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

[Nigel Finch]

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.

[..]

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 Cotsford]

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 Finch]

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 a]

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.

[cymaz]

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 Finch]

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 Hancock]

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 1 - Moderator]

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 Todd]

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 Hancock]

Here is a picture to show exhaust installation

[Nigel Finch]

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

[Max50]

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.

[..]

Have a chat with this guy **LINK**

[Bob Cotsford]

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

[Nigel Finch]

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 1 - Moderator]

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 H]

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

[Chris Channon]

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 Aardvark]

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

[john melia 1]

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

Here is a picture to show exhaust installation

[Wilco Wingco]

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??.

[Frank Skilbeck]

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 Marsh]

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 McIntosh]

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.