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RE: Larger Revolver - 12/7/2012 9:03 PM   
markhamregular



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From: Pembroke Pines, FL, USA
Status: offline 		I would like to hear from those who have an OS 120AX 2 stroke on their Rev 70.
I thought the plane would be screaming but it's just OK.
I have to say the engine has only 10 flights so far, so not completely broken in.
I tried a 15-8 prop, but I did not like the speed, so I tries a 14-10. Same speed.
Someone told me the 120AX was underpropped for a 14, so I changed it to 15-10.
Still find the plane's speed just OK.

Anyone with 120AX our there with any suggestion. Thanks,




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RE: Larger Revolver - 12/7/2012 11:45 PM   
microdon2


 

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markham - what brand of prop are you using? There's a big difference in efficiency in brands of the same size. Props I would NOT use - Zinger, Master Airscrew. Good \ very good - APC. Better - XOAR, Vess. I'm sure there are more that I don't know about.

For that engine I'd think a 15x10 would be about right for speed, 16x8 for more vertical. Maybe the engine's not broken in yet, or it's not tuned just right. Are you sure you've got it dialed-in for maximum RPM's? You might also want to start a thread here on RCU on this engine.

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RE: Larger Revolver - 12/8/2012 1:19 AM   
JoeMamma



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quote:

ORIGINAL: markhamregular

I would like to hear from those who have an OS 120AX 2 stroke on their Rev 70.
I thought the plane would be screaming but it's just OK.
I have to say the engine has only 10 flights so far, so not completely broken in.
I tried a 15-8 prop, but I did not like the speed, so I tries a 14-10. Same speed.
Someone told me the 120AX was underpropped for a 14, so I changed it to 15-10.
Still find the plane's speed just OK.

Anyone with 120AX our there with any suggestion. Thanks,





mark,

Here's a great place to start http://www.rcuniverse.com/forum/m_3998256/tm.htm

Joe M.


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RE: Larger Revolver - 12/8/2012 2:22 PM   
markhamregular



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Status: offline 		Joe,
Thanks for the link. I have a tach but never use it. I will try so I can compare with others.

Micro,
I use APC props. They are my favorites. Someone suggested that I use the "Sport" line. I just cannot find any sport one the size I want. They don't make 15-10 Sport. So I use the "Pattern" line.

Thanks all,



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RE: Larger Revolver - 12/8/2012 2:22 PM   
wjcalhoun


 

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I had that combination on my first R70. The engine was well broken in, as it had flown quite a bit on another airframe. I flew an APC 15x10 and 16x8 prop with excellent performance, both on the vertical, and with figures and maneuvers.

My 'perception' is that the second R70, with DLE20, performs a bit better despite the same nominal displacement, and a few extra ounces of weight. My R70/DLE20 is now propped with an APC 14x12 and is QUICK.

My advice is to be patient until the 1.20AX breaks in. Tune the HS needle each day you fly, because weather conditions (temp, barometric pressure, etc) will change, and as the engine breaks in better, it will run well with a leaner HS needle and give you more RPM. It is an outstanding engine; starts reliably if you choke it. I am just using the standard OS #8 glow plug. I still have one pulling around my 1/4 scale Extra 260 (10.5#) very nicely even though it could have a 30cc gasser up front.

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RE: Larger Revolver - 12/8/2012 3:24 PM   
JoeMamma



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quote:

ORIGINAL: markhamregular

I would like to hear from those who have an OS 120AX 2 stroke on their Rev 70.

Anyone with 120AX our there with any suggestion.



mark,

As I mentioned in an earlier post, I have both a Hangar 9 Pulse 125 and a 70" Hangar 9 Ultra Stik that are both equipped with 1.20AX's. The 1.20 is a fairly large engine for any .60 size plane. The 1.20AX WILL eventually break in after about 2+ gallons have been run through it. Then it's a real powerhouse !!

Both these planes get thrashed pretty hard , and consequently I noticed some cracks and separation at the firerwall, so if I could recommend, make sure you do some reinforcement in that area. Just a little extra insurance.

Joe M.


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RE: Larger Revolver - 12/11/2012 3:35 AM   
orthobird


 

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Status: offline 		 hi, i am using a saito 125 4 stroke nitro engine, and the plane is a screamer.  top speed is 124 mph.

