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Kadir
Unregistered
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 Posted Saturday, November 21, 2009 @ 04:04 AM
As the RF5B is a type certificated aircraft in Europe, I need to repower my plane with an engine/prop combination with a STC'd conversion.
Any suggestions other than the obvious "Limbach L2000E01"
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Jorgen
Unregistered
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Posted Saturday, November 21, 2009 @ 05:48 AM
Hi Kadir,
it´s difficult to answer your questions without knowing more about the rules you are subjected to. Right now, there is much commotion in Europe regarding the homogenization of airtransport rules and maintenance, called EASA (or CAMO when it comes to maintenance). In many countries this has complicated matters, in others it´s "business as usual" just with another set of papers. A new set of rules can however also open up for different interpretations, which in some cases might facilitate matters.
Whether it complicates things or not is dependent largely on who handles the certification in your country. In Sweden, the gliding federation handles the certification questions for motorgliders and my impression is they will help IF you can help them provide documentation for whatever you want to do.
Conclusion: talk to the handling authority but be prepared. THe more you know about other options and how they are certified in other countries, the better chance of getting what you want. There is a Rotax-powered RF 5 in Germany for instance, get hold of them and ask them about their certification. Even certifying a new engine option might be difficult but not impossible. Remember, René Fournier himself got Fourniers certified when there was no certified singel ignition aeroplanes before.
May the 4´s be with you/ Jörgen
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Kadir
Unregistered
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Posted Monday, November 23, 2009 @ 05:30 AM
Thanks for replying Jorgen
Here in Turkey, as long as a modification has been approved and STC'd by an aviation authority in any country which has an agreement in aviation matters with Turkey, such as the FAA or any European CAA, now JAR or any authority which has a reciprocal agreement with one of these authorities, that mod will be approved by the Turkish CAA as long as the STC can be documented.
Difficult to understand but mods approved on RF5 may not be legal here on the RF5B 
Therefore any mod suggested must apply to RF5B
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Jorgen
Unregistered
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Posted Monday, November 23, 2009 @ 11:15 AM
Kadir,
that´s precisely my point. Authorities have a preferrence for using arguments like "legal" or "approved", suggesting that the rules are as absolute as the boiling temperature of water at sea level, all to avoid (for them) unconfortable discussions. Our job is to not let them get away with that unless they have good arguments for their standpoints.
May the 4's be with you/ Jörgen
[Edit by Jorgen on Monday, November 23, 2009 @ 11:16 AM]
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eugenio
Unregistered
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Posted Monday, November 23, 2009 @ 02:02 PM
You can choose also STC for Sauer engines, but you need to change also engine mount and propeller. This mods will indeed cost a lot of money.
take care
Eugenio
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Kadir
Unregistered
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Posted Wednesday, November 25, 2009 @ 05:17 AM
Eugenio,
Thanks  does that mean I can use my Hoffman HO-V62 3 position C/S prop and the engine mounting that I have on my plane as originally supplied with Limbach L1700 or will these need to change too if I change to Limbach L2000E01???
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eugenio
Unregistered
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Posted Wednesday, November 25, 2009 @ 11:24 AM
If you change the engine you must change also the propeller. Each engine is approved with his own propeller. If you wish to use a Limbach you need a new engine and a new Hoffmann propeller (Fixed or variable pitch). If you opt for a Sauer you will need a new engine, a new engine mount (Sauer is different) and a new MT propeller.
You can have a look of engine/propeller coupling on the TCDS published on the german website
http://www.cfi-ev.scram.de/D/Index/default.htm <technick> <RF Kenblatt> <RF5>
There you will have all answers you need.
Eugenio
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Kadir
Unregistered
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Posted Thursday, December 3, 2009 @ 02:31 PM
I had this interesting dialogue with Steve Bennett of Great Plains Aircraft this week:
"Steve, I would prefer to go for the larger engine, 1915cc. What is the performance of that engine? Considering the Limbach at 1700cc was 68hp, is your 1915cc more powerful having more cc at same stroke?
Kadir, I think they use different math than we do. We rate the 1915 at about 65 hp and a 1700 at about 55 hp
Steve Bennett
Great Plains Aircraft"
What is the math?? is Limbach 1700 not 68Hp?
Kadir
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eugenio
Unregistered
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Posted Thursday, December 3, 2009 @ 03:10 PM
Limbach (and generally all european VW conversion maker) and Great Plains use two different ways to rate the engines. All european makers rate the 2000/2100 for 80 hp, while GPSAC rate the 2100 for 75 hp. This is just a different way to rate the output power.
Anyway if you use 92 mm cylinders instead of 88 mm on your engine you will have a few hp more, but you're not officially legal. Nobody will see the difference unless open the engine and measure it.
Eugenio
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