Propeller mounting - thick APC prop

[mclarkson]

Hey guys. I'm putting an APC 9x5 on a 2410-12D Brushless outrunner from HeadsUp RC.

The motor comes with a small assortment of washers and nuts but somehow it just doesn't feel secure. I've inserted the adapter into the prop to size it down for my 3mm shaft, but that's only at the very rear. Everything else is a tiny shaft going through a big, big hole.

I can't convince myself that when I tighten this up, I can be assured that everything's centered up very precisely.

Am I worrying over nothing? Is there a trick in this situation? Thanks for any insight.

[rcers]

First that is a 9x6 prop and it will draw SIGNIFICANTLY more than the recommended 9x5 GWS HD 9x5 prop.

You should be OK if you can crank it down and so long as your spacer is 3mm. They only center the prop from the back. So that is nothing to worry about. YOu will need a washer on the front of that for the nut.

Mike

[mclarkson]

You're correct. That is a 9x6. Thanks for the info.

[CHELLIE]

get a 3mm prop adapter for your motor, and cut the motor shaft back so the prop adapter sits flush or almost flush with the bell. or as far back as it can go. that will help to keep the motor shaft from bending, hope that helps, Chellie

http://www.headsuprc.com/servlet/the...r-3.0mm/Detail

Prop Adapter for 3mm prop shafts - regular size
This collet type aluminum prop adapter has a 1/4" diameter x 5/8" long shank. Most APC props fit this adapter very well.

[kyleservicetech]

Originally Posted by mclarkson

Hey guys. I'm putting an APC 9x5 on a 2410-12D Brushless outrunner from HeadsUp RC.

The motor comes with a small assortment of washers and nuts but somehow it just doesn't feel secure. I've inserted the adapter into the prop to size it down for my 3mm shaft, but that's only at the very rear. Everything else is a tiny shaft going through a big, big hole.

I can't convince myself that when I tighten this up, I can be assured that everything's centered up very precisely.

Am I worrying over nothing? Is there a trick in this situation? Thanks for any insight.

Is that an APC prop? or an electric APC-E prop? The electric propellers are significantly thinner, and likely more efficient than the props used on glow engines. Also, the APC-E props come with several different "rings" to allow for different shaft sizes.

[Rockin Robbins]

And then there are the APC SF slow fly props that may be even better, depending on your application. If you are looking for high thrust and low speed, SF props are very difficult to avoid using! So you have three families of APC props to choose from.

[kyleservicetech]

Originally Posted by Rockin Robbins

And then there are the APC SF slow fly props that may be even better, depending on your application. If you are looking for high thrust and low speed, SF props are very difficult to avoid using! So you have three families of APC props to choose from.

As with any propeller, these devices have maximum RPM limits. Take a look at several sites on the APC web sites showing different props available, along with how to determine if you're running your prop safely:

http://www.apcprop.com/v/html/rpm_limits.html

http://www.apcprop.com/help.asp

http://www.apcprop.com/SearchResults.asp?Cat=24

[road king 97]

All apc props are 5/16 hole on the front hole the rear hole is bigger.I bought nitro props for my sea plane and my collet for prop was 5 mm. I ordered these and they fit in the back hole and were very tight with no carving on my part at all. They sell these from horizin hobby also under landing products .http://h1071118.hobbyshopnow.com/pro...p?prod=APCMPA1 I hope this helps you! Ps They have smaller ones left on my sheet i cant use ,pm me and i will mail you the extra ones if you want them . joe

[Rockin Robbins]

Originally Posted by kyleservicetech

As with any propeller, these devices have maximum RPM limits. Take a look at several sites on the APC web sites showing different props available, along with how to determine if you're running your prop safely:

http://www.apcprop.com/v/html/rpm_limits.html

http://www.apcprop.com/help.asp

http://www.apcprop.com/SearchResults.asp?Cat=24

With the E series and the SF series props you'll see motor review after motor review spinning these props over their limits and sagely pronouncing the match a great one. It can be very dangerous to do that and I'll bet the reviewers didn't even check the above web pages.

[road king 97]

If you look at the first page of this thread, he notched two nitro props in the middle to make a four bladed one for electrict sea plane. That was a little scary for me so i found the apc 4 bladed prop in one piece. This guy and ivan who drew my plans are running the same two piece prop . lol joe http://www.rcgroups.com/forums/showthread.php?t=682384

[Rockin Robbins]

Oh my! He cut away the hub from half the propeller root. I'm sure he has bushels and bushels of engineering data and testing to prove it's completely safe to watch on television. Or from 100 yards away. Or not.....

Run away!!!

[kyleservicetech]

Originally Posted by Rockin Robbins

Oh my! He cut away the hub from half the propeller root. I'm sure he has bushels and bushels of engineering data and testing to prove it's completely safe to watch on television. Or from 100 yards away. Or not.....

Run away!!!

On a completely different thread in www.wattflyer.com, we've got a guy who states it is safe to run those back yard flyer props at 20,000 RPM.

