
6. 11:23 PM - Re: Re: pulsar xp with subaru ea81 ? (freedom4life)
7. 11:48 PM - Re: pulsar xp with subaru ea81 ? (ar99kid)
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| Subject: | pulsar xp with subaru ea81 ? |
hello
i am a new owner of a pulsar XP project . the aircraft is almost finished as body
, but without an engine. i have sourced here a subaru ea 81 motor with bing
carbs and reductor at 200lbs. this motor installed with all the fluids will be
about 230-240 lbs. xp suppose to heave a rotax 912 and this one is 60-70lbs
lighter.
so question : is this motor too heavy for the pulsar xp ? i was thinking to get
the CG back in place positioning the battery farther back and maybe some of the
accessories . also considering to make the engine mounting something like that
for jabiru2200 on the firewall . working in composites is not a problem for
me but i would like to learn some opinions about this setup .
i have the composites wing spars and covering , not the wood ones !
thanks !
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=412672#412672
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| Subject: | Re: pulsar xp with subaru ea81 ? |
Not only is the engine way too heavy, you probably wouldnt find enough room to
fit it, plus the reduction gear into the cowling.
Brian
On 11/11/2013, at 6:58 pm, ar99kid <ar99kid@gmail.com> wrote:
>
> hello
> i am a new owner of a pulsar XP project . the aircraft is almost finished as
body , but without an engine. i have sourced here a subaru ea 81 motor with bing
carbs and reductor at 200lbs. this motor installed with all the fluids will
be about 230-240 lbs. xp suppose to heave a rotax 912 and this one is 60-70lbs
lighter.
>
> so question : is this motor too heavy for the pulsar xp ? i was thinking to get
the CG back in place positioning the battery farther back and maybe some of
the accessories . also considering to make the engine mounting something like
that for jabiru2200 on the firewall . working in composites is not a problem
for me but i would like to learn some opinions about this setup .
> i have the composites wing spars and covering , not the wood ones !
>
> thanks !
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=412672#412672
>
>
>
>
>
>
>
>
>
>
Message 3
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| Subject: | Re: pulsar xp with subaru ea81 ? |
thanks for quick answer !
the engine space is doable ! i have taken all measurements and with some mods to
the lower cowl for oil pan and radiator is working . so this is ok !
the weight is my concern because i have never flight a pulsar so i really do't
know this small aircraft... still i saw there are also fitted with the rotax 914
which is 30lbs heavier than 912 so remains "only" about 30lbs difference
!
is this such a big problem ?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=412674#412674
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| Subject: | Re: pulsar xp with subaru ea81 ? |
The 914 is not for the Pulsar XP - only Pulsar II & III with structual
fuselage modifications with AUTW of 1200lb
K'd
----- Original Message -----
From: "ar99kid" <ar99kid@gmail.com>
Sent: Monday, November 11, 2013 8:40 AM
Subject: Pulsar-List: Re: pulsar xp with subaru ea81 ?
>
> thanks for quick answer !
>
> the engine space is doable ! i have taken all measurements and with some
> mods to the lower cowl for oil pan and radiator is working . so this is ok
> !
>
> the weight is my concern because i have never flight a pulsar so i really
> do't know this small aircraft... still i saw there are also fitted with
> the rotax 914 which is 30lbs heavier than 912 so remains "only" about
> 30lbs difference !
>
> is this such a big problem ?
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=412674#412674
>
>
>
Message 5
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| Subject: | Re: pulsar xp with subaru ea81 ? |
In the XP version the Rotax engine is mounted on a bed mount in the lower cowling.
The loads are carried on uniglass beams glassed into the lower cowling, and
then through the firewall back into the fuselage. Later versions, I think the
series II and III, were built differently, with the firewall becoming more of
a structural component, and the loads from the truss type engine mount being
carried through into the fuselage with a completely different system. There have
been some of the later series fitted with the Rotax 914, and I think that
there may also have been an increase in the maximum weight too.
If you have to modify the engine mounting arrangements to handle the loads of a
heavier engine, then you are really beginning to design a new aeroplane. Heavier
loads, more structure, more weight.
The MAUW is another consideration. If you are adding 60 - 70 lbs of engine, then
that is 60 - 70 lbs less fuel you can carry. That is equivalent to about 40
litres of fuel. That only leaves about 30 litres [max] to play with. What is the
fuel consumption of the Subaru ?
Also, the most common location for the battery in the XP is already behind the
seats. You cant get access any further back. Then you add more weight with heavier
and longer battery cables. Its a no win situation.
Why try to reinvent something when there is a proven formula that works really
well. The Pulsar operates brilliantly with the Rotax 912. With the standard 80hp
version I can exceed VNE in level flight, and my average fuel consumption is
about 13 litres/hr.
Brian
On 11/11/2013, at 7:40 pm, ar99kid <ar99kid@gmail.com> wrote:
>
> thanks for quick answer !
>
> the engine space is doable ! i have taken all measurements and with some mods
to the lower cowl for oil pan and radiator is working . so this is ok !
>
> the weight is my concern because i have never flight a pulsar so i really do't
know this small aircraft... still i saw there are also fitted with the rotax
914 which is 30lbs heavier than 912 so remains "only" about 30lbs difference
!
>
> is this such a big problem ?
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=412674#412674
>
>
>
>
>
>
>
>
>
>
Message 6
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| Subject: | Re: pulsar xp with subaru ea81 ? |
The EA81 engine does not produce near enough horsepower for its weight. I
wouldn't expect you would get any more than 65 - 70 usable horsepower from
this engine. I have flown several aircraft with this engine and the same
aircraft with the Rotax 912 have over double the climb rate and 20% more top
speed. I really think you will spoil an otherwise fantastic aircraft and
you will disappointed with the result.
Cliff
thanks for quick answer !
the engine space is doable ! i have taken all measurements and with some
mods to the lower cowl for oil pan and radiator is working . so this is ok !
the weight is my concern because i have never flight a pulsar so i really
do't know this small aircraft... still i saw there are also fitted with the
rotax 914 which is 30lbs heavier than 912 so remains "only" about 30lbs
difference !
is this such a big problem ?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=412674#412674
Message 7
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| Subject: | Re: pulsar xp with subaru ea81 ? |
well i get your points !
the main reason i am trying to do this setup is the price/budget. subaru or vw
is waaay accessible than a 912 ...they say that this ea81 is 100hp rated also
with 10-15% lower consumption than 912 . but because i have access to this engine
i will weight it and come back with real numbers and start from there ...
thank you all for your inputs !
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=412678#412678
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