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Old 10-31-2019, 05:43 PM
  #43226  
Glowgeek
 
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How did I know that was coming.

The thickness is key, I think, to keep the linkage from wobbling in the throttle arm hole. Thicker , like almost the width of a clevis is great. Brass is stylin', very nice touch.
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Old 10-31-2019, 06:46 PM
  #43227  
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here you go guys, I only read 3 of these. keep an eye on the Nitro percentages
I do know one thing for sure, I want a Saito 91 for my ShoeString !!

Saito 115,
http://www.rcuniverse.com/forum/tach...ito-115-a.html

Saito 100,
http://www.rcuniverse.com/forum/tach...ease-post.html

http://www.rcuniverse.com/forum/tach...aito-100s.html

http://www.rcuniverse.com/forum/tach...s-w-15x6w.html

http://www.rcuniverse.com/forum/tachometer-readings-173/3043133-what-props-saito-100-a.html

notice the first reply,
http://www.rcuniverse.com/forum/tach...-1-00-rpm.html

http://www.rcuniverse.com/forum/tach...0-numbers.html

http://www.rcuniverse.com/forum/tach...-4-stroke.html


Saito 100 on 30%
http://www.rcuniverse.com/forum/tach...li-15x6ma.html

a bunch of Saito 100 prop talk,
http://www.rcuniverse.com/forum/tach...ito-100-a.html

Saito 91,
http://www.rcuniverse.com/forum/tach...-readings.html

http://www.rcuniverse.com/forum/tach...to-fa91-s.html

http://www.rcuniverse.com/forum/tach...-91-15x4w.html

http://www.rcuniverse.com/forum/tach...-apc-14x6.html

http://www.rcuniverse.com/forum/tach...aito-91-a.html

http://www.rcuniverse.com/forum/tach...ito-91-fa.html


Saito 82,,
http://www.rcuniverse.com/forum/tach...to-fa-82a.html

http://www.rcuniverse.com/forum/tach...saito-82a.html

http://www.rcuniverse.com/forum/tach...saito-82a.html

Jim
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Old 11-01-2019, 01:22 AM
  #43228  
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Originally Posted by Glowgeek
I like the plastic throttle arms, nice tight fit using a dubro metal clevis. Good idle rpm accuracy.
Plus 1.

Dave the saito manuals we get here listed a 15x8 as the biggest prop for the fa115, i like to keep the rpm down to around 9000 on the ground. I used a 15x8 mas and top flying rpm was 8500 on the ground with absolute max rpm 8900. Fitted to the slippery midget mustang that was the prop that would rip in the air, sometimes you would get what sounded like a loud sonic boom from the prop tips in a dive. The same plane was much quicker with a mas 14x10 s2 q tip. Since all my fa82's are in arf 46 size decathlons now it's been fun to try lots of different props wooden zingers and xoars etc but for outright flying performance an apc 14x6 smashes them, you can hover with them at full throttle but a wooden 14x5 wide blade was more fun for that. The apc plastic prop is heavy compared to wood so flying the decaff with a light wooden prop moves the cog back in to flat spin territory which is entertaining. A 5 pitch revs the engine to hard for normal scale flight tho.
Last edited by Rudolph Hart; 11-01-2019 at 01:33 AM. Reason: cog
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Old 11-01-2019, 01:33 AM
  #43229  
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I have two of the plastic arms fail in me. It’s probably my set up but I also have steel arms that are twice as old and are still good.
and yes brass would be cool.
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Old 11-01-2019, 01:47 AM
  #43230  
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Originally Posted by Captcrunch44
I have two of the plastic arms fail in me. It’s probably my set up but I also have steel arms that are twice as old and are still good.
and yes brass would be cool.

