Servo Questions
 

Ok, I have a question that could be answered very easily. I was wondering if JR servos have the same output shaft as a Hitec servo? My problem is that I am building a showtime 90 and Want to use the hangar 9 aluminum servo horns but I cant justify spending over $100 on JR servos when I can get the same performance from Hitec for much less.

RE: Servo Questions
 

Unfortunately, no.

BUT...in a .90 size plane, the DuBro extra large servo arms for Hitec will work OK. I think they are around $12.

The JR titanium arms are the best, but they will not fit Hitec servos.

RE: Servo Questions
 

darn...that makes sense though. They make thier own servo out put shaft so if you want to use thier arms you have to use their servos. Will the plastic ones hold up on the showtime 90?

RE: Servo Questions
 

I have over 50 hours of transmitter time on my ST .90. I switched the JR SM125s with titanium arms out for Hitec digitals with DuBro arms. Not a problem...except I have lost both elevator halves, the rudder and one aileron to hinge failure over several gallons of glow fuel with no crashes (whew).

The plastic arms are strong enough for a .90 size plane, but I would not go much bigger. If you run 3D throws, be sure and use the larger arms.

The ST .90 is a GREAT airplane!!

RE: Servo Questions
 

can't speak for the HiTec servos, i only use JR equipment, but the stock 'plastic' horns included with JR servos are plenty strong enough for any installation. I've used them on all surfaces of 200+ mph turbine jets with absolutely no problems and even Bob Violet (another JR flier) recommends them for all his jets.

kc

RE: Servo Questions
 

thanks for the info agexpert. I just feel like I get more for my money with the Hitec servos. What servos are you running in your ST 90? I have the rudder servo already; HS-5645MG. I figured it would have enough torque at 6.0v. I cant decide between an OS 1.20 or a Saito 1.25 for it..any suggestions in that department?

RE: Servo Questions
 

I am running the same servos, (except an 8611a on rudder), and a Saito 1.25. The OS is not enough and is a bit heavier. One of my flying buddies used it. The 1.25 with a 16 x 4W is BARELY enough to pull out of a hover. I would look at YS for 3D pullout.

I use a Fromeco 7.4V 2s 2400 pack and a Fromeco reg. for power. NiMH's will be fine at 6V, just more weight.

This is my last glow plane and I will keep it around, (in fact I have another ST .90 ARF built and ready to go for the gear that's in my current ST .90). I have pretty much moved to gas. There is no comparison. BUT, ....my ST .90 is the plane that worked-up the confidence to fly multi-thousand dollar toy airplanes....PLUS a lot of help from my freinds.