Novotny

I just purchased a used K&B .40 engine and I want to use a 3" plastic spinner. The only thing that came with the engine was a heavy metal prop nut (no regular nut or washer). The prop nut will fit under the nosecone and hold the 10-6 prop on but I'm wondering if I will sacrifice engine performance with the extra fly-wheel type weight of the prop nut. Would I be better off to buy a nut and washer for under the nosecone?

Thanks

rcpilotsteve-RCU

My Feedback: (5)

I've seen those big prop nuts used because they look better on some models and because some of them are real heavy (weighted) for a Tail heavy plane. If you don't need the extra weight (how's your balance with it on?) get rid of it. I don't think you'll do any more damage to the K&B Engine either way

MinnFlyer

My Feedback: (4)

Ditto

Volfy

My Feedback: (23)

Not familiar with K&B, but just how "heavy" is this prop nut. If it is made of aluminum, I wouldn't worry about it at all, since it is not going to weight enough to affect balance too much. What weight it does have is very close to the driveshaft so it doesn't have much of a flywheel effect. In fact, these days I much prefer larger aluminum prop nuts than spinners. Reasons:

1. much easier prop change.
2. no more carving the sinner cone to fit large props.
3. much more durable, especially compared to plastic spinner cones.
4.can be used as a jam nut, if used with another regular nut.
5. better engine cooling compared to using large spinner cones.

Unless I have a plane that doesn't look right without a spinner, I use a prop nut. Starting with a starter is no problem even with my 1.20 4stroke and 2strokes.

daven

My Feedback: (1)

I completely agree with Volfy.

Unless the prop nut looks horribly out of place, they are all that I use. Dubro has a nice line of Aluminum prop nuts that add little weight and are all around much easier to use on your average sport planes.

Novotny

The prop nut is actually quite heavy. I don't think it is made of aluminum. I'll see if the model requires any nose weight and use it if so.

Thanks guys!

rcpilotsteve-RCU

My Feedback: (5)

I knew it had to be heavy for you to post that. The aluminium ones are quite light. One of the guys in our club drove 60miles to find a heavy one like yours.
I did a review on the GMS .47, when you tire the K&B you should consider it, 50.00 US with a pipe, new

KidVermin

My Feedback: (3)

Notny41:

I've got 4 of the Higley Heavy Hubs on some of my planes. The
best application was for the H9 Cub to get cg and it looks scale
too. The others are under the spinner for cg where I didn't want
stick-on weights showing. The weight that far forward saves lead
reqd. for cg. So far after 5 or 6 years, I haven't noticed any undo
wear on the front bearing. By the way it's brass.

Randy