Ron Gray Posted April 2, 2022 Author Share Posted April 2, 2022 Yup! Quote Link to comment Share on other sites More sharing options...
GrumpyGnome Posted April 3, 2022 Share Posted April 3, 2022 18 hours ago, Martin Harris - Moderator said: Another giveaway was the way the revs dropped off when Ron removed the starboard glow plug - a large drop in RPM is an immediate indication that the idle mixture may be too rich. Stored that nugget in my head........ best write it down as my memory gets worse each........ day! Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted April 3, 2022 Author Share Posted April 3, 2022 Cowl port carb cutout revisited Plumbing (sorry about the colour clash, couldn't be bothered to change filament spools!) Quote Link to comment Share on other sites More sharing options...
Nick Somerville Posted April 3, 2022 Share Posted April 3, 2022 Nifty work again with the 3d printing there Ron. Have you tried 3d printing servo mounts for going into wings? Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted April 3, 2022 Author Share Posted April 3, 2022 Second garden run, engine leaned out, @GrumpyGnome listen when I remove the glows, revs don’t drop like they did yesterday. This, imo, proves that on-board glows can cover up poor engine tuning. 1 Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted April 3, 2022 Author Share Posted April 3, 2022 11 minutes ago, Nick Somerville said: Have you tried 3d printing servo mounts for going into wings Yes Nick, most of my plan builds have 3D printed servo mounts. 1 Quote Link to comment Share on other sites More sharing options...
GrumpyGnome Posted April 4, 2022 Share Posted April 4, 2022 13 hours ago, Ron Gray said: Second garden run, engine leaned out, @GrumpyGnome listen when I remove the glows, revs don’t drop like they did yesterday. This, imo, proves that on-board glows can cover up poor engine tuning. Nice! I see what you mean re removing glow plug. I am practically salivating....... How does the 3d printed filament stand up to the exhaust heat? Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted April 4, 2022 Author Share Posted April 4, 2022 Where it’s positioned and being connected with silicon there is very little heat transfer so the PETG bracket isn’t really affected. I’m using similar ones on other models which have also got their baffles made from 3D prints and there doesn’t appear to be any problems. Quote Link to comment Share on other sites More sharing options...
Zflyer Posted April 4, 2022 Share Posted April 4, 2022 Thingiverse show a number of servo mounts for 3D printing. I have some in use at the m9ment all good. Same as electric motor mounts on my foam models. Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted April 4, 2022 Author Share Posted April 4, 2022 (edited) I tend to design my own: And for where transparent film is going to be used for the covering Edited April 4, 2022 by Ron Gray 2 Quote Link to comment Share on other sites More sharing options...
GrumpyGnome Posted April 4, 2022 Share Posted April 4, 2022 9 hours ago, Ron Gray said: Where it’s positioned and being connected with silicon there is very little heat transfer so the PETG bracket isn’t really affected. I’m using similar ones on other models which have also got their baffles made from 3D prints and there doesn’t appear to be any problems. Good to know - ta. Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted April 7, 2022 Author Share Posted April 7, 2022 All ready for flight testing tomorrow! 3 Quote Link to comment Share on other sites More sharing options...
Kevin Fairgrieve Posted April 7, 2022 Share Posted April 7, 2022 2 hours ago, Ron Gray said: All ready for flight testing tomorrow! We need video evidence or it never happened.? Quote Link to comment Share on other sites More sharing options...
Nick Somerville Posted April 7, 2022 Share Posted April 7, 2022 Wow! Looks the business tucked up in that cowl with the perfectly positioned needles. Happy flying tomorrow. Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted April 7, 2022 Author Share Posted April 7, 2022 3 hours ago, Kevin Fairgrieve said: We need video evidence or it never happened GoPro batteries already charged will also try and get Ian to film some on the Sony too. 1 Quote Link to comment Share on other sites More sharing options...
Peter Jenkins Posted April 7, 2022 Share Posted April 7, 2022 Looking forward to seeing it in the flesh (balsa?) tomorrow Ron! Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted April 8, 2022 Author Share Posted April 8, 2022 Well an eventful day's flying! The first flight was carried out but the engine just wasn't fully on song, especially when I was climbing which I put down to it running too lean. So after this flight I removed the cowl and re-tuned the needles. The next flight was somewhat short and not recorded as it took off and the engine immediately cut resulting in a forced landing in some rough grass - no damage. I ran the engine up again and noticed that as soon as it ran for more than 10 seconds at full throttle the engine started to falter and when I looked more closely I could see quite a lot of air in the fuel tubes. Further investigation led me to make a new (bodged) connection between the fuel supply tube and the filler valve as that was where was air was being drawn in. The next flight was a lot better but still needed some more tuning (as I had fiddled with the needles before finding the air problem). I had a few more flights with it today and will attach another video of the last flight of the day when I nearly ran out of fuel! 1 Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted April 8, 2022 Author Share Posted April 8, 2022 Last flight of the day. The wind had really got up by now but I still had some fun and nearly ran out of fuel which forced a hasty landing. Completely uncut vid! 11 Quote Link to comment Share on other sites More sharing options...
Paul De Tourtoulon Posted April 9, 2022 Share Posted April 9, 2022 Nice flight, I was also glad to see that you didn't 'vet' the landing,, were you really flying over those buildings in the distance ?. Quote Link to comment Share on other sites More sharing options...
Kevin Fairgrieve Posted April 9, 2022 Share Posted April 9, 2022 Nice one @Ron Gray, I look forward to hearing that music soon. Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted April 9, 2022 Author Share Posted April 9, 2022 1 hour ago, Paul De Tourtoulon said: were you really flying over those buildings in the distance Simple answer is No! I think the building you’re referring to is the wood chip factory on the edge of the airfield (the one producing the smoke). Our flight patterns take us no closer than 50m to that complex. There are also a couple of full size hangars at the end of the full size runway which we don’t go near (VLOS would be difficult that far out!). At this time of year and at harvest time our main ‘problems’ are farm vehicles when we occasionally have to take avoidance actions! 1 Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted April 9, 2022 Author Share Posted April 9, 2022 1 hour ago, Paul De Tourtoulon said: you didn't 'vet' the landing No point really as these are ‘warts and all videos capturing my experience of the first runs with this new engine which is why the first vid is there with the engine not at its best. It’s a shame that I didn’t get a video of the engine cutting on the next take off showing the somewhat bumpy landing because I would have shown that too! Quote Link to comment Share on other sites More sharing options...
Chris Walby Posted April 9, 2022 Share Posted April 9, 2022 Hi, Ron nice vids and what tank are you using/flight times please. Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted April 9, 2022 Author Share Posted April 9, 2022 15oz tank will give me approx 8 minutes. I may well change to a larger one. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.