Saito FA-62 RC Glow Engine Troubleshooting Part 7, felt clunk
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- Опубликовано: 4 окт 2024
- Trouble with my Saito FA-62. Been flying my Hangar 9 Piper J3 Cub for a few years now with a Saito FA-62 four stroke engine. Was running great for a long time. But recently it’s been stalling when the tank gets to be about halfway full, or halfway through a flight. Well, I did a lot of searching online and checking RC Plane Forums such as RC Universe and RC Groups for some advice and I got a few nice viewer comments with some tips (thanks!). The popular advice was that there must be a leak in the fuel line inside the tank that when the fuel drops to half tank, the line draws air which leans the mixture and stalls the engine. This made sense to me. So, I checked the fuel system and replaced all the fuel lines and installed new Dubro tank, but nothing stood out as a problem.
Then I decided to check the glow plug. Based on my evaluation, it appeared that the glow plug was not as powerful as it should be and was worn out. So I replaced it with a new OS Engines Type F glow plug.
Next I set the valve lash or the valve gap of the Saito FA-62B, also known as the tappet adjustment. I use a standard automotive feeler gauge to adjust between the valve stem and the rocker arm. I finish up by placing some Marvel Mystery Oil down the push rods and installing the rocker arm, or valve covers.
Next I did a test run on the Saito FA-62 using VP Powermaster fuel and a Master Airscrew 12-6 propeller. I showed how to adjust the high speed needle and the low speed glow fuel mixture settings for the carburetor and set the RPM for proper idle and up to full throttle.
Then I did some test flights. First, I just did a short flight to see how the new take setup worked, mainly I wanted to see about how long it would take to use up 1/2 of the glow fuel. This way I could gauge about how long I should be flying before I should start looking for that 1/2 tank stall I have been experiencing.
Then on my second flight I kept flying to see if the engine would stall when I got below half tank, and it did! So all the things I did to troubleshoot this problem (see playlist) did solve the issue. But they were still useful things to check.
So then I thought, maybe I'm just flying too slow and the fuel is simply not being pushed back in tank and sloshes forward when low and starves the engine? Well that seems to be the problem. On the third video I show faster flying and the engine ran the whole tank! And I tried this several times again and it appears that I just need to fly a little quicker and avoid slow sluggish flying, especially slow banking, to avoid cut outs. Interesting?
In this video I install a felt clunk in the tank. The felt clunk will soak up fuel and act like a temporary reservoir if the fuel in the tank sloshes and exposes the clunk to air. This will hopefully prevent the engine from stalling out.
I have been building, flying, crashing, modifying, and repairing radio control planes (RC Planes) for many years and enjoy sharing what I do with the radio control plane community, so I started RC Plane Tech channel for fun. I am not an expert, there are many different techniques to building radio control planes. A good way to learn about flying and building rc planes is to see what others are doing, that's what I do and that's why I like to share what I do. Thanks for watching my channel. Have fun!
Great video! 👍 I like how you mounted that 62 on the firewall - I have a Phoenix 1/5 scale and going to try installing my 62 on like yours! Hope you get it working well again!
Thanks, ya that was per the instructions. They have it at the angle which is nice because the muffler then exits right below the center of the fuselage.
As always a great video. Look forward to the flight testing. I too love the fiddling around of nitro engines.
Thanks!
Un ottimo video per fare esperienza e grazie a te che condividi, noi principianti possiamo migliorare per il futuro
Thank you Marco!
Looking forward to a positive out come. 👍
Thanks!
Hey James good to hear the felt clunk seems to have helped.it was good seeing you on camera as well. Take care.
Haha , thanks!
I hope this is a long term solution.
You mentioned setting the valve lash, I recently set the valves on my Saito FA 1.80. I decided to set them as tight as I could, .0015 feelers gage was dragging pretty tight on both. The engine ran and idled better than it ever had. After the engine was hot, I rechecked the gap, a .004 gage fit loosely. I was surprised how much the gap grew as it heated up.
I always enjoy your videos.
Thanks! Ya the valve gap is finicky. Im never really sure if I do it right. I don’t go too tight because I worry that if Im not at TDC then Ill mess up and they will be slightly open. So I stick with the instructions setting. Thanks as always for the tips and comments.
