Hoochykins Posted September 25 Share Posted September 25 My usual go to servo is the JX PS-1171MG but I'm looking to stick a couple in the wings of a Riser 100 for the spoilers so wanted to keep the weight down and the 1171-MG's are on the heavier side at 17.5g, could you guys recommend a lighter but reliable servo that isn't more expensive than it needs to be? Quote Link to comment Share on other sites More sharing options...
Shaun Walsh Posted September 25 Share Posted September 25 These are a little smaller and lighter, I have used quite a few of them. https://www.4-max.co.uk/servo-emax-ES08MAII.html Smallest I have use was this one in a RES glider spoiler. https://alshobbies.co.uk/ripmax-sd150-micro-servo-9g-0-16s-1-5kg-p-sd150-p-sd150?search=ripmax servo Quote Link to comment Share on other sites More sharing options...
Hoochykins Posted September 25 Author Share Posted September 25 5 hours ago, Shaun Walsh said: These are a little smaller and lighter, I have used quite a few of them. https://www.4-max.co.uk/servo-emax-ES08MAII.html Smallest I have use was this one in a RES glider spoiler. https://alshobbies.co.uk/ripmax-sd150-micro-servo-9g-0-16s-1-5kg-p-sd150-p-sd150?search=ripmax servo Non metal geared would save a bit more weight wouldn't they? Or am I going to see naff all difference trying to cut down the weight in the wings by a few grams? Quote Link to comment Share on other sites More sharing options...
PatMc Posted September 25 Share Posted September 25 The weight of a 100" span model isn't all that critical, especialy if you mainly intend flying from the slope. In fact it's likely there will be more occasions when a bit of extra weight would be benificial to penetrate against the prevailing wind or fly through sinking air quickly. IMO 12 oz/sq ft is a good all round target wing loading & 8oz is min to be able to fly that type of glider regularly in UK. Making provision for adding ballast when required would be more useful than saving a few grams. Quote Link to comment Share on other sites More sharing options...
Hoochykins Posted September 25 Author Share Posted September 25 Understood, my concern was adding weight outside the fuse along the wings making it less responsive Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted September 25 Share Posted September 25 15 minutes ago, Hoochykins said: Understood, my concern was adding weight outside the fuse along the wings making it less responsive Fit your servo of choice Hooch and don't overthink it. 2 Quote Link to comment Share on other sites More sharing options...
Hoochykins Posted September 25 Author Share Posted September 25 Well it sounds like it won't make a whole lot of difference which I thought was the case anyway but thought I'd stick it out there. I think I will get a couple of EMAX ones as they do save a bit of weight and don't cost any more than the ones I normally buy. It's one of those things, I have a lot of old gliders that are fixed up but when you build one yourself you want to make sure it's absolutely perfect 😊 Quote Link to comment Share on other sites More sharing options...
Nigel R Posted September 26 Share Posted September 26 remember the engineering mantra hoochy, "close enough's good enough" the trick is working out what 'close enough' is 😄 Quote Link to comment Share on other sites More sharing options...
Engine Doctor Posted September 26 Share Posted September 26 17 hours ago, Shaun Walsh said: These are a little smaller and lighter, I have used quite a few of them. https://www.4-max.co.uk/servo-emax-ES08MAII.html Smallest I have use was this one in a RES glider spoiler. https://alshobbies.co.uk/ripmax-sd150-micro-servo-9g-0-16s-1-5kg-p-sd150-p-sd150?search=ripmax servo Plus one for the 4max mg servos but as JS says dont over think it. Quote Link to comment Share on other sites More sharing options...
Cuban8 Posted September 26 Share Posted September 26 A little extra servo weight is really not going to be an issue in this application, providing the servo is a good fit and is easy to install. Buy from a reputable seller such as 4-Max or ServoShop and you won't go wrong. A metal geared servo is not really needed with simple small 'letterbox' airbrakes/spoilers, but will be fine if you find a suitable one size wise. Fewer very small analogues available these days I notice, but still around if you look. Quote Link to comment Share on other sites More sharing options...
Hoochykins Posted September 26 Author Share Posted September 26 I'm going to order up a few EMAX servos for this one, at least then I will have two 'go to' servos. When it comes to analogue or digital from what I've seen it's just the response time is better on digital, what is everyone else's views on these? Am I missing any negatives or is it just as simple as quicker response? Quote Link to comment Share on other sites More sharing options...
Cuban8 Posted September 26 Share Posted September 26 (edited) Emax servos are fine in my experience - used them in a couple of small autogyros. Some good basic info here.....https://www.radiocontrolinfo.com/the-difference-between-analog-and-digital-rc-servos/#google_vignette Without overthinking things for the average sport flyer (me), digital servos are just an improvement and development on the ages old analogue devices that themselves were developed from more basic pre-integrated circuit technology. They have a better performance (lost on most models that just cruise around etc) and as such will need a good solid power supply e.g a quality 4 or 5 cell Nimh pack of suitable size from one of the reputable suppliers, or for other small-ish models not using a battery with up to four/five servos, a BEC with a minimum current capability of 3A should give plenty of headroom. No one size fits all, naturally, and some will have other preferences, but the above I believe is a reasonable ball-park description. TBH, fit your servos - whether digital or analogue, test thoroughly on the bench and then range test as usual (fail safe on the airbrakes) and then go and fly the model. Good luck and enjoy the model. Edited September 26 by Cuban8 Quote Link to comment Share on other sites More sharing options...
Hoochykins Posted September 26 Author Share Posted September 26 Brilliant, thanks guys. In the end I took at a look at 3DXR and sorted by only EMAX and JX, removed the wrong sized ones, factored in weight vs power and ended up with the PS-1109MG which saves about 7/8g on each servo and are just as cheap as my normal PS-1171MG. I needed to do an order for more servos anyway so as I like the JX servos I think these will be perfect and save a slight bit of weight. If I can't source JX in the future I know I will be just fine with EMAX. Much appreciated guys as always 👍 Quote Link to comment Share on other sites More sharing options...
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