yep, right on Scott. moving the pullies on the servo arms would have reduced my mechanical advantage. on the other hand.......instead of moving the bellcrank position like i did, i could have moved the pullies on each servo in toward center one hole on both sides of every servo. that would probably give me even more torque for the same amount of reduced throw. its hard to know for sure with a cable system and 4 servos. its working well as is, so im not going to jack with it anymore........."if it aint broke, dont fix it"

Boy! If most of us followed that simple rule of "if it aint broke, dont fix it" We all would be bored with our planes. Always tweaking to make it fly better.

Originally Posted by pryor808

I was thinking the same thing. I wonder the lentgh on his servo arms?

Here are the pictures of the servo arm on my 72" 3DHS Extra, look how tiny the servo is compare to the control surface...

I called my sponsor up and they sent me couple of new servos to test, new servo is Digital, Titanium gear called "Fi Tec" (ya, I know the name sucks but it's free). It suppose to deliver 257oz@6 volt, that translate to 100oz more than my current HiTec 7985MG.

Will give it a shot and also shorten the servo arm to see what's up.

Originally Posted by pryor808

Boy! If most of us followed that simple rule of "if it aint broke, dont fix it" We all would be bored with our planes. Always tweaking to make it fly better.

oh ya, tell me about it, I was born to be an engineer.

Originally Posted by JackRC

Here are the pictures of the servo arm on my 72" 3DHS Extra, look how tiny the servo is compare to the control surface...

I called my sponsor up and they sent me couple of new servos to test, new servo is Digital, Titanium gear called "Fi Tec" (ya, I know the name sucks but it's free). It suppose to deliver 257oz@6 volt, that translate to 100oz more than my current HiTec 7985MG.

Will give it a shot and also shorten the servo arm to see what's up.

Please take a side shot of the link when the surface is centered and at full throw. Looks to me like you need the link on the back side of the servo arm. Alot of guys set them up the way you have them because it's easiier. You want the link to be straight whan at full throw . Here's a picture of my 40% sbach see how they are not straight at center , then straight at full throw.

Originally Posted by scott m lyons

Please take a side shot of the link when the surface is centered and at full throw. Looks to me like you need the link on the back side of the servo arm. Alot of guys set them up the way you have them because it's easiier. You want the link to be straight whan at full throw . Here's a picture of my 40% sbach see how they are not straight at center , then straight at full throw.

mine is straight at center, I thought that's the way should be until now !!
do you know the advantage with your setup? Thanks in advance.

Jack

Originally Posted by JackRC

mine is straight at center, I thought that's the way should be until now !!
do you know the advantage with your setup? Thanks in advance.

Jack

1;1 I have 1.5 arms and am 1.5 off the hindge line.

tried my full throttle rollers this tuesday at the field, i got it down to 2 ft. and about 100 ft. distance! followed by a rolling 1/4 loop to a pop top! lol dang these are fun! i heard some guy behind me sayin, "sheesh, this boy sure loves his rollers!" hahaha

Originally Posted by tomascratchbuild

tried my full throttle rollers this tuesday at the field, i got it down to 2 ft. and about 100 ft. distance! followed by a rolling 1/4 loop to a pop top! lol dang these are fun! i heard some guy behind me sayin, "sheesh, this boy sure loves his rollers!" hahaha

nice!! 2 ft.. guy behind you must tried to stay clam and looking around for cover, LOL

I was trying fast roll for couple minutes last week and was immediately told to fly further far away from crowd
and people start calling Crazy Jack since then, probably not in a good way

Originally Posted by JackRC

Here are the pictures of the servo arm on my 72" 3DHS Extra, look how tiny the servo is compare to the control surface...

I called my sponsor up and they sent me couple of new servos to test, new servo is Digital, Titanium gear called "Fi Tec" (ya, I know the name sucks but it's free). It suppose to deliver 257oz@6 volt, that translate to 100oz more than my current HiTec 7985MG.

Will give it a shot and also shorten the servo arm to see what's up.

Keep us posted on that Fi-Tec, the specs are impressive. Are you sure it's blowback that your getting?

Originally Posted by JackRC

nice!! 2 ft.. guy behind you must tried to stay clam and looking around for cover, LOL

I was trying fast roll for couple minutes last week and was immediately told to fly further far away from crowd
and people start calling Crazy Jack since then, probably not in a good way

lol me too, sometimes you get the guys who want to see more, then you get the guys who want you to land so they can maiden their warbird... and take their helmet off

Originally Posted by pryor808

Keep us posted on that Fi-Tec, the specs are impressive. Are you sure it's blowback that your getting?

I am pretty sure it is, because if I throttle down to 3/4 then it roll fast without any resistance.

alternatively, I've learned to start rolling at mid speed then gradually increase to full throttle, that way the aieron able to maintain at full travel.

still need to find a time to test the Fi Tec servo, since I am more concern about how reliable they are, I might leave it on the plane for a few months.

I know most of you say rudder & elevator but I just use elevator at high speed rollers ,if I use both I climb out even at low rates....

climb out would not be bad. i always end up pointed at terra firma. i think id rather climb out, you wanna trade?

I know one thing...If you want to increase your roll rate and you don't have hinge tape on the wings...then put them on!!!! I put hinge tape on my plane today and it increased the roll rate probably by 40-50%!