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HelicopterAudacity Models P6 Pantera - Tiger 50 › Gear ratio in 70 powered Pantera?
03-21-2009 07:14 PM  8 years agoPost 1
petmotel

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DeKalb, IL.

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In anticipation of my Pantera which will be showing up on Monday, I have some questions.

One of the Panteras will be powered with an OS 70, I already have the 86 tooth main gear and 11 tooth pinion for the 7.82 gear ratio. Does this work out better than the stock ratio with the 70?

Also curious how the TT gear set has been holding up. Anybody got some serious flight time on the 7.82 gear set? Does it live long and prosper?

Jay

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03-21-2009 07:19 PM  8 years agoPost 2
ProModeler

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Sanford, FL (Orlando​area)

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Works very well. Seems to be holding up fine too. Contact Dude II for assistance.


John Beech
AMA # 47381
IRCHA #745

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03-21-2009 08:50 PM  8 years agoPost 3
Mr.HillBilly

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Salesville, OH - USA

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I am using that on my 61 it works great. You will need to make up 4 spacers for under the main gear to raise it just a little higher. I will pop one of mine out, I think it is about .080"

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03-21-2009 09:00 PM  8 years agoPost 4
petmotel

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DeKalb, IL.

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Contact Dude II for assistance.
"Yes, and stop at the gas station and get directions, I believe you're lost" says the wife. "No" says I, "a manly man don't need no stinkin' directions" LOL, famous last words to live by.

In all seriousness, thanks so kindly for the help guys!

Jay

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03-21-2009 11:29 PM  8 years agoPost 5
The Dude II

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IN - USA

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OS -70 really drinks the fuel @ 8.7:1 (stock)

@ 7.82:1 you gain about 1 minute at 1850 HS and I think/feel the engine is really in the power-band.

As Mr HillBilly put it...washers to raise the main gear on the auto hub.

When you go to load the pinion onto the clutch bell...use the supplied washer with the pinion...be sure to place it between the bell & pinion; Failure in my case lead to excessive bell wobble (like .020" .

Believe James Lerch put up a video here on RR.

I JB-Welded the bearing to the pinion.

At this point I have just under an hour of flight time on this gear ratio/ flybarless setup.

Final note...I did notch the engine mount "rails" on the frames such that the engine/clutch mated squarely with the bell. This may have been particular to my BBC kit as I think it was one of the first...mid-season 08 from JB.

It'll pull 600mm blades HARD!

http://www.runryder.com/helicopter/t450192p1/

lotta ins, lotta outs

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03-22-2009 12:18 AM  8 years agoPost 6
Mr.HillBilly

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Salesville, OH - USA

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I just pulled mine out and I am using .060" washers. You prob. could get away with .075" to .055". Just put them between the hub and the bottom of the main gear. If you are too short you will rub the frame, if you are too tall you will rub the gear above.

Gus came up with the idea of putting the washer for the pinion on the top of the pinion under the bearing. I myself have had good luck with that way. A thrust washer from another motor works great.

I would JB Weld the bearing also, I have never had much luck with the lock-tite on these pinions.

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03-22-2009 12:22 AM  8 years agoPost 7
petmotel

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DeKalb, IL.

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Thanks for the info Dude ll! I assumed the 70 should have enough torque not to need the 50 gears, but I didn't consider the fuel economy issue.

I bought the gear set after reading J.L.'s posts, hoping it would work on a different brand of 50. After actually starting the project, I realized that JBs assertions of an airframe designed from conception to accept a 60-90 engine was a far superior solution. I abandoned the original project, the engineer in me forwarned of cooling, and probably clutch troubles with that effort.

I've always held with the notion that too much power is just about right . I'm really looking forward to getting this thing airborn! Thanks for the irresistable sale JB!

Jay

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03-22-2009 06:10 AM  8 years agoPost 8
The Dude II

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IN - USA

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OK...Went down to look at what I did on this...not just from my shaky memory!

First, the supplied washer that comes with the pinion was used between the pinion & bearing in this case.

2nd, the washer between the pinion & bell was one that I created...pain-in the butt...but that's what we modelers do!

3rd, the washers (4) used to raise the main gear on the hub were .023"...came from the Pantera kit(s) .

4th, notice that the auto hub has the Brass washer showing...there is another brass washer behind it that's about .015" that raised the entire hub.

In conclusion, raised the main gear about .035" to .040" and centered the pinion by stacking washers on either side.

Please ignore the servo arm balls at 16mm...hold-over from the 9252s.

lotta ins, lotta outs

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03-22-2009 01:34 PM  8 years agoPost 9
Mr.HillBilly

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Salesville, OH - USA

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Gus you keep your bird too clean. Mine only looks like that B4 I start it for the first time.

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03-22-2009 03:00 PM  8 years agoPost 10
petmotel

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DeKalb, IL.

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The Dude II, thank you for taking the time, and effort to explain exactly what was done to make the gearset fit correctly. Awesome! That information will save me quite a bit of trial fitting for certain.

Jay

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03-22-2009 04:44 PM  8 years agoPost 11
The Dude II

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IN - USA

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Glad to!

Share the wealth (or Knowledge).

Should put this with the other 'nugget' post...but since we're talking about setups & sharing experience:

http://www.rcprecisionheli.com/inde...basic_settings/

& a podcast that goes right along

http://media.libsyn.com/media/insid..._Flying-PSC.mp3

lotta ins, lotta outs

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