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What servo for Wots Wot XL

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Rocker06/12/2017 21:03:19
211 forum posts

Need to buy some servos to use in a Wots Wot XL I am planning to power it with a Laser 180 ( If Laser have any 180 not sure what is going on with stock of the  Laser engines ,will give Jon a ring after the Christmas break to see what is happening ) I will be using my Futaba 10 J transmitter .I usually use the Futaba 148's but not sure if the 148 will be good enough to power the Wots Wot XL ,be great if they would be OK I have loads of spare 148 I do not really want to spend a fortune on servos but I need to know the servo I fit will be up to the job.So what servo would people recommend for the Wots Wot XL????or would the 148 be OK would save me a fortune if they where OK

Edited By Rocker on 06/12/2017 21:06:08

cymaz06/12/2017 21:05:50
7633 forum posts
981 photos

Hitec hs625mg are superb....others may have differing opinions

Rocker06/12/2017 21:08:50
211 forum posts

Just noticed Laser have 5 180 in stock so that has answered that question

john stones 106/12/2017 21:18:03
9555 forum posts
1428 photos
Posted by cymaz on 06/12/2017 21:05:50:

Hitec hs625mg are superb....others may have differing opinions


Martin Harris06/12/2017 21:38:01
7625 forum posts
189 photos

I'm sure that many of us are seduced by the need for blingy servos. Reference to a calculator such as this suggests that a humble 148 has plenty of power to spare in moving a 10" x 2" control surface 40 degrees at 80 mph even on 4.8V 

There are certainly times where a model benefits from the faster movements and holding power of digital servos but unless you're into 3D aerobatics, those lowly 148s will probably do just fine - and are extremely reliable to boot. The only real problem with 148s is that they are prone to wear on the output bushing after a lot of hard use so 3001s (same servos with ball races) might be better if you have some - or just keep an eye out for wear.  Do try to maximise the travel from the output arm - no compensating for lazy installation practice by turning down the ATVs by a significant amount!

I don't know what size the control surfaces are on the Wot but try running them through the calculator to get an idea of their suitability. The rudder is the surface most likely to need a stronger servo BTW...

Edited By Martin Harris on 06/12/2017 21:48:46

Ron Gray06/12/2017 22:30:07
884 forum posts
231 photos

@Rocker - second the vote for the 625s! Re the engine, the 180 is a long stroke so would probably be difficult to fit in the WWXL, certainly Jon advise me against it so I went for the 160v and do not regret it one bit. Tim has a 155 in his and gets excellent performance from that too, plus Laser have some of those in stock at the moment.

Jon - Laser Engines06/12/2017 23:17:40
3820 forum posts
149 photos

The WWXL should not need anything more than 5kg on each surface. the 625's more than cover that off.

Also having seen one of these models in the flesh the 180 would be ok but will hang out a little more than the 155. It shouldn't be ridiculous though and the power will be there.

As a side note, one of the 180's I tested today was very excitable and chopped clean through my inch diameter sawn off broom handle starting stick. Glad it wasn't my finger.

Stuart Z07/12/2017 07:11:44
289 forum posts


Steve Webb does converters to change the 148’s into ball-race


Tim Harris 107/12/2017 09:05:58
721 forum posts
103 photos

@ Rocker...Agreed re servos . The important thing is to make sure there is no “stiction” on the ailerons as each aileron servo will be running two ailerons and if the hinges are sticking that will burn out servos 😳. If you plan to tail mount servos you will use two tail servos so power doesn’t need to be that much 4-5 kg is plenty. I do think it’s worth getting a decent reliable make though as it’s still a big plane . On your engine choice I think the 180 would also be nice. It will stick out of the cowling but on the plus side it will save you having to add nose weight if you are using tail mounted servos. The 155 power is fine but the 180 might be even better with its big prop capability. I would like to try it too

Nigel R07/12/2017 09:35:26
1282 forum posts
284 photos

I'd be tempted to double up the 148s on the elevator, one per elevator half, just for the redundancy.

