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Wot 4 xl so it's a OS 91 surpass or DLE 20 petrol......Thoughts and advice needed

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john melia 116/09/2014 08:33:20
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1770 forum posts
24 photos

Posted by Mark Hancock on 13/09/2014 19:46:15:

I can vouch for marks wot 4 , because I've seen it fly , very nice model which flies very well on that dle , now all we need mark is some secret practise so we can give lee a run for his money teeth 2

Here is a picture to show exhaust installation dsc_0022.jpg

Wilco Wingco22/08/2019 15:21:02
167 forum posts
3 photos

90 to 120 2 or 4 stroke?. I always thought that a 90 4 stroke is equal to a 60 2 stroke and a 120 4 stroke being equal to a 80 2 stroke. So why won't a 91 2 stroke fly the plane O.K?. Or am I being a bit simple??. smile p

Frank Skilbeck22/08/2019 16:47:56
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4500 forum posts
101 photos

I've just removed a DLA 32cc from a Seagull Maxilift and put in a Laser 150, the DLA 32 started and ran well, but was very noisy and destroyed two silencers (well more like exhaust gas deflectors) the standard one and a pitts style one.

If you go the petrol route don't forget to budget for a decent silencer especially if your site is noise sensitive.

Petrol is more economical that glow fuel, but don't forget to budget for the new fuel pump and make sure that you have a good fuel can otherwise your car will stink on regular pump petrol.

Paul Marsh22/08/2019 18:30:50
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3727 forum posts
1057 photos

I have one with a OS 110 alpha in mine. Petrol would be ok, but either will do. Agreed, a .91 would be boring. 120FS ok, as well as the 110, which is fine.

Martin McIntosh22/08/2019 19:21:35
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2956 forum posts
1086 photos

Don`t bother with petrol in my opinion. I have had more hassel/dead sticks with these than anything else. Stick a Laser 155 in it. Little noise, fit and forget, plenty of power.

Tim Flyer23/08/2019 17:49:35
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1080 forum posts
211 photos

Agree with Martin. On this sized model I think glow engines offer a far easier solution. My Wot4xl is powered by a 2stroke OS 120ax which is quiet and very powerful, so it’s a great tow plane. I used the add on Ripmax servo operated wing tow attachment. I also reinforced the wing joining for extra security with two additional wooden dowels in the wing as the standard two wing bolt and single front tab can lead to damage to the leading edge as the wing vibrates in its slot. I think a good four stroke 120-155 glow in this plane would be ideal . My two stroke OS 120ax is very strong and quiet but the alternative four stroke engines use less fuel and vibration is probably lower.

Rich too24/08/2019 12:09:37
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3053 forum posts
1070 photos
Posted by Tim Flyer on 23/08/2019 17:49:35:

Agree with Martin. On this sized model I think glow engines offer a far easier solution. My Wot4xl is powered by a 2stroke OS 120ax which is quiet and very powerful, so it’s a great tow plane. I used the add on Ripmax servo operated wing tow attachment. I also reinforced the wing joining for extra security with two additional wooden dowels in the wing as the standard two wing bolt and single front tab can lead to damage to the leading edge as the wing vibrates in its slot. I think a good four stroke 120-155 glow in this plane would be ideal . My two stroke OS 120ax is very strong and quiet but the alternative four stroke engines use less fuel and vibration is probably lower.

I agree, and I bet a nice Laser as Jon suggested would be great. But I bet your 120AX drinks fuel at a good rate?

OP, it comes down to what you fancy, purely personal preference. I have numerous petrol engines (models and garden equipment) and all have been totally reliable. But I also have a Laser, and other alternative motors, as I want to try them too...

alex nicol24/08/2019 13:05:04
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302 forum posts
15 photos

It really does come down to what you fancy.

A fs like an ASP 1.80, (same crankcase size as 1.20) sounds great, quieter than petrol, but will drink fuel ( I shoehorned one into a flair christen eagle and it gave me unlimited vertical)

Petrol such as Dle 20 or 30 will be great on power, will cause more vibration, be louder, but cheaper to run and use much less fuel

for me, if noise isn't a problem go petrol, if it is glow fs

alex

Tim Flyer24/08/2019 14:25:27
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1080 forum posts
211 photos

Yes my OS 120ax two stroke is definitely a glow guzzler! Especially on full throttle. Most of the time I fly the plane at half throttle so it isn’t too bad .  Another thing I added on this plane are “up flapperons”  as I find it wanting to carry on floating in light wind landings. The flaperons shorten landing and provide some braking plus are a fun feature to use. The tank on the Wot 4 still gives a good 15 min though. It has great idling and good flexibility but a four stroke is definitely preferable. It just that I had the engine for a number of years and it fits . The laser 155 in it or any of the big OS 4 /asp 4 strokes would be nicer plus less thirst. The four strokes also have smaller exhaust cans. The 120ax muffler is huge.

Edited By Tim Flyer on 24/08/2019 14:27:50

Edited By Tim Flyer on 24/08/2019 14:48:56

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