O.K. I have a Great Planes nylon spinner with the vented aluminum backplate and I am preparing to lop off the tip. Before I do I was wondering if anyone would like to share their method for doing this. I would really appreciate it.

Dave,

Rusty Dose described a pretty good method for doing this.

http://www.rcuniverse.com/forum/fb.asp?m=9141370

Thanks, it was pretty much the way I was planning on doing it.

Does anyone know where to find some numbers to prove how effective this is in cooling?

could be the subject of an experiment by comparing the temperatures with the following configurations:

1. no spinner
2. spinner without cut
3. spinner with some cut if 1st config is way better than 2nd.

I know f3a pilots are doing it. They also have a variation of the top-cut spinner. See F3A unlimited website under spinner.

Maybe I'll do it if I ever get my replacement motor back. I don't like the way a cut spinner looks, but if it makes a big difference it's worth it I guess. I'll try with and without a spinner first and see what happens; if there's a big difference I'll cut a spare spinner and give it a whirl.

Of course I don't know if I have an appropriate tool to measure motor temperature for an experiment (at least to report on, fingers could be enough indication for myself).

I did the test a while ago. The cut-spinner did have better cooling.
See pics below:

I had three temperature sensors: motor, ESC and battery.
First flight with closed cone spinner, ambient temperature was ~72F
The flight with cut-spinner was about noon. Ambient temperature was ~84F

Coolling effect, or delta-T is what I interested. So the last two graphs show the temperature differences w.r.t. take-off temperature.
Closed spinner: max. temperature is ~20C higher than the initial temperature
Cut-spinner: max temperature is ~14C higher than the initial temperature. 6C or ~10F better than the closed spinner.

I use just the opposite method.

I chuck a cuting wheel up on my drill press and then position it at the correct height above the table of the press. I then rotate the spinner around the cutting wheel while holding the spinner backplate flat on the table. NO free hand blade this way.

George

I didnt care for the free hand of either method so I put the 1/4-20 bolt in the backplate like Rusty said then cut the point off any old way but just a little long while making sure the starter would fit over the cut off nose, then mounted in the drill press and came down on a piece of sticky back sand paper stuck to the table to make a nice square opening.
Turn the drill press slow to prevent the plastic from chunking up.

How does that cut spinner look on the plane? Maybe we need to get Tru-Turn to offer some with venting on the cone. Seems like that would look better than just hacking off the tip.

Great Planes spinner w/aluminum backplate with the tip removed...why?

The "modified' spinner provides (3) benefits-

1. Simple to install and align with a socket through the front.
2. Looks cool.
3. I believe it reduces the temperature in the (4) models I have tested (Oxai Beryll, Comp ARF Integral and GP Sequence, Sebart Wind 110) at least 5 degrees f.

Here are better photos of results of the Great Planes Sequence. I actually do not use gloves, just the goggles...

Rusty Dose
Team Futaba

I had been using a too small o/d TT spinner to allow cooling around the circumference of the spinner.
When the TT blew off I decided to try a GP because it's lighter and a heckova lot cheaper.
As far as cutting slots in the TT.....that would look pretty nifty and I would use one as long as someone else paid for it!
The look of the cut off GP spinner is kind of a no nonsense look.....I like it and the cooling really works.
Last week I flew with no problems in 102 temps here with high humidity.

Wow... Well you did a really nice job on the spinner, Rusty. I don't know if I say it looks cool but it doesn't look as bad as I had imagined. I could probably live with it, if I really needed to. I might even give it a try on my Wind 110.

+1. If they could machine some cooling holes, possibly even a fanning effect? Would be awesome. I like the TT F3A lightened spinners, even bought one for my electric Wind 110. Believe it or not, it's a few grams lighter than the plastic GP spinner.

if you look here at the page below, in a few pictures it shows Jason Shulman's spinner with vent holes. I was with Jas when he first started testing on the spinner and it seemed to have a significant drop in temperature all the way around. Also, if my memory serves me correctly I think the vented backplate had a fan shape to it.

post #65
http://www.rcuniverse.com/forum/m_98..._3/key_/tm.htm

Interesting... That's not what I'd envisioned but it looks pretty good.
Thanks!

I like it cause it does the same task and still keeps the shape of a spinner.

For outer-runner motors, I wonder if cooling through air scoops is also a good idea. I assume the scoops direct the air from the side of the fuse to the outside of the motor.

When I did the testing of the first spinner TT sent me, I was with Chris and had done 4 flights in the heat of the day. Here's what I sent TT about the results that I found.

So yesterday was really windy and about 93 degrees out... Perfect to testing cooling!

Basically, both spinner cones were about 100f after landing but turbo was 5 degrees cooler. Don't know if it's cause of the orange to silver but that doesn't matter really.

I then checked the backplate temps. The standard bp temps were 123 and 130/131. The turbo bp was 98. I'm not sure if that is a true reading as I only flew it once with the turbo bp so I'll have to check again.

Now the fun part... The motor temps. With the standard setup, motor was 202F. With the turbo cone, regardless of bp, 182F. 20 degrees F is a nice drop in temp.

I don't know what the status of the new spinners are as I haven't been home but a week since the Nats, but if I hear anything I will post it.

I am using a TT spinner cut for a four blade prop. The out side of my 30 – 10 Evo is no wormer than my finger after one round of P11. The spinner act as a fan.

Henning

Mission accomplished. I followed Rusty's drill press/razor saw method, except that when I got close to all the way through I started getting nervous and shut down the drill and finished the cut manually. That part took all of two seconds. Then I raised the table and laid a sheet of course sand paper and finished it per Dave Harmon's method then finished off with 180 then 400 wet paper.

Thanks to all that contributed.

Hi every one,
Same as my problum. I am fly E-F3A in Taiwan, it's hot and humidity weather here,
So we also need cooling spinner too
and i have one good idea of cool spinner share for every one.
maybe another day i'll do it one sample by(RP FDM).[img]

Someone earlier asked about data.
a couple of years ago Nat Penton did a test with a modified spinner to see if he could document an increase of airflow THROUGH the motor.
He cut the spokes of the lightened backplate to make a fan shape of them also.
Then he trimed the backplate and recessed it into the spinner so that the entire spinner mounted tight to the Plett motor.

This was mounted on a bench with the motor inside a sleeve and tubing connected to the sleeve. The tubing ran up vertical and held water so when he ran the motor he could record the increase air movement by pulling the water up the tube.

This is somewhat difficult to describe and I wish I had a picture to post but never the less he "proved" that cooling could be accomplished with a modified spinner.

Eddie

Andy, that is one cool looking spinner[8D]

Thank's matt13
I am keep on this idea come true
Used my company 3D printer do it one for test..
share picture for every one...
check it out..