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RE: Larger Revolver - 12/11/2012 3:39 AM   
orthobird


 

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Status: offline 		where are the gurus?  i need your help.
went to take my revolver out to field, and noticed there was a problem with the elevators, it was 50 degrees F, and they were moving very very slow and with very little throw.
 
i then noticed inside that the pushrods were bent.  both elevator servos are in the canopy hatch area.
i will try to post photo.


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RE: Larger Revolver - 12/11/2012 4:00 AM   
microdon2


 

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Status: offline 		Orthobird - I'm guessing that's 4-40 rod? Was it working fine before and bent all of a sudden? If you don't have your pushrod going through the gray guide tube (and with 4-40 it probably wouldn't fit) you might want to reinforce with a carbon fiber sleeve. Or you can always move both servos to the back for minimal pushrod length.

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RE: Larger Revolver - 12/11/2012 4:31 AM   
Ernie Misner



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Status: offline 		Where are the guide tubes? They appear to be way too short, leaving the inner rod too long and flexible. It appears the guide tubes should at least be long enough to be glued into that last former that is visable. If I'm on the right track there are some fixes without actually having to replace the guide tubes. You could slip and glue carbon fiber hollow rod over the exposed pushrods to make them stiffer. Or at least epoxy some tiny eye bolts onto that last former for guides for the push rods.

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RE: Larger Revolver - 12/11/2012 12:10 PM   
Luchnia


 

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quote:

ORIGINAL: microdon2

Orthobird - I'm guessing that's 4-40 rod? Was it working fine before and bent all of a sudden? If you don't have your pushrod going through the gray guide tube (and with 4-40 it probably wouldn't fit) you might want to reinforce with a carbon fiber sleeve. Or you can always move both servos to the back for minimal pushrod length.

+1 Guide tubes important for this setup.

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RE: Larger Revolver - 12/11/2012 1:14 PM   
wjcalhoun


 

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Status: offline 		Quickest fix is probably to cover with carbon fiber tubes, as mentioned; put epoxy on the rod, and slide the tube over; very stiff and very light, and probably willl work. Actually with the carbon fiber, you MIGHT get away with 2-56 rod, instead of 4-40 rod, and save some weight.

My personal preference for this situation is just what microdon suggested: move the servos aft; build in two beams to hold the servos, fix the covering, and you are good to go. There are pictures of this kind of setup earlier in this thread.

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RE: Larger Revolver - 12/12/2012 2:19 AM   
Ernie Misner



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Status: offline 		Why don't other Revolver's have that problem with too much exposed pushrod?

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RE: Larger Revolver - 12/12/2012 2:49 AM   
ahicks


 

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Status: offline 		Many are gas, have the servos in back?

With nitro power though, that may cause a balance issue? I'm like the carbon fiber plan for that option...

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RE: Larger Revolver - 12/12/2012 4:00 AM   
wjcalhoun


 

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If you guys like the R70, as i do, you will LOVE the R90.
Maidened mine today (see the Revolver 50cc thread), and it flew beautifully.



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RE: Larger Revolver - 12/12/2012 4:04 AM   
microdon2


 

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wjc - would you say you enjoy flying the Rev 90 more than the other two Revolvers?

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RE: Larger Revolver - 12/12/2012 4:13 AM   
ahicks


 

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Status: offline 		Oh, man...
I'm REALLY trying hard to stay away from that thread......

I'm like microdon2, my car (CRV) would be bulging at the seams with that thing in it. I struggle with 30cc stuff. It's one of the reasons I like the 20cc stuff so much!

Congrats on the maiden though! Awesome!

one slightly jealous.....
-Al

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RE: Larger Revolver - 12/12/2012 4:17 AM   
microdon2


 

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Status: offline 		Al - though my CRV isn't the reason I'm not pulling the Rev 90 trigger yet - it's a budget thing. Plus I already have five planes on deck waiting to be built \ finished. (though that doesn't mean a SIXTH plane couldn't cut the line...)