You might need something a bit more beefy than a 148 on the rudder for something this size.

I'm sure someone else (who's actually got one) can confirm or deny all of the above.

Jon - Laser Engines07/12/2017 10:34:34
3820 forum posts
149 photos

Rocker if you need that 180 can you let me know asap. I listed 20 engines on the site last night and have only 7 left this morning with only 2 180's remaining.

I doubt i will have much left by the end of the day

Rocker07/12/2017 10:58:27
211 forum posts

Jon thanks for letting me know about the 180 but I will give you a ring after Christmas ,bit busy at the moment .I am in no hurry was looking more after Christmas to buy the engine 

Edited By Rocker on 07/12/2017 11:01:54

Jon - Laser Engines07/12/2017 11:19:51
3820 forum posts
149 photos
Posted by Rocker on 07/12/2017 10:58:27:

Jon thanks for letting me know about the 180 but I will give you a ring after Christmas ,bit busy at the moment .I am in no hurry was looking more after Christmas to buy the engine

Edited By Rocker on 07/12/2017 11:01:54

Thats fine but we are closing down in January to move our factory so it could be into February or March before i can make more. Its all a bit up in the air as i dont know exactly how its all going to play out.

I dont want you to hold fire now and fine you cant get one when you need it

Edited By Jon Harper - Laser Engines on 07/12/2017 11:20:31

Bob Cotsford07/12/2017 11:25:01
7267 forum posts
415 photos

I used various Savox servos, TowerPoo MG996Rs and the Hextronic (HXT12K) equivalents in the AW/WWXL that I had, mainly because I'm cheap and they were to hand face 1. They all did the job. 148s would be struggling in my opinion but anything 5kg or more should do the trick.

Rocker07/12/2017 11:34:53
211 forum posts

Thanks again Jon .That will be fine I do not fly much in the winter and I am a slow builder so February /March will be OK I will buy the Wots Wot and servos ( sounds like the HiTec 625 are the ones to go for) after the Christmas break and I will give you a ring after Christmas and order a 180 and it all should be ready by the spring perfect .Thanks everyone for your help

ASH.07/12/2017 12:11:04
207 forum posts

For all flight surfaces I would use 4x Futaba S3010. They have the guaranteed required torque and Futaba reliability. You will need a decent subC cell or Life battery to power them.
It's a beautiful model.. one I'd be proud to own.
Richard Wills 207/12/2017 12:20:56
123 forum posts
7 photos

My brothers WWXL has Savox 0352 everywhere except the rudder which has an MG996R on it, does the job nicely.

Jon - Laser Engines07/12/2017 12:44:55
3820 forum posts
149 photos
Posted by Rocker on 07/12/2017 11:34:53:

after the Christmas break and I will give you a ring after Christmas and order a 180

Ok no worries. Please note that i cant take your order if i dont show stock on the website. Its all part of my plan to drag Laser out of the 80's and keep the engines in stock. If i keep taking back orders forever nothing is going to change here so i have to be pretty hard nosed.

It sucks as i want to sell stuff but long term its the only way.


Sorry to drag us off topic. 

Edited By Jon Harper - Laser Engines on 07/12/2017 12:45:15

Rocker07/12/2017 13:29:10
211 forum posts

ASH that has thrown a spanner in the works. I never gave the receiver battery a thought This will be my first big model so I have only used 6 volt nimh receiver batteries.I take it that the normal 6 volt nimh receiver battery will not be up to the job then.So I am a bit confused now with the receiver battery .Do not even know what a sub C battery is and I have never used a life receiver battery before and there was I thinking this would be easy So what exactly do I need for the receiver battery,sorry if I am coming across a bit dumb but I am new anything bigger than a Laser 80 will fly

john stones 107/12/2017 13:59:12
9555 forum posts
1428 photos

Just variations on a theme Rocker sub C's are the big uns here

Life, easy to use and popular assuming you've a charger that do them.

Let someone else give you the Chemistry lesson. wink

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