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What servo for Wots Wot XL

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Frank Skilbeck07/12/2017 14:04:05
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3974 forum posts
95 photos

Rocker a Sub C cell is just a different size to AA or AAA, eg. https://www.overlander.co.uk/premium-sport-3800-6v-flat.html, the big advantage is the lower internal resistance compared to high capacity AA cells, so on a large model where the servos will draw more power requires more amps, the sub C cells are better at delivering the amps without any significant voltage dip compared to AA cells.

The chemistry is identical to the AA Nimh cells but their larger size means a lower internal resistance.

Jon - Laser Engines07/12/2017 14:04:13
3679 forum posts
146 photos

I use subc nimh packs all the time. They get my vote, just make sure you also use the beefier heavy duty switches as well

Nigel R07/12/2017 14:31:28
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1167 forum posts
259 photos

Sub Cs are the big brothers of AA nicad/nimh cells. More capacity, can supply more current. Whether you need that capacity and current on this model? The model is certainly big enough to carry the extra battery weight without complaint.

john stones 107/12/2017 14:31:52
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9245 forum posts
1413 photos

And as your models bigger the weight penalty, don't matter so much, I use these switches, there are others available.

Engine Doctor07/12/2017 15:01:07
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1931 forum posts
19 photos
Posted by john stones 1 on 07/12/2017 14:31:52:

And as your models bigger the weight penalty, don't matter so much, I use these switches, there are others available.

Be careful with these switches and check thoroughly before plugging in a Rx. I plugged an expensive Rx in knowing that it was working a few minutes earlier and it was dead . Stripped the switch down and found power wire pinched with signal wire and insulation had failed . This fed power into the signal wire blowing Rx ! Not much room inside due to charge socket etc .It was only one out of four that I bought but cost me dearly. The dealer offered to replace the switch  ,but blown Rx fell on deaf ears !

Rocker07/12/2017 15:56:19
196 forum posts

Thanks ,now it has been explained it not a problem .I have order the sub C battery pack from Wheelspin Models and the heavy duty switch. I really should take Jon advice and order the Laser 180 while he has one Just want to make sure everything is fine before I splash out £825.So I think I will get 5 Futaba 3010 servo,1 subC battery pack ,1 heavy duty switch 1 laser 180 and a Futaba 3008 receiver and every think is good to go Unless there are any more hidden surprises ?Thank again for everyone help .

ASH.07/12/2017 16:22:10
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184 forum posts

Rocker, subC battery is bigger and heavier than your standard 6.volt AA. It will have to be a normal Nimh not like the low self-disharge eneloop, so it will need to be charged before flying. That's the main disadvantage. A 3000mah would be sufficient I think.
The alternative is a 3000mah Life, much lighter but it has the disadvantage in that you cannot check voltage remaining at the field using a battery load detector. It has be guessed and worked out by mAh put back in on charger. So you know roughly how many mAh each flight uses.
My decision would rest on engine weight and balance of model preferring to go with the Life without any added weight.
Jon - Laser Engines07/12/2017 16:30:40
3679 forum posts
146 photos

I use 3010 servos in some of my warbirds. They will be plenty, 3000 ish mah subc pack should give you at least 20 flights worth of capacity (check with your battery charger) and will have plenty of current capability. I personally use the futaba HD switches and have found them reliable.

i think you have all the bases covered

ASH.07/12/2017 16:31:13
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184 forum posts

Rocker, you don't need a S3010 for throttle. A 148 or 3001 will do fine.

Good idea to think ahead and get the engine now and all the bit and pieces in so when you're ready nothing is going to hamper you.
Denis Watkins07/12/2017 16:32:25
2668 forum posts
136 photos

I'm no aerobat Ash, so may not be typical

But to add to your figures, I have never put in more than 300mah during a days flying

I do a check after the third flight, and decide whether to top up

Obviously some models carry only 4 servos, and my delta has 7 servos

The big boys should therefore check frequently, assisted by external charge plug.

Even with a 3000mah pack, it would be safe to go airborne at 1000mah

Yet non of us would launch with a pack 2/3rds down

ASH.07/12/2017 16:47:26
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184 forum posts

One last tip Rocker, get Solarfilm clearcoat resin and seal all edges of film and trim before assembly. It will stay put for duration of the model
It's time consuming but well worth it.
I also use it for fuel proofer on firewall, tank bay and anywhere where else a drop of fuel might splash. Basically any exposed timber.
Good luck.
Ron Gray07/12/2017 17:54:59
810 forum posts
203 photos

I use a 3000mah LiFe pack on my WWXL and quite happily get a full day’s flying of 7 - 8 flights each of about 8 minutes. I usually take a spare pack with me, just in case, but to date have not had to swap. My flying style could be classed as ‘energetic’ sports, in other words quite a bit of throwing the ‘plane around. The pack is also used to energise the plugs when starting via the 2 x glow drivers.

Rocker12/12/2017 20:43:53
196 forum posts

Due to my own fault it looks like I have missed the boat with the Laser 180 ,(Jon did warn me) I have never use a petrol engine before but it looks like now is the time to rectified that ,fitting the petrol engine does not look that difficult so it looks like I might have to purchase an OS GT 33 petrol engine for the Wots Wot XL.I think this is the engine the Wots Wot XL was designed to have so fitting it should be strait forward and I am hoping it fit in the Wots Wot XL OK Anyone flown a Wots Wot XL with the OS GT 33 and could give me any information I might need fitting and flying the Wots Wot XL with the OS GT 33 petrol engine.Also what are the advantages (if any ) and disadvantages of a petrol engine over a glow engine???

Denis Watkins12/12/2017 21:06:48
2668 forum posts
136 photos

Same size glow is more powerful than petrol, but glow fuel £20 gallon, petrol £6 gallon

Glow quieter, petrol has ignition so should be more reliable

Petrol stinks, in boot, on clothes, on hands

Petrol chosen for economy and reliability in larger sizes

Jon - Laser Engines13/12/2017 00:25:29
3679 forum posts
146 photos

Denis has it mostly covered but laser fuel is only £16

Reliability is a hot potato as petrol engines have more points of failure so are statistically less reliable.

The stink can be removed with Aspen fuel but that is £20 a gallon (worth every penny).

My 180 petrol matches the glow for performance :D

Anyway I will have more 180 glows soon I hope. I have a large batch of engines and I am working to get them done for early next week. I hope I can get them done in time.

Ron Gray13/12/2017 13:23:02
810 forum posts
203 photos

Oooo, Christmas presents to self - I hope!

Rocker13/12/2017 15:41:43
196 forum posts

I,m first in line

Gary Vinten 113/12/2017 16:20:57
507 forum posts
323 photos
1 articles

I would use JX6221MG DIGITAL Servos from alliexpress or bangood at the moment they are selling 4 x for £25 including post and packing and £1.25 for insurance

They are rated at 20kg plus and centre very well and work on 4and 6 volts I use them in a 232 cap 50cc electric and they are fine wink

Jon - Laser Engines13/12/2017 16:51:37
3679 forum posts
146 photos

@ Ron and Rocker. Im just going to build one and put it in the ring with both of you guys. Fight to the death to claim the prize

Ron Gray13/12/2017 17:19:48
810 forum posts
203 photos

Rocker's said the naughty word and gone down the Odd Sod route so by default he's out. On the other hand I've torn myself away from the 'dark side' so I'm a good boy and as we all know that old saying, 'every good boy deserves lasers'

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