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RE: Larger Revolver - 12/12/2012 4:32 AM   
wjcalhoun


 

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Status: offline 		Mike:
i cannot comment on the R59, which i do not have.
I only have one flight on the R90 so far, but it really is a beautiful flier. My R70 has become a speed plane now, with a 13.5 pitch prop. I'll have my eagle tree instrument package installed soon, so will be able to give some hard data on speed, g-forces pulled, etc.

Al - just leave the liftgate up!

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RE: Larger Revolver - 12/12/2012 4:38 AM   
ahicks


 

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Status: offline 		Oh, I didn't mean to imply you were using the CRV as an excuse. I am!

I should also mention I've been distracted a bit with a flying side trip into electric foamies - the EPP 3D profile variety? I haven't flown electric since I stuffed an .05 in the sawed off nose of a Gentle Lady when the electrics were in their infancy - 30 years ago? Well, anyway, this low and slow stuff that recently claimed my OMP Fusion (Mojo 65 kit on it's way too) has me wanting to get better at that, AND lower and slower - and this stuff is letting me do that on the cheap! I've built and flown a 43", have a 48" on the bench, and a 6-7oz (with battery!) super lightweight 36" for some indoor flying I hope to be doing soon! Power to weight similar to gas (yes, stupid power!), but much smaller and slower allowing for flying in a smaller area. Plus, they're nearly indestructible. If you do manage to tweak one, all mine are made from EPP foam - which works well with about any glue, including CA. That, and when they break, they do so cleanly. You just stick the parts back together, CA them, and you're back in the air again... -Al

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RE: Larger Revolver - 12/12/2012 5:48 AM   
Ernie Misner



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Status: offline 		You are smart to be practicing with the foamies Al. I need to follow in your footsteps more. You will be flying circles around us!

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RE: Larger Revolver - 12/12/2012 7:00 AM   
microdon2


 

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Status: offline 		Al - I've been thinking about a cheap 3D foamie myself. Those things look like TOO much fun, and a safe way to learn 3D.

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RE: Larger Revolver - 12/12/2012 2:06 PM   
ahicks


 

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Status: offline 		Just one caution? They're priced where they can be pretty addictive!

Here's a link to the one I have flying. You can get it as an ARF or as a "kit" where you pick out all your own electronics. That's the way I went, making a lot of mistakes with gear that's heavier than necessary - part of learning what's going on with these things. Pretty popular plane. Note it's 15% off for the next couple days....

The arf:
http://www.nitroplanes.com/02a-008-1100mm-yak54-3d-epp-arf.html

The kit
http://www.nitroplanes.com/02a-008-1100mm-yak54-3d-epp-kit.html

Kit also available at
http://www.hobbyking.com/hobbyking/store/__17521__Hobbyking_Yak_55_3D_1096mm_EPP_ARF_.htm

Note also this plane has a wing loading and enough PRE INSTALLED carbon fiber that it does not require calm weather! PM regarding further suggestions. So far off topic with this, but thought there might be some interest here...

One last note and I'll quit. Landings can be quite interesting/different due to the TOTAL lack of momentum. You're used to pulling the power then gliding deep into the flare? Not the plan here. They just stop! Buy extra props! You'll need them getting used to that....

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RE: Larger Revolver - 12/12/2012 5:48 PM   
Slow and Steady


 

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Status: offline 		Ahicks, I have been having the same exerience with a 48" epp edge. What a blast, but like you I am eating prop tips, with the different stall character. But what a blast. It will elevator in and fly like a feather, but the ESC sent with the package deal didn't work. So stick with the arf and by the electronics from Hobby King. Here is my source and a link to a You Tube video

http://www.bestvaluerc.com/shop/shopexd.asp?id=363

http://www.youtube.com/watch?v=12BAPs0NnE0

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RE: Larger Revolver - 12/12/2012 10:33 PM   
ahicks


 

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Status: offline 		S&S, you meant to say buy the kit, then spec. out your own electronics? Or did you mean to say ARF as you wrote?

That slow flying in the video is about where I'm at, what I'm screwing with. Lots of high alpha and pretty much the same thing, only on knife edge. Whoever that is, is ahead of me by a bit. I'm not that smooth - he's making it look easy!

The chin of my plane is taking a beating.... and the wing tips. A couple of small chunks missing - and grass stains/dirt. Nothing really broken though? Nothing but props, I've lost track of how many props I've used.
-Al

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