Been gathering data for sometime... posted all I could get good, objective data on.
Here's a link to my spreadsheet. (If anyone can provide more detailed, and accurate information, please send me via PM)

These weights represent "real world" RTF weights. Includes prop hubs/bolts/washers, ignitions (where applicable), mounts (where needed), and for comparison sake, a constant weight for an ignition battery and switch was used. Motors include carbs and plug, and ignition sensors that come with stock purchases.

If you find it helpful info, let everyone know - if you take issue with any info, let me know.

http://www.rcaerobats.net/GAS_ENGINE_WTS.htm

To the best of ability, I have authenticated stated weights, and for all but the Zenoah and DA, I have personally weighed these examples on my own digital scales (I use two to cross-check).

The DA50 looks a little low. It's exactly 48 ounces with the spark plug. Maybe 47 ounces without spark plug.

Great chart! Thanks.

It's good info.

But, your thread title is for 50cc engines. Why the 40cc engines and the G-62 in there?

Change the thread title to "Gas Engine Weights" and I'll be happy.

Thanks for putting that together. Its good info.

Feedback appreciated!

Have updated some reference info, primarily relating to the need for standoffs, and noting the Taurus includes a radial mount in it's base weight. For sake of clarity, I chose the Hangar 9 Alum mount for reference for all motors needing a "beam" mount.

Thanks to those who have PM'd feedback to improve the data integrity!

How about adding the 3W-50? Do you need the wts?

Yes. Please PM details, if you have them, what kind of scale, etc. Thanks.

3w50 -really nice engine - but weighs a bit more than a ZDZ60 - -- unless the engine has been revamped in last few years -
when we were doing th large Dalotels - a friend bought one rear induction - the power was excellent - not as good as the ZDZ60 but a smooth strong runner . The sales pitch to him was it would easily outpull the 60 --In my book equal with the ZDZ50NG powerwise but gives up a pound - the DA50 and ZDZ50 on my postal scales were exactly the same weight in same configuration .
here is a 3W50 at work in one of the Dalotels - this one done by Jeff Blaylock

Pretty nice list. I have been surprised at how many people don't know the real weights of gas engines with everything included. They are usually way low in their estimates. 4.5 pounds is a pretty good estimate for a lighter 50 cc gas engine with everything included.

Good job Bob, I'm sure that many of the modelers out there will appreciate the non-biase information,particularly the newbies to gas engines.
If there is anything we can help on please let us know.

WOW-- how about that. I suppose all of that ounce counting does not make that much difference when you figure in everything. Great job in putting all of that together. thanks Bob!
AJF

That was the thing that surprised me the most. After reading ALL the stuff in so many forums about the weight of this 'n that, and how "critical" it was.... as I have found to be the case most of the time --- EVIDENCE speaks truth --- and the evidence in this case says it just don't make much of a difference, basically.

Kinda makes one think that maybe an engine selection should be made on a variety of criterion, and NOT just the "weight", eh??

Excellent, excellent data, Bob. Thanks for taking the time. It is surprising how little difference there is among the "premium" brands.

Thanks, all! Hope it is helpful.

If anyone chooses to link to my page, please just let me know, as this is original authoring.... thanks!

Bob what do "they" say about truth in advertising, ha ha.your chart will now dispell some of that so-called truth he he he he .
Now all you have to do is get the honest HP numbers to go with the chart.
GOOD LUCK with that one.

HP figures? Yah, right...........

I can get SOMEWHAT close, as I use the BME 21 x 8 as a benchmark prop in the motors I've owned. All tached with my own tach, fully-warmed up, all motors within first gallon or so of use.... all using manufacturers' recommended oil and oil ratios.

Taurus T-52 - 7490
BME 50 - 7390
Fuji 50 EI - 6250

(the Fuji is gaining ground with more time, VERY affected by break-in. Same with Taurus; it is still tight)

Okay - to make it slightly more interesting, I have completed posting "street prices" now.... makes the data more interesting.
Prices used are either distributor/manufacturer's, or resellers, whichever was least posted price on Internet commerce pages. NO "special deal" pricing, none include shipping.

Enjoy!

http://www.rcaerobats.net/GAS_ENGINE_WTS.htm

(Don't shoot the messenger.... this is information ANYONE could have pulled together!!)

Just info, the FPE 3.2 (52cc) weighs 4.25lbs. with muffler, ignition, etc. No battery or switch included. This is the advertised weight, I didn't weigh it. But it seems in line with the rest of the 50cc engines.

Larry

Thanks, Larrry. Next time you have it off, and have time, you may want to get some actual weights and let me know. I'll be happy to include in the data.

Am I missing any motors except the 3W and FPE ? (The MVVS/Evolution is in there)

Aerobob,

I don't know if you want to include these or not, but Ralph just completed a conversion for me on a G62.

G-62 w/Rcign conversion including mount 67
Battery 4.9
Stock muffler 5

Total 76.9oz

Chuck

Aerobob,

What a tremendous addition to RCUniverse; thank you! I wish I had access to a similar database when I sat through multiple discussions about the "amazing" 50cc "featherweights"!! Your table is a great addition to the community - thank you!!

v/r

tom

Nope, sorry[]

The G-62 is NOT a 50cc engine. It's a 60cc engine, and should be compared to other 60cc engines. The ZDZ60 for example.

The G-62 has no business being compared to a 50cc engine. It's a more powerfull engine than any 50cc engine, and it's a little heavier.

If your gonna compare the G-62 to all the 50cc engines--then why not compare the Brison 4.2 (69cc) or the 3W70 too a ZDZ80? Or, why not compare the G-62 to the Brison 4.2 or the 3W70? They are almost the same thing, in a kinda-sorta pull it outta your butt kinda way.

There has to be a standard. If your going to compare 50cc engines--then do it.

If you want to compare 60cc engines--then keep it 60cc.

70cc engines? Then don't include any 60 or 80cc engines in the comparison.

If your just going to toss any old engine into the comparison chart--then it's meaningless.

But, not my thread, and not my chart. Just my opinion.

Rcpilet,

Point well taken. I was to caught up in thinking about other threads arguing about what is the best motor 50cc, plus remembering the fact a G62 weights 1oz less than a G45 according to Horizon Hobby's site. I thought it might add another choice for potential buyers.

Chuck

Rcpilet - You don't know how much information I have on 60 cc class motors. I posted "50 cc CLASS" (notice I edited the title of thread because of your whining) because it was what I wanted to do. Thank you for your observations.

Perhaps YOU have all the similar data on the 60's, and can save me the trouble??