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Thank You: Diesel Europa tri-gear MG?

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dbvz(at)hotmail.com
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Posted: Sat Feb 06, 2010 9:59 pm Post subject: Thank You: Diesel Europa tri-gear MG?

Thanks for the comments.  I was not aware a BRS was a serious problem for the Europa.  Nothing I have flown has had it C but I thought it would be a nice add in an EXP.  Scratch that.

  

 For the range C I was looking for the maximum fuel load with me in the plane and nothing else.  In other words C useful load less 175 pounds all as fuel with the tankage for it.  Not sure where to put it C so if anyone has done it that would be useful information.  One thought was that the J.L. Osborne Inc. tip tanks (for like a Comanche) actually "lift themselves" since the tanks and fuel weigh about the same as the additional gross weight permitted when you add the tip tanks on a Comanche.  The tip tanks improve the wing performance and puts some weight on the "other end" of the wing where it actually helps with the stress forces at the wing roots.  But I suspect putting some weight out at the end of the MG wing may not be possible because of structural issues.

  

 The turbo-diesel is obviously for altitude and fuel economy C but also for speed.  For economy cruise it would be running at slightly less than 50% power.  Speed or range C you can only get one.  You can throttle back for more economy C but for more speed you have to have enough power to pull it along.  The Europa performance sheet said 150kts at 10K with the Rotax 914 C and I expected a 120HP turbo-diesel to do as well for max speed C and better than the 914 for max range.

  

 I had looked at the WAM 120 because it has a peak power of 120HP C which is why I asked if it is possible to increase useful load with more power.  Many aircraft do.  My Cherokee 180 has a higher max gross than the same airframe with less power.  Does the Rotax 914 allow a higher max gross than the 912?  If tip tanks are not possible C perhaps the long wings with the WAM 120 would rate an adjustment to the maximum gross?  I am not sure how much freedom the builder has to make these adjustments.  Piper does it C but they have an engineering staff to justify it.  The STC for the Osborne tips provdes for a gross weight increase C but they went through some steps to prove the design.

  

 At this point I am mostly looking for comments on the feasability of this using the Europa MG as the platform.  So far it seems to be the best option C and where it can not be stretched to fit all the ideas (like the BRS) I would scale back as necessary.  I am just looking for the extent that the optimum dream machine would need to be scaled back C using the Europa; before making any decisions about getting started.  Thanks again for the comments.

  Dwight B. Van Zanen

 22426 262 Ave. SE

 Maple Valley C WA 98038

 (425) 432-2213   

 dbvz(at)hotmail.com (dbvz(at)hotmail.com)

 

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rampil

Joined: 04 May 2007
Posts: 870

Posted: Sun Feb 07, 2010 6:53 am Post subject: Re: Thank You: Diesel Europa tri-gear MG?

max gross wt has little to do with engine output for experimental

a/c and a lot to do with structural limits. Homebuilts do not need to

certify to part 23 performance stds.



No tip tanks for Europas without considerable re-engineering.



Maybe some basic reading in aerodynamic structures and aerodynamics

might be helpful for you

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