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Old 02-16-2009, 07:49 PM   #1
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Question Spinner Question

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As most of you know, I love the Yak Airframe. My personal preference is without a spinner.

I dont like the look with a spinner, so to both save weight and to meet my likes, i dont use them.

On my QQ yak, it seems I will need one to help with balance, so them I got thinking.....


Does a spinner help with 3D, engine spooling, does it slow the prop, speed the prop ect....?

Why use a spinner?

Does it help the engine, more weight on the crank... harder/slower to spool.....?

Wow.... what do you think!

Thanks guys, looking for 3d applications.

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Old 02-16-2009, 08:53 PM   #2
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Re: Spinner Question

Rolly... I had an Aerotech Yak with DA85 in it and a 5" spinner. I was at an Ottawa IMAC contest and lost the spinner (just left with the backplate) in the middle of my routine. It didn't change a thing. For 3D, I doubt you'd notice any difference also.

IMO, it is just cosmetic, but I'm interested to hear what other's have to say also!!


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Old 02-16-2009, 09:33 PM   #3
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Re: Spinner Question

Spinners will increase efficiency over the blades as it forces the air outward towards the airfoil of the prop. The blunt nose will simply catch unwanted air, ie more drag and less efficient flow around the surface.

As far as weight effecting spool up etc, yes that is possible, as you are adding mass. All you have to do is look at comparing a heavier wood prop vs a CF equivalent, spool up time will decrease the lighter it is.

Having said all that, on a Yak I didn't run a spinner, like the look of it better, however, on my extra I bought a Pete's CF spinner and I love how it looks and how light it is.

So really, your choice and pick what you like the look of best because lets be honest, at our level, we are never probably going to notice a difference.

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Old 02-17-2009, 01:56 PM   #4
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Re: Spinner Question

On a full size plane, with a cowled engine, the spinner also helps to direct the airflow into the cowl openings to assist cooling.

I would expect an identical effedct on the large more or less scale models with the engines inside cowls.

I'd also expect that with out the spinner you'd notice the engine will drop rpm quicker as well as speed up faster, since there would be less inertia (flywheel effect) with less weight on the crankshaft.
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