By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by CML

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

All Topics | Latest Posts

Search for:  in Thread Title in  
Nigel Finch13/09/2014 13:30:38
77 forum posts
3 photos

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


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
8753 forum posts
489 photos

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
77 forum posts
3 photos

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.


cymaz13/09/2014 18:59:27
9334 forum posts
1211 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
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
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
11650 forum posts
1517 photos

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.


Lindsay Todd13/09/2014 19:38:13
1754 forum posts
1822 photos

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
56 forum posts
15 photos

Here is a picture to show exhaust installation dsc_0022.jpg

Nigel Finch13/09/2014 19:51:26
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
8753 forum posts
489 photos

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

Nigel Finch14/09/2014 16:40:27
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
11650 forum posts
1517 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


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

Jon - Laser Engines15/09/2014 08:41:04
5622 forum posts
271 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
554 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.


Chris C

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


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(!)


All Topics | Latest Posts

Please login to post a reply.

Latest Forum Posts
Support Our Partners
Sussex Model Centre
electricwingman 2017
Advertise With Us
Latest "For Sale" Ads
NEW POLL - has the pandemic altered your event safety perceptions?
Q: Has the covid pandemic deterred you from attending shows and events in 2021?

 No, I'll be attending just as many as I usually do
 No, but I'll choose my event with greater care
 Yes, I'll attend fewer events going forward
 Yes, I wont attend any where previously I have

Latest Reviews
Digital Back Issues

RCM&E Digital Back Issues

Contact us

Contact us

Magazine Locator

Want the latest issue of RCM&E? Use our magazine locator link to find your nearest stockist!

Find RCM&E!