I am a newbie to the hobby. I am running an O.S. Engine (Max - 46AX) with a TT-2002-B 2" Standard Aluminum Spinner 2-BLADE, a TT-0140-A 1/4-28 ADP Kit With 1/4" Bushing. Here are my problems:

1. When I try to assemble the unit using a Top-Flite Power Point 11X6 wood propeller (which is 3/8" thick), the adapter nut is not able to tighten sufficiently against the propeller. The adapter nut appears to reach a stop before fully tightening against the propeller.

2. When I try to assemble the unit using a Master Air Screw 11X6 nylon propeller (which is 17/32 " thick), the adapter nut is able to sufficiently tighten the propeller but the spinner will not sit against the backplate. It is close, maybe a 1/32" too long.

Also, my 3/4" 10X32 retaining screw appears to be too long for the Standard Aluminm Spinner.

What should I do?

1. I can go to a 2-3/8" TT-2052-B 2" Ultimate Style 2-BLADE Aluminum Spinner and I believe that will work with the nylon propellers. But what do I do about the wooden Top Flite Power Point props?

I would appreciate your help.

For #1 - Try putting the OS prop washer on before the adapter nut.

For #2 - What is hitting? Is the spinner touching the end of the adapter nut? Or is the spinner touching the prop blades?
If it's touching the adapter nut, the longer 'ultimate' spinner might work. Or you could file off the end of the adapter nut to get the clearance you need.
If the spinner is touching the prop blades you'll need to file or sand the slots bigger so they don't touch.

The 10-32 socket head screw can be cut shorter or replaced with one that is shorter.

Check this diagram of Ken's - might shed some light?

somegeek

Aluminum spinners are usually used on bigger, fancier planes for looks while the plane sits in the pits. For trainers or most planes I wouldn't bother. They are expensive and as you found out may not be as user friendly. Personally I would just stick with nylon spinners. They should be less of a problem and also offer better protectiion for the engine in case of a crash by absorbing some of the impact. As far as wooden props goes, I tried em and don't use them. If the engine is running and the prop touches anything, even slightly the prop will instantly break with a loud snap! Master Airscrew are great for training because they can take a divet out of a grass runway usually without damage. For higher efficiency props use APC brand. Not quite as forgiving if the prop contacts something but the prop produces more pull for the same engine. These other props are also a little heavier than wood props which acts as a fly wheel. This allows a better idle at lower speeds. [8D]

Why not use them on smaller planes?



I like the 2 1/2" one I installed on my LT-40(first build BTW).

somegeek

Re: "Why not use them on smaller planes? "< the original problems M. Michael Meyer is experiencing is a pretty good reason to start with. [8D]

Sounds like a hardware problem and not a plane size problem. Not sure where the plane size weighs in here?

I installed an aluminum spinner w/ an APC 11x5 with no problems on my .46 AX. Adapter fit great with no issues.

somegeek

Ditto on my TT .46

Re: " Sounds like a hardware problem and not a plane size problem. < so you are saying that the hardware which is the aluminum spinner is the problem. Hmmmmm...

Mine was from Maxx Products, - I think it's just a generic chinese bar-stock import, but it's pre-polished, balances pretty close, and very inexpensive.

I think the spinner size is a big part of the issue. A 2 inch spinner is really short from front to back. A 2.25 or 2.5" would probably be a better fit for the engine and prop combo.

For a newbie and cost efficiency I would recommend a MAS prop (definitely not wood) and a plastic spinner. If you just must have an alum spinner, get a larger one.

You are a newbie and want a good suggestion? An old timer made this suggestion to me, and its worth considering. Get rid of the spinner and get a Harry Higley aluminum prop nut. They still look good, but they are incredibly easy when it comes to prop changing and as a newbie, you'll be changing prop every now and then. A spinner might give less drag, but does it matter in a trainer? I love the prop nuts, they look good enough, and make it a snap when it comes to changing props.