I have only had one plastic arm fail. I pay a lot of attention to linkage setup and alignment and this one was quite a surprise. It was on a Saito 62 in a Toledo Spl on maiden flight. I at first thought it was a servo. Flew out the tank at full throttle, landed when the engine died. The arm had simply broken.
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Old 11-01-2019, 02:32 AM
  #43231  
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Crunchy, Gary, did your plastic tthrottle arms break using a ball link, clevise or z-bend?
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Old 11-01-2019, 02:41 AM
  #43232  
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Originally Posted by Glowgeek
Crunchy, Gary, did your plastic tthrottle arms break using a ball link, clevise or z-bend?
on one I used a z bend. It ripped all the holes out and after flying the plane a few times I noticed that the arm had become soft almost like the fuel was softening the plastic the other arm fell off in my hands I’m not quite sure what happened to that I was working a throttle to loosen it up and it literally just fell apart so I put a metal one on there and I will put a metal one on the one that softened and rip the holes out
I got luck and found someone selling a few steel arms and bout all he had.
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Old 11-01-2019, 02:43 AM
  #43233  
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Originally Posted by Glowgeek
Crunchy, Gary, did your plastic tthrottle arms break using a ball link, clevise or z-bend?
I think they were using the s bend
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Old 11-01-2019, 02:49 AM
  #43234  
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Yeah the “S” bend is way better lol
I don’t normally do that on the throttle but I have done this technique on steel arms and it works fine I just know now I can’t do that on the plastic arm
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Old 11-01-2019, 02:49 AM
  #43235  
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This is

Sullivan flex cable with a Dubro setscrew fitting. The Toledo has plenty of room for a smooth connection.

The very few installations (2 or 3) where I used a "U" bend were years ago. Before the plastic arms were used. No problems there.
Last edited by Jesse Open; 11-01-2019 at 02:55 AM.
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Old 11-01-2019, 02:53 AM
  #43236  
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That is one thing it’s a tight fit where I used the Z bend but I think I can get a easy connector in there just gonna take some time
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Old 11-01-2019, 02:59 AM
  #43237  
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I have seen a few plastic arms (Saito) that had peeled off from their metal hubs. Dont know how or why, they were on used engines .
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Old 11-01-2019, 03:04 AM
  #43238  
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The plastic arms are not as flexible as one would think (it's not nylon). I broke one on the bench trying to get a z-bend in by drilling the hole with the wire end. The wire drilled through just fine but the arm cracked when I tried to get the bend through. Since then I drill the holes out and use a ball link or clevis.
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Old 11-01-2019, 03:09 AM
  #43239  
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I have read a few comments on the push rod for the throttle and they have been saying the cable or golden rod to be better for vibration then a solid rod. Besides the cable is a lot easier to work with
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Old 11-01-2019, 03:21 AM
  #43240  
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I never use "Z" bends on throttles, either a ball link or DuBro set screw type. Minimal slop.
Sullivan Gold'N Rod type flex cable.
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Old 11-01-2019, 03:43 AM
  #43241  
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Aquarium tubing with weedeater line inside works great for flex cable too. Sized correctly the weadeater line screws into a clevis quite securely. The line is a little stiffer than golden rod cable and way cheaper.
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Old 11-01-2019, 03:59 AM
  #43242  
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Smooth and friction free.
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Old 11-01-2019, 04:12 AM
  #43243  
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Rarely seen, for good reasons.
Every pivot point adds friction. As well as room for slop.
A straight cable works great, less friction, less slop, fewer parts Win, win , win.
Last edited by Jesse Open; 11-01-2019 at 04:16 AM.
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Old 11-01-2019, 04:14 AM
  #43244  
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Originally Posted by Glowgeek
Aquarium tubing with weedeater line inside works great for flex cable too. Sized correctly the weadeater line screws into a clevis quite securely. The line is a little stiffer than golden rod cable and way cheaper.
Are you talking about the nylon line, or is it metal?
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Old 11-01-2019, 04:15 AM
  #43245  
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Delete, site repeat.
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Old 11-01-2019, 04:15 AM
  #43246  
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No slop at all.
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Old 11-01-2019, 04:17 AM
  #43247  
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Originally Posted by Jesse Open
Are you talking about the nylon line, or is it metal?
Plastic aquarium tubing and nylon weedeater line.
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Old 11-01-2019, 04:25 AM
  #43248  
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I like to use the straight Music wire but that is hard to do on some models.
the weed eater line sounds cool you can buy that stuff in 100’ rolls cheap.
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Old 11-01-2019, 04:26 AM
  #43249  
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Originally Posted by Hobbsy
No slop at all.
Sure there is. All the pivots and linkage connection require operating clearance. More pivots just add the clearances. And they wear from there with use.Likewise with drag, it all adds up.
You could flip the throttle arm down, put a ball link on the end of a flex cable and toss that Rube Goldberg stuff back in it's bag

Less friction, less slop.

Sorry Dave, used one of those things when DuBro sold them. One time, never again. Just more "stuff" that does not solve anything in most cases.

OK Lonnie, Sounds like a good tip.
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Old 11-01-2019, 04:41 AM
  #43250  
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It's not a DuBro, it's my own make up. Different is not automatically wrong.
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