New Convair Pogo - Page 3

SilentHunter · Jun 26, 2009, 09:52 PM

I gearing back up to start continuing work on the Pogo.

I need a machine shop to make the special shaft for the motors, anyone know of a good reliable one who doesent charge a fortune that you can recommend? it's a simple deal stepped shaft, 10mm x 5" long SS shaft turned to 6 mm in the center, so half is 10 mm and the other 6mm.

Also, I was planning on using the Zinger 3 blade systems for the props, but they are REALLY heavy built! i need 19-22" 3 blades.

They certainly dont have to be built as beefy as the Zinger hubs, since I estimate they will only turn in the 3500 rpm range..I guess i have to make my own hubs and use the zinger blades.

Any ideas on this stuff?

Im was also thinking of a sliding battery "trolley", that can make the CG extreme aft for hovering ease, then slide forward for forward flight...

SilentHunter · Jun 26, 2009, 10:58 PM

Holy smokes, Himaxx got all the CR motors in stock and shipping!

http://www.maxxprod.com/mpi/mpi-266.html

I just emailed them, to see if the 50mm CR motors can deal with 20"x6 props.

The 50mm would be more practical, and if can turn a large low pitch prop then my problems are over, at least in that department

I think maybe the 63mm series, like i was going to make with the two motors I bought, is overkill in power... I knew that, but not enough power in a vtol is bad.

We'll see, what u think?

lphan · Jun 29, 2009, 08:13 AM

SilentHunter,

I just saw this thread. Very impressing plug and fuselage ! I like the rivets.

Keep up the great work ! I actually tried a simulator of the Pogo at my hobby shop on Saturday. The thing that I was not used to is the hovering part where I had to use down stick to move the plane forward.

Cheers,

Le

SilentHunter · Jun 30, 2009, 02:48 AM

Hey thanks man

I hope i can get the time to do more work on it in the next few weeks.

it needs a variable CG, and gyros.

bruff · Jun 30, 2009, 02:49 AM

Any chance of getting a fuselage?
Bob

Brandano · Jul 01, 2009, 09:16 AM

Quote:

Originally Posted by SilentHunter

Im was also thinking of a sliding battery "trolley", that can make the CG extreme aft for hovering ease, then slide forward for forward flight...

That will not work as you think. Shifting the CG backward might help in the transition, since it will allow you to pitch up over the stall with greater ease. However, once in the hover if your CG is too close to the control surfaces you will not have enough control authority. The pendulum effect, as we have discussed several times, is an illusion (the plane does not "hang" from the prop), but the moment arm between the control surfaces and the CG is not.

quenda · Jul 01, 2009, 01:07 PM

If this THING can fly (not too bad I.M.H.O):

http://www.rcgroups.com/forums/showthread.php?t=449262

.........I suppose that your bigger POGO can fly too.
Just keep the weight as low as possible and go with a lot of WATTS

And the "sliding" battery for C.O.G. correction is a great idea.

Keep on going with this project....you're my hero!

ettore

SilentHunter · Jul 01, 2009, 09:20 PM

Bob,

I have to mold it first, when I do I'll let you know and you can get one. You want to try and make a flying one? Display?

It is meant for dual purpose, display and or flying

brandano that is correct. I was not thinking of moving it that drastically. But too tail heavy for forward flight would help I think in hovering... to what extent is unknown, as with a lot of thing on this model right now

We'll find out.

SilentHunter · Jul 01, 2009, 09:22 PM

Thank you Ettore.

EDDIEGIGOWATTS · Jul 05, 2009, 01:00 PM

SilentHunter
hope this helps
here is a pic of a better set up ,
you can keep the shaft the same diameter
a simple spacer with bearings bolted to the front of the bell
think by reducing the shaft your going to have complications

SilentHunter · Jul 09, 2009, 06:58 PM

Thanks Eddie, yep thats a good idea. I do like it better than my own, but that bearing housing is harder to machine than a simple stepped shaft. But fortunately....

Himax is actually selling their bigger CR setups, I wont be needing to make anything but the spinner, which is a big enough problem.

degreen60 · Oct 07, 2009, 11:53 PM

I just found this thread and thought you might like to see these pictures I took in 1961. I thought some day I might try making a flying model.

turbodriven · Oct 17, 2009, 05:49 PM

Mines not as pretty as yours... and it's not contra-rotating (yet) but it does fly. I'm working on the landings still though

IMGP2739 (1 min 12 sec)

EDDIEGIGOWATTS · Oct 17, 2009, 06:50 PM

waaay toooo cooolll
Turbodriven very nice
there is plenty of CTR motors out there for that size Pogo

Eddie

Basingstoke Roy · Oct 18, 2009, 06:34 PM

Quote:

Originally Posted by EDDIEGIGOWATTS

SilentHunter
hope this helps
here is a pic of a better set up ,
you can keep the shaft the same diameter
a simple spacer with bearings bolted to the front of the bell
think by reducing the shaft your going to have complications

Hi Eddie

I can vouch for that set up, but if you have the space fit the adapter from the rear, with the bearing as close to the windings as possible. This helps to reduce the length of the shaft and the amount of movement (slop) on the aft edge on the outrunner, and the danger of it hitting the stator. Caused by the flex in the shaft & float in the bearings.
click link to see some picture of how I did it

