|Mar 22, 2011, 02:12 AM|
Harbor Models web page says coming soon.
|Mar 22, 2011, 08:15 AM|
I use Harbor Models as often as I can....service is extremely fast...I'm talking 48hrs from CA. to Bama. Good to know we have another source for the Nirvana.
|Mar 22, 2011, 08:25 AM|
On the subject of failsafes
My DX6 has that fail safe built in the radio. Where it comes in handy on the sailboat is...if you lose contact...the radio fail safes the throttle servo to a preset place. For example on my Nirvana that equates to power full up or sails wide open once contact is lost. Once contact is regained everything goes back to where is was or you have changed your controls to.
I've had this happen and the boat just sat out in the middle of the pond doing circles until she was rescued.
On my hydros, with the Tactic radio, the loss of contact allows me to program a preset power off to the motor. No loss of control...very important on a fast boat.
|Mar 23, 2011, 09:35 AM|
I was checking out the the availability of the boats/parts today and came across a bit of interesting info on the servo sail arms we've been discussing. It seem there ARE two versions to go with two versions of sail servos ....here are the links to look at them.
Notice each servo has different colored wires to tell which version you have. Apparantly the two different servos have different splines requiring different arms?
|Mar 23, 2011, 09:57 AM|
Thanks Crash. Err,,, how about brown, red, 'yellow' servo wires? Nice to know if I ever need to replace one.
|Mar 23, 2011, 12:02 PM|
|Mar 23, 2011, 12:41 PM|
Sail servo - survey
I would be interested in leaning what other sail servos are being used in Nirvana's. I read back through some of the post on this thread and found the three servos I have listed below. I posted the tech data I was able to find for each servo.
Interestingly, the Megatech servo has the best torque ratings. I have also read that the Megatech servo ratings are "suspect". I found no data to dispute it's ratings, only some reports of them not being able to pull in the sails in "strong" down wind conditons. (no hard data on how strong the winds were)
Anyone using other sail servos? Which ones?
How many of you have had problems with the factory servo?
How many of you have had problems with the replacement servos?
What were the problems?
Did you have to modify or adapt the servo arm to make it fit?
Please comment on your experience and offer any suggestions for other or better choices. Please don't limit your suggestions to only servos that comply with the race specifications.
WT:2.54 oz. 1.73×0.91×1.69 in (43.9×23.1×42.9 mm)
Torque:4.8V:122.0 oz-in (8.8 kg-cm)6.0V:153.0 oz-in (11.0 kg-cm)
Speed:4.8V: 0.70 sec/60° 6.0V: 0.56 sec/60
3-pole, Dual Bearing, Metal gear $50 estimated price
WT:1.95 oz (55.2 g) 1.59×0.77×1.48 in (40.4×19.6×37.6 mm)
Torque:4.8V:106.9 oz-in (7.7 kg-cm) 6.0V:133.3 oz-in (9.6 kg-cm)
Speed:4.8V:0.24 sec/60° 6.0V:0.20 sec/60°
3-pole, Dual Bearings, Metal gear $39 estimated price
Wt:1.97 oz (55.9 g) 1.60×0.70×1.50 in (40.6×17.8×38.1 mm)
Torque:4.8V:165.0 oz-in (11.9 kg-cm)
Speed:4.8V: 0.15 sec/60°
3-pole Bearings ? Metal gear $40 estimated price
* Resources used
|Mar 23, 2011, 05:23 PM|
Just got off the horn with Steve Lang, chatting about the torque spec's on the Megatech servo. He is convinced they are bogus.
He has had good performance with the high tech products and they fit without modifications to the boat or servo arm.
He did add that the sail servo arm has to be pressed on firmly to get in fully mounted on the Hi-tech 645MG gear, but it does fit. He also suggested putting some CA on the bushing that houses the springs so it won't turn.
