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Twin Engine Quicksilver MXL 11 Sport

Posted By:
Ronnie Baker
Homebuilder or Craftsman
1
Post
0
#1 Posted: 9/11/2010 21:35:37

I have a MXL 2 Sport with full Lotus floats and amphib gear. Powered by Rotax 582. What I am thinking about doing is installing

another root tube below existing one and mounting 503 rotax with drive shaft and tractor prop. I would use front engine for takeoff and climbout from short field. Then shut of and fly on 582 pusher. I know I could install a 100 HP but I already own the rotax 503 and thinking of the expence of a 100 HP engine.  The floats added wieght and drag making this aircfaft climb like aGoose with lead feet. I am looking for info and your thoughts on this.



Dick Anderson
Homebuilder or Craftsman
74
Posts
14
#2 Posted: 9/14/2010 20:18:53

Hi, Ronnie.

     I'm going to respond as if you are not joking...

     Well, first of all, can you be more specific than "climb like a goose with lead feet"? Also, how short of a field are you attempting to fly out of and is it land or water? How much weight are you trying to lift? Maybe your expectations are not realistic. Adding a 503, tractor drive, etc  on an amphibious MXL2 is a major "modification" (total redesign). If it could be accomplished, and yes,there have been aircraft of this configuration, shutting down the front engine in flight with the extra weight and windmilling prop will likely be more than your already struggling 582 can handle. More obvious solutions would include reducing the weight of the aircraft and the cargo- make a 1 seater out of it. Go on a diet. Is your 582 producing its full rated power? Is your prop/reduction drive optimized for this mission?



Dick Anderson
Jim Robichaud
Homebuilder or Craftsman
10
Posts
3
#3 Posted: 2/10/2011 17:22:41

Ronnie-

 I have owned single surface and double surface 2-place Quicksilvers.

I fly a Sprint II with full Lotus and amphib gear with a 582.  I have almost 400 hrs on it and have flown guys as large as 300lbs [I weight 190.]  

Any other 2-place Quicksilver on Full Lotus will be a dog with 2 people on-board.   The Sprint II is the only way to go in a 2-place Quick on floats.  Even the Quick-alikes will tell you that.

It is the low lift of the wing, not the float drag that is causing your climb problem.  You need to get that wing flying really fast to generate the lift needed.  

My recommendation is to put the MXL II back on wheels and sell it.  Buy a Sprint II on wheels and put the floats on it.  You will like the setup.

-Jim
Kelly.jpg



Grant Smith
Homebuilder or Craftsman
135
Posts
7
#4 Posted: 2/12/2011 09:57:32
Ronnie Baker wrote:

 

I have a MXL 2 Sport with full Lotus floats and amphib gear. Powered by Rotax 582. What I am thinking about doing is installing

another root tube below existing one and mounting 503 rotax with drive shaft and tractor prop. I would use front engine for takeoff and climbout from short field. Then shut of and fly on 582 pusher. I know I could install a 100 HP but I already own the rotax 503 and thinking of the expence of a 100 HP engine.  The floats added wieght and drag making this aircfaft climb like aGoose with lead feet. I am looking for info and your thoughts on this.

 

Two engines will take you out of the LSA classification and require a PP Land and PP Sea to fly the aircraft. You will have difficulty getting the required ratings at a reasonable price if you are not already qualified. Welcome to the ranks of the outlaws. 

 



Grant Smith CFI