What size gas engine would be compared to a 180 4 stroke. Need to know if my 180 will be OK for my new build.

Please don't take my advice on it, but comparing a 1/4 scale DP Cub I am seeing running on 4-stroke OS 200 with pump and my 1/4 scale Balsa USA cub running a G23 , I would think that a G26 would be closer to whatyou may like.

What are you building Gene?

The Cobra-calls for a 50 gasser.

If it calls for a 50, a 180 4-stroke glow will MAYBE get it airbourne

Hey if I don't fly more than a couple of feet in the air, I might survive a crash

A 180 4 stroke would be way under powered for a 50 gasser.....a 50CC gasser is, math wise, roughly a 300 2 stroke glow

Probably would not get it out of ground affect, ya think. Looks like I am going to have to break into the piggy bank.

What he said!!!!

Ken
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I like to fly SLOW[b][/b][X(][X(][X(]

1.80 4-stoke =~ 30cc
1.20 4-stoke =~ 20cc (I have run both in the same plane and found the power to be the same (Saito 120, RCGF 20cc))
3.2 2-st gas =~ 50cc

Rough estimations I use, (10cc =~ .60ci).
Edwin

I'd revise that down a bit... though some gasser engines are more powerful for a given size than others.

1.80 4-stoke glow =~ 30cc gas
1.20 4-stoke glow =~ 26cc gas
.91-1.00 4 stroke =~ 20cc gas
35cc 2-st glow ( e.g. BGX-1 OS engine ) =~ 50cc

Sounds like I will have to buy a gasser. I don't want to end up with a land rover with wings

good revision..... the other list is outdated....todays reed inducted gas motors are pretty much on par with the same displacement glow engines....

my dle 20 puts out what my 120ax and saito 150 does and my 30cc vs 1.60fx

The DLE-20 pulls the same prop at the same RPM as a OS 120AX.

We had a Cobra at our annual IMAAFly-In a few years ago with, as Irecall, a twin 300 Saito. It was the next fastest thing to a jet! This is a model of a full-scale racing biplane. Not the best choice for a leisurely fun biplane.

The pilot did give it rave reviews as a nice handling model, however. He was knife-edging and stunting it beautifully.

The AX is a two stroker though and it should be pulling a smaller prop at higher RPM's than the DLE.

Out of curiosity, what RPM's did you clock using which props?

I wouldnt even want to know how much fuel a 300 glow engine would use......ok maybe I would but wouldnt want to pay for it

Any good deals on a 50 size, remember now, I'm po folks

The DLE range of motors are getting good reviews, and are really 'cost effective' options ..... I;m looking to stick a DLE20 into a H9 60 sized P51 (it actually fits with a wraparound pits muffler!)

I only have DLE-20's and 30's, no 120AX. But in the DLE-20 thread here on RCU, people were comparing the two and they run the same numbers within about 50 RPM's. Favoring the DLE. Im not going to split hairs over a 50 RPM, so I just said they run about the same numbers.

I have the DL50, precursor to DLE55. Been a good engine so far. A buddy has one with a lot of hours on it. He likes it.
Edwin

I just assembled a Great Planes Giant Big Stick, it calls for an OS 180 2 stroke, I installed a DLE 30, it seems to be about right. Based on that I'd say that an OS 120 2 stroke was about equivalent to a DLE 20 and an OS 180 2 stroke equivalent to a DLE 30. Hope this helps.

Gene, my 1.40 RCS is a 22cc but rear induction and high performance, no longer made or imported. My Brison 2.4 is a 40cc and gives about the same performance as the DA 50, also no longer made that I know of. The DLE 55 is a super buy. If you know any group of guys that get together and order from Hobby King and pay for the express shipping the price of the DLE is even cheaper from them. It's an outstanding engine for the price. Just toss the spark plugs that come with any of them and they are perfect out of the box.

are you sure about that, did you mean 3.2?.... my dad used to have a 2.4 and it would swing 18" props around mid 7s similar to what a DLE 30 can do