Which was recenlty discussed in previous posts.
|Mar 23, 2011, 05:31 PM|
what to look for in a servo is a few things, is it waterproof ? total degrees of movement, torque, speed of movement..sail designed servos are usually designed for more rotational movement in arc, and higher torque ratings for case, or dimensional size...
sail servos are specifically designed for sail use. speed, arc, etc. mixing and matching wont give you the optimal performance for the application, thats why the servo manufactuers spend the $$ to make the specific servos for sail. in fact, the Seawind's directions, and premade radio tray are made only for the futaba 3801 servo, the boat's sail dynamics are engineered for that speed, and torque.
the only comment I can make on any of the chop suey servos is everyone knows the history of this junk. that servo aint got that much torque if it were hooked to the alternator in your car..
but, for the budget minded..lol, I guess it opens and closes the sails once in a while..
|Mar 23, 2011, 06:06 PM|
As we just spoke about the servos a few minutes ago, you brought up a good point about installing different servos, which is a fitment issue. the nirvana servo tray is cut for the chop suey servo. I had to enlarge the opening, and redrill the mounting holes to accomodate the bigger servo, this modifying stuff is so second nature to me, I just take it as no big deal, which is NOT good advice for others, you always help me with that stuff, my friend.. , thank you. here is a better pic of my radio box..along with the repositioned reciever and battery. reciever upside down for no water ingress.
And here is one of my Seawind, showing the switch/charge jack externally mounted.
|Mar 23, 2011, 10:20 PM|
Thanks for the new pictures. That big mama looks like it was born in there.
If you were closer, I'd be over at your shop, puttin your skills to work on my boats!
I am working on my new Nirvana as you know, and wanted to pick the minds of a few
of our brother forum members on this topic. What tool did you use to modify the servo space to fit the larger servo?
I have a pretty full set of Dremel accessories, and was thinking the small diameter diamond cutting blade woud do a
nice job. I have cut some pretty nice detailed items out of plex with it so, it should work fine for that task.
I may try the Hi-tech for starters, see how it works, and then if she doesn't handle the job, put in the Futaba. I do like the idea
of a simple drop in upgrade.
|Mar 24, 2011, 09:34 AM|
|Mar 24, 2011, 11:04 AM|
You did indeed mention the "questionalbe" specs for the Megatech FX220. I am hoping we hear from other Nirvana skippers on possible alternative sail servos they have experienced.
I am sure by reviewing the specs of other brands, I could find other possibilities. In that regard, I just got a new Hobby King catalog that lists the specs on many of their servos. Out of curiousity, I will scan their data to see there is potential match in their offering.
I am not a Hobby King fan, or supporter, but they do on occassion, have items worth considering. I purchased a Monsoon from them some years ago, that after I fixed it's rigging flaws, was a nice boat. The servos and sail winch lasted for the 2 years I had it, and are still functioning for the fellow that brought if from me. I don't know if those servos were the the same make as those they sell individually, but they performed quite well for me.
I have used Turigy ESC's for my FE's that work fine so, as I say, they have some things of value. They just stink at customer service. Point being, I am dubious about doing business with them. Moving on. Just like to find ways tospend less when possible.
I continue to learn from this forum, and appreciate those of you out there that continue providing my RC education. So, keep the infomation flowing.
I went way back to the last page of this thread to find a posting that you had done way back when you started this thread that has a bunch of possible alternative servos. Thought I 'd reprsise it hear - which kind of addresses my questions.
Model Torque 4.8/6.0 Size Weight HobbyPeople Servo City Tower Hobbies
HS-625MG 76.37oz/94.43oz 1.59"x0.77"x1.48" 1.94oz. $40 $36
HS-645MG 106.93oz/133.31oz 1.59"x0.77"x1.48" 1.94oz. $40 $36
HS-965MG 111.08oz/138.86oz 1.57"x0.78"x1.45" 2.18oz. $70 $73 $70
HS-985MG 144.42oz/172.20oz 1.57"x0.78"x1.45" 2.18oz. $70 $73 $70
HS-5625MG 109oz at 4.8vlt 1.57"x0.78"x1.45" 2.18oz. $55 $50
HS-5645MG 143oz/168oz 1.57"x0.78"x1.45" 2.18oz. $55 $50
HS-5985MG 144.42oz/172.20oz 1.57"x0.78"x1.45" $90 $90
HS-5955TG 249.96oz/333.29oz 1.57"x0.78"x1.45" 2.18oz. $115 $114 $110
HS-5998TG 199.97oz/249.96oz 1.57"x0.78"x1.45" 2.18oz. $115 $114 $115
Cirrus 704MG 181oz/195oz 1.6 x .78 x .61" 1.73 oz $30
Cirrus 750MG 127oz/149oz 1.6 x .78 x .61" 1.93 oz $25
Cirrus DS751MG 149oz at 4.8vlt 1.6 x .78 x .48" 1.93 oz $25
Cirrus 701 126oz/144oz 1.6 x .78 x .61" 1.58 $20
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