Prop Question
 

Ok I have a O.S.65 and a 11x8 prop and when I try to screw the prop on to the motor and its tooo tight and theres no where to hold on to the shaft to stop it from spinning! Any ideas?

Andrew

RE: Prop Question
 

Does the prop sits well on to the flywheel?
If not you will have to enlarge the hole of the prop with a reamer.
Then the prop will have a nice grab with the flywheel and there will be no problem turning the nut (after the washer)

RE: Prop Question
 

Andrew,
You don't screw the prop onto the shaft. The hole in the prop is usually too small and must be reamed out to the correct size. Then it will just slip onto the shaft. Don't try to drill it out with a drill bit, you'll end up with a slightly off center hole which will cause excessive vibration. Use a prop reamer like this. http://www3.towerhobbies.com/cgi-bin...&I=LXK248&P=ML . They come in both standard and metric sizes.
Paul

RE: Prop Question
 

Prop reamer is the only way! Just don't take any short cuts you might just cause damage to the motor.

By the way was my post from the other thread any help?

Sorry it got locked.

Mark

RE: Prop Question
 

Sounds like a reamer is the way to go!!! Do you think the avage person would have one at a flying field? Yea mkharv I picked up a spinner today just what I need!! :)

Andrew

RE: Prop Question
 

Yes I carry both metric and SAE reamers with me most of the time and for times when attending a competive event I may instead assure all spare props a pre reamed.

Keep in mind many times a spinner backplate will need to be reamed. Screwing a prop or spinner back plate on to the shaft will aggrivate a tendency to viciously throw a prop even in flight.

John

RE: Prop Question
 

I do like Dubro plastic spinners, they have a set of rings to match the shaft.
On nicer planes Y do like True Turn spinners, but then you will have to buy an extra set of ring and nuts to match your particular engine-prop.

Happy Landings.

Alfred

RE: Prop Question
 

Ok i cant figure out how to attach my prop it just slips and doesnt catch on to the engine picture included I am useing a durabo spinner..

Right now it is backplate, prop, prop washer, nut, bolt, cone... Thanks!

Andrew

RE: Prop Question
 

The prop nut you are using looks like it from an aluminum spinner setup. It could be that it is bottoming out on the crankshaft threads and therefor not putting any clamping force on the prop. You don't need that nut for your Dubro plastic spinner anyhow. I'd just use the original nut and washer that came with the engine. If you don't have that nut and washer, you can easily get replacements: http://www3.towerhobbies.com/cgi-bin...?&I=LXCP11&P=Z The link if for the .91 4-stroke nut and washer but it is the same 5/16-24 thread as the .65-LA and will work fine. (I didn't see a specific replacement nut for your particular engine)

RE: Prop Question
 

Any configuration I can do with out buy sh*t? Need to have it ready tommorrow :(
'
Its not bottoming out theres plenty of room to tighten it is just the motor turns over when I try to tighten it all the way theres no where to grip it with out tightening it..

Andrew

RE: Prop Question
 

generally speaking, one side of the prop is all you need to grab to start tighten the nut, as ChuckW mentioned the nut that you are using is not the apprpiate for this setup.
The shaft of your engine should have a threaded portion and an unthreaded portion just where the flywheel meets the shaft. Your dubro backplate spinner should sit flush with the flywheel, there are some dents at the flywheel as well as the backplate spinner and that is enough to avoid the engine from turning when you are tighten the nut.
I would change the nut and try to find the right one.

RE: Prop Question
 

Just hold the prop as you tighten it. Sometimes it helps to use a towel or wear a glove so the prop doesn't dig into your hand as you torque the nut. It sounds like you are going to try and fly the plane tomorrow? If so, I'm sure someone at the field will be willing to take a look at it. I'd have them check everything over just to play it safe.

RE: Prop Question
 

Thats the problem there arnt any for them 2 connect... Should the fly wheel have the fat part agianst the engine or prop?

RE: Prop Question
 

Andrew, make a two sided 80 grit sandpaper disk. It should be about the same diameter as the hub of your prop. Use your glue of choich, but the rough sides should be facing apart. Make a hole as close to center of this disc as you can, and slide it on either after the spinner backplate, or before. The sandpaper grit will bite into both surfaces, thus locking everything into place.

RE: Prop Question
 

I'm not sure what you mean here. What part are you refering to as a flywheel? An airplane engine usually does not have a flywheel, instead the prop itself serves this purpose. I think some of the Evolution trainer engines had sort of a flywheel on them to help add some rotating mass to help with idle and other stuff but that is all I have ever seen.

The sandpaper trick that deadey recommended works very well when you have a stubborn prop and spinner. Your setup though should be just fine without it. It is kind of tough to diagnose the problem without seeign it in person. I would take it to your field and have someone take a look at it.

RE: Prop Question
 

Hi!
Many newbees think that a spinner is right!...It's not! ...at least if it's a plastic spinner.
The only (there are exceptions)spinner worth trying is the Tru Turn aluminum spinner or its Chinese counterparts from Dave Brown products. A good alternative to a spinner is to use an aluminum spinner nut!
Also use an APC prop instead of that MA prop!!!

RE: Prop Question
 

Did you buy your engine new, or was it part of a package deal? If you got it new you should have the washer and nut shown in the picture and you should use it instead of the spinner adapter that we've seen in the pictures you have posted. If you do not have the original washer and nut, you have to try to deal with what you have.

All of the pictures you have posted show a socket head screw in the spinner adapter nut. Since you wrote that you have a Dubro nylon spinner you need to take the socket head screw out and put it in your toolbox.

I sort of hate to suggest this, but you may need to use pliers to keep the engine from turning while you get the prop snug. Once it is snug, friction should hold everything still while you really tighten it.

Use some rubber strips, cloth, or whatever you have to protect the "flywheel" from the pliers.

You'll need something like the ones pictured to get a large enough jaw opening to grab the "flywheel." Be sure to protect it from the pliers.

RE: Prop Question
 

I disagree. The Dubro plastic spinners work very well as do many from other manufacturers. I agree that the Tru-Turn's and other aluminum spinners are nice (I own several) but not always practical or necessary on a primary trainer plane. As for APC props, I also prefer them but the Master Airscrew props are often better for new pilots on trainer planes since the can withstand more contact with the ground on bad landings.

RE: Prop Question
 

Take out the allen head screw from the adapter nut. It looks like it is in too far and hitting the crankshaft thus not allowing the nut to seat properly. Based upon your post, it seems that the help off an experienced pilot/builder/engine guru onsite to help would be your best bet if possible. They would be able to show you how to setup everything correctly. They should be able to show you how to balance your prop correctly as well. MAS props are rarley ever balanced right out of the bag.

RE: Prop Question
 

Hi Andrew , It is possible that you could have the wrong spinner adaptor and the eng of your crankshaft is screwed all the way in and is bottoming out againt's the spinner adaptor nut. I have had that happen before. The other possiblity is you have the allen screw too far in , you need to remove the allen screw at this point to find out if the crankshaft is bottoming out again't the back side of the spinner adaptor nut. If it will tighten up then, you might have to shorten the allen screw if it too long. Hope that helps you.

RE: Prop Question
 

Its fine guys it flew great to day!

Andrew

RE: Prop Question
 

What did you find the problem to be ? Robert

RE: Prop Question
 

It ended up being a never useing glow motor/prop mistake wasny sure how to tighten but you have to hold the prop. I wasnt sure one of the guys at the field fixed it up and I have flown 3 tanks on it so far and idled 1/4th of a tank today (At the house) just to get used to the starting of a glow motor! Started right up no problems!

Andrew