Zoar e Props

[F1 Rocket]

I just got some new Zoar e props and the hole in the hub is 10mm. The first one I bought a while back was 8mm. Is 10mm normal now or did I get some props with the wrong sized hole?


Danny

[kmp647]

When I inquired months ago Zoar responded 10mm on the center hole

thats why I never bought one

they will listen it needs to be 8mm

[F1 Rocket]

When I inquired months ago Zoar responded 10mm on the center hole

thats why I never bought one

they will listen it needs to be 8mm


I just checked and the one I have on my EF Yak has a bushing in it. I got it from a friend of mine and never noticed it :o

Not much problem to make some bushings but it would be easier if they didn't start out with a 10mm hole. The hubs could use to be a bit thinner as well.


Danny

[Fool]

To bad they stopped at the 24x10.
I need a 24x12.

Had a hard time finding a bushing too.

[Ed Lyerly]

I had the same problem with the 10MM prop hole and 8MM motor shaft. I was able to fit some pieces of K&S brass tubing to make the proper size bushing. Then I just glue it in the prop opening.
Ed

[Fool]

Ed,
I looked everywhere locally, then on-line, no joy.
Then found out that I had the bushing in hand all along.
Its the stab tube on my AirWild 29% Edge. So I ordered a spare tube,
can't remember what I paid for it. It was worth it, a perfect fit.

Jim

[Chuck McHugh]

I get xoar props from the U.S. distributor http://www.bobshobbycenter.com/ and Xoar has been good about responding to customer comments. I had the same problem with 17" props. Returned it with a complaint and next shipment they came with 8mm holes.Bottom line, let Steve know about the problem it might be fixable.
Chuck
BTW I don't work for Bob's hobby center but I do work because of them:)

[hawaiianspork226]

lol but I do:)

we had a similar problem on the smaller electric prop range too; the 12x7 had a smaller size hole than the 11x5 did, same with the 10x5. I did find however that the APC prop adapter inserts fit the larger hole; convenient but you still need to buy the APC props lol

the problem was fixed too with the smaller props, however i was unaware of the problem with the larger props. Ill tell Steve about it tomorrow. Last time the problem was resolved with the next shipment; theres no reason it cant be with the next one.

-David
on behalf of XOAR / Bob's

[F1 Rocket]

I finally had a chance to fly back to back tests with an APC 20x8e and Zoar 20x8e on my EF 74" Yak. I'm surprized to say this but on my particular setup I prefer the APC. The Zoar pulled about 10 amps less than the APC and seems to have a bit more pitch speed but the APC was quieter and the airplane had a lot better climb performance. This is the opposite of what I was expecting.


Danny

[Tipover]

Got my Xoar 21x10. Looks very nice, very much like a wood copy of a APCe :D I also have the dreaded 10mm hole to deal with. I'll be testing this back to back with my APCe 20x10 on my Hacker A50 10s1p A123 setup.

Kevin

[Tipover]

In my IC junk box I found an otherwise useless spinner adaptor nut that threaded on my 8mm motor shaft. Also has a 10mm outside sleeve. I hacked the end off and it press fits right inside the Xoar prop. If you're using a Tru Turn spinner you may not have to hack it off :cool:

Kevin

[Tipover]

Last night around 7:30pm (its now about 1:30am Thursday) I tested the Xoar 21x10 back to back with the APCe 20x 10 and recorded the flights with the Eagle Tree micro power. Very interesting results I think. At about .5 minutes into each test you can see a WOT static run up on the ground. To get some idea of a constant, I decided to compare power required to hover just above the gound. In the Xoar graph you can see what a power-off wall, into a hover looks like at around 4.5 minutes. The Hover current seems to average right around 25 amps and 29 volts for around 725 watts. The current spike and voltage sage following is a full power pull, straight up from hover.

On the APCe 20x10 graph you can see a similar hover going on at about 5.5 minutes into the flight. If I'm seeing things correct, the average current seems a bit higher at around 27-28 amps, while the voltage looks to be still about 29v for closer to 800 watts.

The Xoar had a noticably faster pullout from hover. I performed the two flights about 15 minutes apart to allow the motor to cool a little. Outside temp was about 85 F with a dewpoint around 75, very uncomfortable flying weather for WI. Both flights used separate fully charged 10s1p A123 packs. Its possible the warm motor affected the second readings some. I can reverse the process next time out. To bad I had the rpm sensor plugged in wrong on both flights, so no rpm data :o

While my Hacker A50L is not exactly a giant size setup, I thought the Xoar electric to APCe prop comparison might be of some interest. I only wish Xoar had a 20x10 prop for a more direct comparison.

[edit] Changed hover voltage from 25 to 30 volts in the above text. Was obviously half asleep first time around reading the graphs. The Xoar prop is looking pretty good :)

Kevin