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Engine weights, accessory weights, parts weight, etc, can be hard to establish because the published weights by manufacturers at times do not specify what is included, and at times are just not plain accurate. Particularly for engines, some of the add ons can be significant, such as water coolant, radiator, items that are necessary for that particular engine, i.e. header tank, two batteries, and even some items that may not be included in weight listed such as gear reduction, alternator, etc.
I think most of us feel we can trust a building buddy, so it would be great if anyone that has an opportunity to weigh an engine, an accessory, anything that goes on a plane, there would be a lot of pilots and builders that would be grateful if you could post it. This can be very helpful for someone that is trying to play with CG during their build, and also after one is flying.
I'll try to keep an eye out for posting on other threads and post the comment, and also keep in mind to post items that may be critical for the weight saver crowd, so someone can look at a list of options. If someone wants me to remove their comment, let me know.
Below is a listing of weights as builders respond. I'll note whether it's derived from factory claims or actual weighing, and refer to the builders post.
Engine weight source includes weight determined by
Jabiru 3300 181 lbs John Austin's post start, alt, exhst, carb, oil cooler factory claims
Cont O200 198 lbs Steven Ward without oil, exhaust, or plug wires photograph of scale
Corvair (IFB) 229 lbs Larry Bird 2700 Azalea exhaust was off and doesn't include the
airframe mounted cooler/filter
I agree that total installed weight is the true "engine weight." As you point out, the bottom line is you have to include everything that is relative to having a functional engine that actually runs once installed in the aircraft! So you're correct, even a header tank's weight would need to be included if a fuel injection engine requires one!
The Jabiru 3300 specifies its weight as a "ramp weight" (which I would assume means total installed weight) at 178 lbs. and specifies this weight includes the starter, alternator, exhaust, carburetor and ignition system. The only additional equipment I installed was an oil cooler (2.8 lbs), oil sump cooling duct (?few ounces?), and a catch bottle for the crankcase vent (?few ounces?). So, I would estimate the total installed weight at 181+ lbs.
John Austin on avionics weight…...
My Nav/Com is 5 lbs and eventually will be switched out with an MGL but that spot will then get a transponder in it so not much will change there but I'm sure I can get the nose lighter with those changes.
You can save significant useful load with the right combination of equipment. The MGL V6 com only weighs about 250 grams and has a stereo intercom! My XTreme EFIS is very light and lets me control a remotely-mounted Sandia 165R transponder that only weighs 1.18 lbs.
Steve Tschurwald on brake line weight…..
Lyndon Leining on Cruzer part weights...
John I can help with two of your big piece weights.
Rudder 5.1 pounds, fin 7.5 total (12.6 pounds.)
Full stabilizer fully assembled except for vinyl tips. 21.2 pounds, includes complete with counterweights etc. vinyl tips weigh .7 pounds. ( 21.9 pounds total) + the rivet weight to rivet vinyl tips on.
Hope this helps a bit.
Mark Maltais on Sky-Tec starter weight…...
Reply by Mark Maltais
My new Sky-Tec starter came in yesterday. I weighted it and it came out at 9.4 lbs!!! When I pop the old one off I'll check that one to get a comparison but I'm sure it's in the 16 lbs arena with Norm at the least. The old starter is pretty massive compared to the sky-tec's...
John Austin on 750 slats weight…...
"I weighed the epoxy primed and catalyzed urethane painted slats before installing them and they weighed 7 lbs each."
Joe Harrington on tire weights...
Comment by Joe Harrington on July 5, 2011 at 10:24pm
Thomas Spickermann on the 750 Steel Bungee weight
The whole system weighed in at 1.6 kg (3.5 lbs). I forgot to weigh the bungee that I removed, though.
…Added by Thomas Spickermann at 3:39pm on November 30, 2014