+1 again. Even some 120-125FS (Saito and OS) would not compare to a dle20 in terms of speed. Tested in a .60 size warbird.

to get DLE20 performance from a 1.20 FS you will need to run about 20-25% Nitro. Thats going to leave you at a financial disadvantage pretty quickly

Here is a nice Webra engine you don't see every day. Webra was way a head of everyone else in small gas engines. This one has a steel rod needle bearing on both ends. P5-90i

I think there will be a huge market for the 60cc twin. I know some have said this would never happen because it would compete with the 55cc, but I never saw how that would b the case. 2 different applications.
I think the market would be huge for a 15cc and some smaller twins. Ones that work. I had a JBA as well. It never ran right.

Kudos to DLE. I hope to see all of this come to fruition.

I agree Webra was way ahead....I have a Webra Bully 35cc engine. You could buy it in stock form as Gas ignition or a Glow version. I have a brand new in box...its going to get a Rcexl ignition placed on it. Capt,n

I did the same thing with one of my 35cc Bully's. Runs very good.

gas 20cc way better than any 91 FS - period! if your 91 FS is more powerful than your 20cc gas, you really have a problem

captinjohn what carburetor are you going to use? I'm using a Walbro WT540.

Not really sure how a .91 compares to 20cc anyway. A 20cc is a 1.2 ci. this is a dead horse of an arguement. The DLE 20 is a wonderful engine, and this thread is about new offerings. Comparisons have little place in this thread, especially when the displacements do not match.

Better ? a little closer 1.5ci

I may try the one on it, but it may have too large of a main jet. I have a couple new carbs that I may try also. I have had some good luck at redoing carbs too. How do you like the WT540? If it works perfect....I may buy one. Thanks Capt,n

With regard to DLE power compaired to glow I have direct comparision. Started with VQ 63" WS Hurricane. Had .91FS in it that was running bad. Couldn't figure out why. Plane had heavy hub and lead to get correct cg. The 91 with lead and a 120 OS FS weighted the same. Had a 120 on the shelf, so no use hauling around lead when you can have more cubic inches. Any way, the 120 turned a 3 Blade Graupner 15-8 prop 8,400 rpm. The plane had more than enough power.

In my converting the fleet to gas I decided to see if I could get a DLE 20 into the Hurricane. Finally did. Didnt want to mess up cowling so installed a straight pipe. Turned the same prop 9,100 rpm but was too LOUD. Put on stock muffler and butchered the cowl. With stock muffler turns the same prop 8,800 rpm.

The DLE has a little more power than the 120 and a WHOLE LOT more power than the .91FS

how much smaller can they get and still be reliable i wonder. remember that the smaller they get the closer all the components inside the case are going to get. the downside here is on the high voltage side the spark will look for the easiest path to jump across? which may no longer be the spak plug gap. we also seem to want them to be HV capable, again the higher the input voltage gets the quicker it will look for a way out? no doubt improvements can only be made through testing and the need for something new, so if something is being done great. I still dont see a problem with the igntions the way they are though. but i also dont fly warbirds with no room

Yep.
The dle 20 is. A loud engine
Irritating to listen to as well. With stole muffler.

For this reason, I placed a 1.25 saito
In my reactor bipe. Instead of my dle20.
And there. Is very little oil on my plane when I am done. Flying.
I didn't have to hack up the cowl and the sound from a 4 stroke engine is so much nicer than a 2 banger
gas engine w/ a tiny exhaust.

Thanks for sharing the Picts of the Webra.
Wish saito would have placed bearings in the crank/rod attatchment

I think the small 15cc gas engines built to be more like a glow engine, offer to be a drop in replacement for the .60 size engines.
They use a front rotary valve and carb too.

The regular utlility style engines still use horrid lawn mower mufflers and have carbs on the side or rear and tend to use big spark plugs tilted at a angle too. Plus they tend to use spacers and a radial mount kind of arrangement. That makes it difficult to put them into quite a few airplanes, plus you usually wind up butchering the cowl a lot too.

One example as such is the NGH 17cc gas engine for example. It isn't a big problem that it doesn't have needle bearings on the rod. But one needs to be careful with the oil to fuel ratio though. The exhaust outlet and screw spacing look like it matches some other engines too. One improvement to save weight might be to go with a one piece cylinder and not use the steel insert sleeve on it too.

I think there is a way to get smaller engines made with needle bearings on the rod, Fox did it way back in the 1960's with his .60 and .74 engines then. But later he discontinued the practice though. But nowadays there may be something preventing it. But if I remember correctly there is someone making custom Supertigre .91's converted to gas and they put in a new crank and piston with a steel needle bearing rod too. But I forget who it is at the moment.





Anyway I mounted a NGH 9cc gas engine onto the front of a .40 size Big Stick plane and I used a MAC's Sportsman's muffler on it too. The engine has a common muffler screw spacing to use any of the mufflers that would fit a OS 46FX, OS 55 AX engine and so on.

Ohlsson & Rice and Forrester used to make .23 and .29 CI spark ignition engines back in the '40's and they seem to've run fine.............

The smallest spark ignition gasoline engines were the little .12 engines. One of the O&R designers developed it too. But O&R made quite a few .19 and .23 gas spark ignition engines though.
There have been some homemade special engines that are down to the .020 size cylinders. Multi-cylinder ones too, and they use special extra tiny spark plugs.

O&R .12 engine

so evo just came out with a 10cc  need a dle 10 plz <div>
</div>

We still need that DLE 15

I think we need a small ignition.

The EVO ignition is smaller, Horizon even has a plane designed for it , the Hangar 9 Meridian.

http://www.hangar-9.com/Products/Def...ProdID=HAN5015

The Hangar 9 Meridian kinda looks like the Great Planes Dirty Bird http://www.rcuniverse.com/magazine/a...rticle_id=1454

PLEASE, please, PLEASE let anything new be a rear exhaust!

+1

If you made everything perfect what would be left....fun?