RC Groups contra rotating prop brushless

As for a spinners, the easiest & quickest way I've found is to carve them from blue foam, with ply mounting plates and then add a small vac formed plastic spinner at the front, or top in your case

I'm looking forward to seeing the finished article

Jul 05, 2009, 01:00 PM	#40
EDDIEGIGOWATTS 1.21 gigawatts Join Date: Jul 2006 Location: Fort.lauderdale Florida Posts: 634	SilentHunter hope this helps here is a pic of a better set up , you can keep the shaft the same diameter a simple spacer with bearings bolted to the front of the bell think by reducing the shaft your going to have complications Attached Thumbnails 72.6 KB · Views: 126 71.5 KB · Views: 127

Oct 07, 2009, 11:53 PM	#42
degreen60 Registered User Join Date: Nov 2006 Location: Bloomfield, IN Posts: 299	I just found this thread and thought you might like to see these pictures I took in 1961. I thought some day I might try making a flying model. Attached Thumbnails 42.9 KB · Views: 52 102.5 KB · Views: 45 55.0 KB · Views: 37

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Jun 26, 2009, 09:52 PM	#31
SilentHunter under construction Join Date: Aug 2003 Location: Green valley AZ Posts: 998	I gearing back up to start continuing work on the Pogo. I need a machine shop to make the special shaft for the motors, anyone know of a good reliable one who doesent charge a fortune that you can recommend? it's a simple deal stepped shaft, 10mm x 5" long SS shaft turned to 6 mm in the center, so half is 10 mm and the other 6mm. Also, I was planning on using the Zinger 3 blade systems for the props, but they are REALLY heavy built! i need 19-22" 3 blades. They certainly dont have to be built as beefy as the Zinger hubs, since I estimate they will only turn in the 3500 rpm range..I guess i have to make my own hubs and use the zinger blades. Any ideas on this stuff? Im was also thinking of a sliding battery "trolley", that can make the CG extreme aft for hovering ease, then slide forward for forward flight...

Jun 26, 2009, 10:58 PM	#32
SilentHunter under construction Join Date: Aug 2003 Location: Green valley AZ Posts: 998	Holy smokes, Himaxx got all the CR motors in stock and shipping! http://www.maxxprod.com/mpi/mpi-266.html I just emailed them, to see if the 50mm CR motors can deal with 20"x6 props. The 50mm would be more practical, and if can turn a large low pitch prop then my problems are over, at least in that department I think maybe the 63mm series, like i was going to make with the two motors I bought, is overkill in power... I knew that, but not enough power in a vtol is bad. We'll see, what u think?

Jun 29, 2009, 08:13 AM	#33
lphan Registered User Join Date: Apr 2003 Location: Canton, MI Posts: 692	SilentHunter, I just saw this thread. Very impressing plug and fuselage ! I like the rivets. Keep up the great work ! I actually tried a simulator of the Pogo at my hobby shop on Saturday. The thing that I was not used to is the hovering part where I had to use down stick to move the plane forward. Cheers, Le

Jun 30, 2009, 02:48 AM	#34
SilentHunter under construction Join Date: Aug 2003 Location: Green valley AZ Posts: 998	Hey thanks man I hope i can get the time to do more work on it in the next few weeks. it needs a variable CG, and gyros.

Jun 30, 2009, 02:49 AM	#35
bruff Team EJF Team Hacker Join Date: Jun 1999 Location: Gilbert, Az Posts: 5,286	Any chance of getting a fuselage? Bob

Jul 01, 2009, 01:07 PM	#37
quenda Registered User Join Date: Aug 2005 Location: Piacenza, Italy Posts: 130	If this THING can fly (not too bad I.M.H.O): http://www.rcgroups.com/forums/showthread.php?t=449262 .........I suppose that your bigger POGO can fly too. Just keep the weight as low as possible and go with a lot of WATTS And the "sliding" battery for C.O.G. correction is a great idea. Keep on going with this project....you're my hero! ettore

Jul 01, 2009, 09:20 PM	#38
SilentHunter under construction Join Date: Aug 2003 Location: Green valley AZ Posts: 998	Bob, I have to mold it first, when I do I'll let you know and you can get one. You want to try and make a flying one? Display? It is meant for dual purpose, display and or flying brandano that is correct. I was not thinking of moving it that drastically. But too tail heavy for forward flight would help I think in hovering... to what extent is unknown, as with a lot of thing on this model right now We'll find out.

Jul 01, 2009, 09:22 PM	#39
SilentHunter under construction Join Date: Aug 2003 Location: Green valley AZ Posts: 998	Thank you Ettore.

Jul 09, 2009, 06:58 PM	#41
SilentHunter under construction Join Date: Aug 2003 Location: Green valley AZ Posts: 998	Thanks Eddie, yep thats a good idea. I do like it better than my own, but that bearing housing is harder to machine than a simple stepped shaft. But fortunately.... Himax is actually selling their bigger CR setups, I wont be needing to make anything but the spinner, which is a big enough problem.

Oct 17, 2009, 06:50 PM	#44
EDDIEGIGOWATTS 1.21 gigawatts Join Date: Jul 2006 Location: Fort.lauderdale Florida Posts: 634	waaay toooo cooolll Turbodriven very nice there is plenty of CTR motors out there for that size Pogo Eddie