(Not in my backyard )

[road king 97]

Originally Posted by Rockin Robbins

Oh my! He cut away the hub from half the propeller root. I'm sure he has bushels and bushels of engineering data and testing to prove it's completely safe to watch on television. Or from 100 yards away. Or not.....

Run away!!!

Yea i thought it was a little weak so thats why i started searching for 4 bladed props all made in one piece. Iam running gear boxes on my electrict motors so my props wont be spinning very fast and i balanced them very good with two different balancers . joe

[eagle33]

mclarkson: Here's another alternative. Run your problem by Jeff Anderson of HeadsUpRC (via email, headsuprc@yahoo.com). He's good for help on subjects like this. Jeff is an expert on motors and props and their ancillary equipment including installation problems. He usually gets back to you within a day or less.

[Rockin Robbins]

Originally Posted by kyleservicetech

On a completely different thread in www.wattflyer.com, we've got a guy who states it is safe to run those back yard flyer props at 20,000 RPM.

(Not in my backyard )

Your link goes to the Wattflyer main page. I'd love to see the thread!

[kyleservicetech]

Originally Posted by Rockin Robbins

Your link goes to the Wattflyer main page. I'd love to see the thread!

Some of what this guy was doing in that thread was extremely dangerous, some newbie might actually try it. The rest was questionable.

Don't want to start that thread again, I'll send you a private email.

[Rockin Robbins]

You're right. Thanks!

Edit: now I've seen it and it never needs to be seen again. That's the most blatantly unsafe idea hyped in the most unqualified manner I've seen lately. And its suggested use just about guaranteed injuries. Nuff said....

[kyleservicetech]

Originally Posted by Rockin Robbins

You're right. Thanks!

Edit: now I've seen it and it never needs to be seen again. That's the most blatantly unsafe idea hyped in the most unqualified manner I've seen lately. And its suggested use just about guaranteed injuries. Nuff said....

Yup
One very good thing about www.wattflyer.com, if someone puts something in that is unsafe, or is questionable, other readers will quickly respond!

[mclarkson]

Not to get back on topic but ... I've decided that the APC 9x6 is just too fat and heavy for me. I'm gonna switch to the much thinner GWS prop for now.

FWIW, the 3mm adapter that Chellie recommends flat won't work because the APC prop is way too thick. However, the prop adapter from a stock Stryker (3mm or 3.2mm shaft) works just great.

[Rockin Robbins]

Doesn't make sense, Mark. Heads Up website specifically tells you to use that adapter with that motor for APC and Master Airscrew propellers. I'm POSITIVE he wouldn't say that unless it works. He says the GWS EP9050 is best for that motor anyway. With APC props he recommends the 9x4.5E or 8x3.8SF. Looks like the prop you're trying now probably has too much pitch.

[mclarkson]

I actually think the pitch would be okay if I didn't go crazy, but that prop adapter is just too short for that thick prop. Maybe other APC props work fine? I dunno. But the 9x6E and 9x7.5E that I have here are 1/2" thick. I use that prop adapter, but on props that are 1/4" thick or less. :shrug:

As I said, I'm going with the GWS 9x5's, instead anyway. The APCs are very thick and weigh a lot, and I have nose-heavy issues.

[road king 97]

Buy the time you buy a new collet and metric adapters you are cheaper buying a new prop . Good luck with flying her. joe

[kyleservicetech]

Originally Posted by mclarkson

I actually think the pitch would be okay if I didn't go crazy, but that prop adapter is just too short for that thick prop. Maybe other APC props work fine? I dunno. But the 9x6E and 9x7.5E that I have here are 1/2" thick. I use that prop adapter, but on props that are 1/4" thick or less. :shrug:

As I said, I'm going with the GWS 9x5's, instead anyway. The APCs are very thick and weigh a lot, and I have nose-heavy issues.

I just checked my old 8X6 APC props for glow engines. Their hub is 0.462 inches thick. Compare that to a12X8 APC-E (for electric) prop whose hub is 0.376 inches thick.

Could your props actually be for glow engines? Glow engine APC props have a much heavier blade cross section than an APC-E prop of the same diameter and pitch size.

[mclarkson]

I ... don't think so. I got them from Headsup. I run the same prop in a 9x7.5 on my Tower Hobbies P-51.

Of course, I'm constantly confused about propellers...

[guapoman2000]

Mark,

There should be nothing to be confused about Propellers, however, they are extremely important to know which type along with diameter size and pitch your model would need to adequately work at the highest efficiency and balanced with practical $$ application.

I use nothing except "GLOW" propellers on my fast Zagi and Combat wings as those RPMs are in the 18,300 range at wide open with just 3-Cell Li-POLYs and speeds of upwards to 80 MPH. You certainly don't want to use an ELECTRIC propeller at those RPMs just "Because" the model "is" Electric.

There are many considerations of selecting Propellers and to keep it easy always remember that you NEVER use "ELECTRIC" Propellers on GLOW (Internal Combustion) applications, however, you can always use GLOW Propellers on ELECTRIC setups when the situation permits and especially there is a specific requirement.

I would seek local Hobby Shop help and someone that is very knowledgeable on ELECTRIC power systems, all types.

Be Safe!