Eagler's Nest
Engines => 3 cylinder Radial => Topic started by: leshoman on June 13, 2018, 03:57:42 PM
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https://youtu.be/lgcQC8mDXow
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Hey, when did you change engines?
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https://youtu.be/FUaYi94siiQ
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Les, I bet you are starting to like that engine! For us, the slow rpm, compared to the half vw is strange to get used to.
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that 67” prop our front is going tontake some getting used to. it seems huge.
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For the bigger prop, did you have to shift the thrust line? Lengthen the landing gear?
RC
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centerline of engine raised 3”.
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Thanks. When you have accumulated some air time it would be great to hear about the flying characteristics compared to the 1/2 VW. I love that radial, low RPM sound!
RC
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to early for much defenative comments as of yet. still testing and getting things as i want them
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Update on progress so far:
Carb settings do not take much movement to make a difference. The LO side screw was easy to get set but still working on HI side screw. From what I can found out starting point is 2 turns out and it should not take more than 1/4 turn in or out from there. At 2 turns out the CHT is running about 300 and EGT at 800 at full power. At 1-7/8 turn out CHT is 350 and EGT is 900. The CHT seems to respond to changes more than the EGT. I have tried a total of 3 different locations for EGT and have moved both CHT and EGT to lower right cylinder, reads same as the top cylinder. I still have some tuning to do but it is doing good. In level flight without at same altitude at WOT i am seeing 2,400 RPM. Climb is consistently better than the 1/2 VW. When we get the starter and ring gear removed, once we figure out how to start the 3 cylinder radial by hand proping, we should be about 3 lbs. lighter than the 1/2 VW.
Vibration and sound at idle is good, there is a range between about 900 and 1300 the engine likes to shake. Above this range it again smooths out and does good. Flying behind the radial brings new vibrations and sounds i need to get used to. When the head set is removed in flight the engine sounds like it is just loafing along, more prop and wind noise than engine noise.
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Thanks! This is valuable information.
RC
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Holy heck, that sound is epic! This does not sound like a tiny airplane. Ha! This is so great!
Shoot, I'm torn on what I want to use. I just dunno if I can get past that obstructed view. Also that shaking... wow. Seems a bit much, no? Looks like this thing just wants to rattle right off the firewall.
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obstruction not an issue
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Update on progress to date:
Nearing 25 hours of total time on engine
I do not notice the engine restricting my forward view in any way, i would suppose if a person had never flow a tail dragger it may seem that way but after flying a biplane with limited visibility forward and down i have no problems with the engine blocking view.
Still working on carb and carb settings for best performance and considering changing to a mikuni carb from the Walbro. This would eliminate the fuel pump.
Engine vibration is not an issue at idle or power but there is a range in between that i go thru as quickly as possible.
Engine mount gusset's have been an issue and have resulted in more than one broken engine mount.
The 3 cylinder radial has lots of torque at low rpm and out climbs and will out run the 1/2VW of same horsepower.
Engine never sounds like it is running very fast and at cruise sounds more like an old tractor running then airplane engine. It is a few DBA quieter than the 1/2 VW at cruise rpm.
Total weight without the starter is approximately 4 pounds less than the 1/2VW total weight.
Finally figured out how to hand prop engine. The 1/2VW was easy to hand prop from behind prop and if it started at part throttle or even full throttle was not a problem in that plane moved forward into you and it was easy to just move throttle to idle. The 3V has to be propped from in front of the prop and at idle it is not bad, just hope i never have to do it at part throttle. I have a pair of large wheel chocks i use when propping.
Verner has been very good to work with and have been very helpful.
More to come as additional hours flown.
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Update on progress to date:
Nearing 25 hours of total time on engine
Still working on carb and carb settings for best performance and considering changing to a mikuni carb from the Walbro. This would eliminate the fuel pump.
Engine vibration is not an issue at idle or power but there is a range in between that i go thru as quickly as possible.
Engine mount gusset's have been an issue and have resulted in more than one broken engine mount.
The 3 cylinder radial has lots of torque at low rpm and out climbs and will out run the 1/2VW of same horsepower.
Engine never sounds like it is running very fast and at cruise sounds more like an old tractor running then airplane engine. It is a few DBA quieter than the 1/2 VW at cruise rpm.
Total weight without the starter is approximately 4 pounds less than the 1/2VW total weight.
More to come as additional hours flown.
I like the report Less, but have some questions on a few details.
Perhaps I was mistaken, I thought this was a proven set up overseas? if so, is there fuel different than hours, causing you to have tweak the carb or even consider changing it. I would have thought as a mfg of the engine, Verner would have EXACTLY the best set up. I understand it needs it. (your tweaking) But what are they (across the pond) doing that works that we (here) seem to need to do something different?
I guess the same would go for the mounts? wasn't that figured out where the engine was mfg? I am not saying this is not required as it certainly seems to be... But if it don't work one way, and does another way? it seems like the choice might in front of us. Perhaps this is an issue everywhere and your getting a good handle on it.
Keep up the good work!
Best of success!
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Regards the mount, the manufacturer has a mount on their 3VW but they do not offer mounts or mount ideas. By doing research every 3 cylinder engine i have found on line has a different mount some substantially so.
Regards the carb and settings, i have had a problem, not talked about, that has affected the carb issues. Finally have it corrected and now can get down to some meaningful carb adjustments.
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Any updates here? I love the idea of this engine and am strongly considering it on my build. Love following along with your testing and would be great if those using this engine determine the best mount and allow us newbies to copy the design.
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Les:
Does anyone run EFI on the 3V?...
Happy New Year, Steve
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Not that i am aware of. I am getting ready to try a Mikuni Carb.next couple of aeeks will have update on mounts
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Not that i am aware of. I am getting ready to try a Mikuni Carb.next couple of aeeks will have update on mounts
If you are going into the high country again I believe the Bing is altitude compensating - just say'n...