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Old 08-23-2017, 09:01 AM
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solentlife's Avatar
Join Date: Oct 2010
Location: Ex UK Brit now in Latvia west coast - Ventspils
Posts: 12,523

Prop selection as you understand depends on results you want.

Pitch is for speed
Diameter is for thrust.

The thing to take into account is to maintain a pitch that will give speed reasonably over the stall or minimum speed needed.

I use eCalc for my motor / prop / battery selection ... and I find it is usually about 10-20% below actual field result.... in run time.

When I am setting up a 3D machine - I like to try the recc'd prop against eCalc's .... and I do not use Slow Fly's .... they lack the stiffness for good punch out in my view.

If the model shows good speed and obviously can fly a touch slower .. then I go down a step in pitch and up one in diameter ... but stopping once diameter gets to what I think is maximum model can take while standing horizontal on ground.
I like to find that vertical hover occurs at 55 - 60% throttle - which means I have more than enough to climb vertically.
The beauty of electrics of course is the versatility of throttle and ability to stop motor in flight .... unlike wet fuel. This gives a wider range of props we can use.

Sorry if I cannot advise what actual prop to use on your model - but hope the post can assist you in trialing props to get to desired.

Most of us go through this and I know not only myself - but many others have boxes of props from this ... all saved for that 'other' model etc.

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