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Model 3 with a 503 "Do-able"?

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manliker(at)uiuc.edu
Guest

Posted: Wed Aug 23, 2006 7:13 am Post subject: Model 3 with a 503 "Do-able"?

Anyone with a Model 3 (or similar) flying with a Rotax 503 engine installation?  I have a friend who just bought a Model 3 w/o engine, and he’s “kicking around” installing a 503.  Does anyone have experience with this airframe and engine combination?  Is it underpowered with two up?  

      [quote][b]

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jose_m_toro(at)yahoo.com
Guest

Posted: Wed Aug 23, 2006 8:54 am Post subject: Model 3 with a 503 "Do-able"?

Mark:



Skystar once offered the Kitfox 2 Lite.  It is my

understanding that it was a Model IV that was kept

light during construction.  Model III fuselage is

lighter than Model IV.  It should be possible! 

However, I don't know any case.  It will certainly

have less climb that a 582 powered KF III.  However, I

will not be surprised if cruising is similar.



Jose



--- "Anliker, Mark" <manliker(at)uiuc.edu> wrote:



 	  Quote: 	
		   Anyone with a Model 3 (or similar) flying with a

 Rotax 503 engine

 installation?  I have a friend who just bought a

 Model 3 w/o engine, and

 he's "kicking around" installing a 503.  Does anyone

 have experience

 with this airframe and engine combination?  Is it

 underpowered with two

 up?

 

 


	




__________________________________________________

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RichWill

Joined: 24 Feb 2006
Posts: 24
Location: Southern Maine

Posted: Wed Aug 23, 2006 4:00 pm Post subject: Re: Model 3 with a 503

I wouldn't do it!  Unless you are a 100lb pilot, will never take up another passenger, won't fly in hot humid weather... you'd be pushing the envelope.. 



Don't get me wrong.. the 503 is a great engine.. but a normal Model 3 with fuel and pilot is going to be a load for a 503..



my two cents

Rich

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7suds(at)Chartermi.net
Guest

Posted: Wed Aug 23, 2006 4:41 pm Post subject: Model 3 with a 503 "Do-able"?

Mark,

 I built and flew a Model IV XL Series  with a 503DCDI with a 3 blade ground adjust GSC for 5 years. The kit was  sold by Skystar with that engine option. My empty weight was around 530  pounds, and useful load was 420. I was pleased with the performance for a 52hp  bird, it would get off the ground faster than the 150 I was previously flying,  about 500' on grass and  200 on pavement (or less with a head wind). I  have flown all my children in it but not enough gross for me and my wife, I  am 6' 2" 220 pounds. I flew the plane into Oshkosh Airventure 3 times and I was  loaded to the max when I did it. It had two 6 gal wing tanks and a custom  10 gal aluminum header tank behind the panel. I would get 70 MPH cruise at 5900  RPM climb was at 55 MPH (at) 6400 RPM and I would get about 700' / min with me in  it, had wheel pants but no strut fairings. Was pleased with the engines  reliability, when it would get very hot, (like airventure time) I would have to  make a jet change to maximize engine performance. Was a blast to fly, but  then I think they all are. Is it the best engine for the 3, I don't know, If the  price is right and the numbers fit it might for now. I am building a 5 with  a 912, I am sure I will like it better but I have nothing but fond memories of  my 4 with the 503 in it. 

 Lloyd 

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dave(at)cfisher.com
Guest

Posted: Wed Aug 23, 2006 5:57 pm Post subject: Model 3 with a 503 "Do-able"?

Good report on the 503. 

 I just replaced a 503 single carb in a Kitfox 1  this week. 

 I broke the engine in today and test flew it for 30  mins.  Will  retorque heads tomorrow.

 This one weighs about 410 lbs and performs well  solo and dual with  2  (at) 200 each will fly fine but not a hot rod.  

 A model three i think has a 1050 gross and I think  the 503 would  make is underpowered but would fly.   The biggest  problem is that you would miss all the fun you could have with a 582 giving near  50% more HP and will give you an excellent performer both solo and dual.  

  

 What would be reason to choose a 503 over a 582 ?  

 Does he need engine mount as well?  I did  email a guy that had a complete FWF package for a Kitfox  582 for sale  but I do not have his info anymore.  I think i got it from Green sky  aviation but I am not 100% sure. 

  

 Dave 

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