Magnum .40 questions

Jan 17, 2004 2 Replies
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S

Bought a used Magnum .40 on ebay. No instructions. Questions:


  1. What would be a good prop to use, mabye a 10X6?


  1. Max RPM?

  2. How to start. How many turns should needle valve be opened?

Thanks in advance!


-- Scott Gotta Fly or Gonna Die

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RV-4


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C
  1. What would be a good prop to use, mabye a 10X6?

  1. Max RPM?

  2. How to start. How many turns should needle valve be opened?

Thanks in advance!

-- Scott Gotta Fly or Gonna Die

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RV-4 ============================================== Here's a link to the engine on the Hobby People web site
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Here's the link to the manual, it's a 237k download
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Some of the relevant info

Propeller Size Recommendations XLS 40 Engine

8.5 x 6 9 x 6 9 x 7 10 x 5 - use for break-in 10 x 6 10 x 7 11 x 5 11 x 6

Ideally you want a propeller that the engine will turn in the 13,000 -

16,500 R.P.M. range on the ground, yet power the airplane sufficiently.

Starting point for high and low needles is 2.5 turns from closed

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