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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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Nigel Finch13/09/2014 13:30:38
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Hi all,

a very experienced pilot I totally trust the opinion off said my under construction Wot 4 XL that has a OS 91 four stroke about to be fitted would be better off with a DLE20 petrol engine.

happy to do this but a quick read shows

DLE20 easy to start, cheap to run, self tuning so less need to have hands near prop, reliable

against

heavy, lots more plumbing, radio interference ( have twin Spectrum DSMX receiver ) ,

do not want the plane to scream round the sky but reliable, fun to fly as I progress with plane but not prop hanging performance

any thoughts as no experience of four stroke or petrol engines.

..13/09/2014 14:55:58
974 forum posts
1 photos

Hi Nigel, Im not sure about the self tuning ? Petrol's need running in & to be tuned as well and a well tuned Four Stroke wont need to be touched.

I think the 91 will be a bit limp for the XL, I have 3 and they are good but not enough for an airframe as big as the XL. A 120 would be more the tool.

There's a good thread here **LINK** Paul is a very experienced flyer and his went very well on a 25cc Petrol.

Edited By Justin K on 13/09/2014 14:57:11

Bob Cotsford13/09/2014 15:37:27
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7972 forum posts
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I ran an ASP120 4st in mine and was a bit disappointed with it. A 91 might fly it, but would you really want to? Never mind the DLE20, why not a 30? I only run one petrol but interference is not a problem, nor is there any extra plumbing.

I did think about buying another one at the LMA Much Marcle show but for a 180 4st.

Nigel Finch13/09/2014 15:48:52
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77 forum posts
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Thanks for comments so far

any info on petrol engine experience would be good, starting, install etc. as I said this is not for fast screaming around the sky flying just a good fly in possible windy conditions over winter and having fun

please keep em coming

Mark a13/09/2014 16:31:57
321 forum posts
3 photos

I have a ASP120fs in mine and its brill a 91 would be ok but you may get bored with its lack of performance plus you can't beat the sound of a four stroke.

Mark.

cymaz13/09/2014 18:59:27
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8652 forum posts
1175 photos

A club member has a petrol in his wot xl. He's delighted with it. Though work was needed to get it under our noise restrictions.

Nigel Finch13/09/2014 19:08:42
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77 forum posts
3 photos

Well just Unboxed the Wot to start building. On a lot, and I mean lot of sites it clearly states .90 to 120 two or four stroke. Know two more powerful but hey jo who am I to question.

On the box it's 120 four stroke or 90 to 120 two stroke so a large number of stores have the wrong info.

well now have to purchase a new engine so it's four stroke or petrol. My OS 91 is not suitable Grrrrr

Mark Hancock13/09/2014 19:10:53
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56 forum posts
15 photos

Have a DLE 20 in mine and it flyes well. The standard exhaust was a bit loud so fitted a header pipe and canister and it flyes very well.

john stones 113/09/2014 19:28:38
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10586 forum posts
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DLE sounds good to me Nigel, cheap to run and reliable, no interference as long as you keep ignition away from your electrics, very good on fuel as well. I agree standard exhaust is a bit noisy though.

John

Lindsay Todd13/09/2014 19:38:13
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1698 forum posts
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Have a couple of DLE20's as above a bit noisy on standard exhaust but very reliable, good fuel economy and bags of power - very impressed.

Mark Hancock13/09/2014 19:46:15
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56 forum posts
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Here is a picture to show exhaust installation dsc_0022.jpg

Nigel Finch13/09/2014 19:51:26
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77 forum posts
3 photos

Thanks Mark, that's a exhaust and a half !

Max5013/09/2014 21:38:54
178 forum posts
8 photos

I've been unlucky with my petrol engine. First one I've had. An NGH GT25.I've had the exhaust stub fallen off twice, due to vibration ( fixed with a longer 4mm threaded stud ). two broken plugs due to mounting the engine inverted, ( I've now mounted it as a sidewinder ), and also took the undercarriage off due to either bad fuel or loose clunk.

So the XL is in the hangar, undercarriage repaired , and just needing the throttle cable repositioning, with a 120fs waiting in the wings, just in-case I get tired of messing about with the GT25.

They are noisy though. Have only flown it briefly 4 times due my problems. It did fly OK when it was in the air.

Wished I fitted the 120fs first time. May have been less hassle. There's a petrol newbie for you.laugh

..14/09/2014 07:24:57
974 forum posts
1 photos

Have a chat with this guy **LINK**

Bob Cotsford14/09/2014 10:31:39
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7972 forum posts
439 photos

Same mountings as a 120 but will swing a bigger prop - sounds ideal to me.

Nigel Finch14/09/2014 16:40:27
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77 forum posts
3 photos

Just seen HobbyKing do a extra muffler kit with a few good reviews. Anyone used this on the DLE20 as it could bea solution. Our field may have noise restriction soon.

looked at OS gt22 and that seems a quite option but £ 100 more but ignition system shielded. This is a one off purchase to last years but any feelings on the difference guys.

Thoughts ?

john stones 114/09/2014 18:54:42
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10586 forum posts
1480 photos

Don't worry about interference from your petrol engine Nigel, follow the instructions in the manual you'll be o.k.

If you are worried about noise I reckon a canister is the best solution. The DLE is a good engine.

Spend the £100 on silencer

John

Edited By john stones 1 on 14/09/2014 18:55:08

Jon - Laser Engines15/09/2014 08:41:04
4793 forum posts
179 photos

I used a Laser 150 and Laser 155 on mine. Went like a scalded cat in both instances!

Chris Channon15/09/2014 10:51:53
539 forum posts

Hi Nigel, i would go for the 120 four stroke.

I do have a 180 four stroke just run in if you would like to borrow that to try.

Regards

Chris C

Alistair Aardvark16/09/2014 07:15:52
16 forum posts

Nigel,

I recommend a Saito 125 - they are light, powerful, and ultra reliable once set up. Look out for a used one on BMFA classifieds, a used one avoids the lengthy running in which is about their only disadvantage.

I had one in my Christen Eagle which you've seen flying before I wrecked it(!)

Dave

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