Although the velt-clunck is a good idea and works well, I could not help but notice that your 'in-tank' clunck-fuel-line is very very stiff. I had special thinwalled very flexible in-tank fuel-clunck line so the clunck could move to any corner. Even the forward corners. It was just the right size so it would not 'nick' but just bend... Never had any problems after I started using those. I do no fly fluel anymore but have done so for 30 years+. The correct stifness can be found...
Thanks for the insight, I appreciate it
Thanks for sharing your info. I have a OS FS-62v. Still not broken in. Will probably break it in on plane during ground test.
Thanks! Good luck with the new engine!
Stick about 3 feet of thin fuel line in the tank and prime all the air and bubbles out.
If you think you are having an issue sucking air from the tank you could always experiment with a header tank. Usually a small 2 oz tank placed between the carb and the main tank works fine. you can even strap it to the outside of the model to verify it works.
That’s interesting. I came across that in my search for solutions. I’ll have to look more into that. Something to consider if this felt clunk starts to gunk up.Thanks
Great video and well presented. I have 3 of these engines and they're among my favourite. Thanks for sharing.
Thanks!
I'm ordering a felt clunk today just as a preventative measure.. I'm rebuilding a fuel tank so, already have everything apart..
I appreciate the great content...
Hopefully the new clunk will keep my Ys 91 running well..
Nice, I hope it helps. It seems to have helped my setup a lot. Good luck with it. Thanks!
@@JamesRCPlaneTech
I couldn't find the exact one that you used from Redwing but, I'll see what comes in the mail.. I too ordered from Redwing.. This will be my first YS engine run.. I own several but, have quite the hord.. This one came on a Goldberg 300 that has never flown.. I've just about gotten it air worthy after many hours..
I bought it in June and I'm nearing completion..
I think the ones at redwing are generic, many on them look the same from different sellers.
And good luck with the build and engine!
nice!!
Thanks
Thanks for this. I came across this because i just got a hold of a Hangar 9 .40 sized piper cub. The manual calls for a Saito .50, which i was also able to find. The Cub i have seems to be version 1 because it does not look like yours. Although it may not be the same exact setup, it is similar enough that this video caught my attention. Keep us posted on your outcome.
Hi, thanks for the comment. Ya, I bet these ARFs are coming out of different factories. Good luck with it. I hope you have fun flying it. Between the Saito and Cub you will have some nice mellow flights.
I don't know if you like gas engines but I recently got a few of the SH GF6 and GF9cc gas engines that run of the glow plug like a glow engine and they are pretty good running engines and very economic not very messy! I really like them!
Yes, I want to start using gas engines. They look like a great option. I know they have been around for some time and are very popular. My next major build will probably be a 60 size scale plane, and Im planing on using gas. I did just get a great deal on a Saito 45 that I couldn’t pass up, so I grabbed it. But I am looking into gas for sure. Ill check out the ones you note above, I have some learning to do on them.
You need a larger tank also the height of tank, also seems like your silicone tubing in the tank is short distance to rear of tank and your losing flexibility of fuel tubing in tank, a standard clunk is all you need keep it simple, nice plane and engine good luck
Thanks for the tips. Ya it is a big clunk. And the two lines were on the stubby side like you said. I was happy that it worked. Unfortunately I dont have much leeway with the take size and position unless I do a major mod.
I personally use felt clunks in ALL my tanks.
Thanks for the comment. Ya, it really helps.
Thank you for this video!
Is that the hangar 9 .40 j3? I have one that I’m putting together as we speak. Do you mind sharing why you moutwd the engine at a diagonal as opposed to completely inverted with the cylinders coming out the bottom of the cowl? I have a Saito 11cc that I was planning to install inverted but after seeing this I’m wondering if I need to reconsider.
Thanks!
Hi, this is the Hangar 9, Piper with 80 in wing span for 40 class engines. The diagonal mount is how it’s designed on my plane. I think it was done to place the muffler directly below the cowl, there is a space in the underside of the fuselage to accommodate the muffler. I guess mounting it diagonally conceals the engine a little better. Hope that helps, its s great plane and ARF, good luck with it.
How about felt clunk and glow fuel with castor oil? Castor is oil that dries to a gum to hard film and might clog the felt.
Ya, know with the felts you have to check and replace. They get gummed and also deteriorate. Always pluses and minuses
Please let us know how it flew.
Will do, I have a vid on the way. Thanks!
Will these deteriorate over time though
I belive so, they need to be checked. That is one of the negatives to filters, apparently they will need to be replaced and tank cleaned etc.
Don't use shorts they are crap I for one will not watch them.