Gas radial engines
#577
Done a little more today. Black heat resistant paint on the ring. and startet on the scale part of the ekshaust. It will end on each side where the wastegate was on the fullsize. I wanted to take it out back in front of the tailwheel also, as the main ekshaust is on the fullsize. but so much pipe will add a lot of weight.
#579
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Join Date: Feb 2018
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Problems in the march of the Moki 250 cc
Hello friends of the forum, I am Ariel from Argentina and I am in contact to see if any of you have information about a cut in the march of the Moki 250 cc due to high temperatures or lack of ventilation in cylinders or ignition, what can I say is that the latter I have installed just behind one of the cylinders, removed about 8 inches back. On the side of the ventilation of the same, I think they are with enough air flow both input and output, the model is a Gee Bee r3 of 128 inches in span, I hope someone can tell me something about it, thank you very much, greetings to all.-
#581
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Ariel from Argentina
Hello friends of the forum, I am Ariel from Argentina and I am in contact to see if any of you have information about a cut in the march of the Moki 250 cc due to high temperatures or lack of ventilation in cylinders or ignition, what can I say is that the latter I have installed just behind one of the cylinders, removed about 8 inches back. On the side of the ventilation of the same, I think they are with enough air flow both input and output, the model is a Gee Bee r3 of 128 inches in span, I hope someone can tell me something about it, thank you very much, greetings to all.-
#582
Wanted to show off my 3D printed dummies on the baffles for the Saito FG33R3 in my Phoenix 180cm Corsair but I'm new here and the forum won't let me..... :-(
Hope to maiden this weekend. Breakin has been done last year and the build is now almost done, took my time on the ringexhaust, motormount and the retracts.
Hope to maiden this weekend. Breakin has been done last year and the build is now almost done, took my time on the ringexhaust, motormount and the retracts.
#583
Her is a video of maiden with p47 from cy-models. The variprop did not make enough power and the plane take off to early before it had enough speed. so I almost lost it.
Next test with a 24x10 2blade prop. And it was like another plane. flies great. but I have problem with the engine getting to hot. so I am making some baffeling now.
Next test with a 24x10 2blade prop. And it was like another plane. flies great. but I have problem with the engine getting to hot. so I am making some baffeling now.
#584
Looking good! Bit hairy on the first take-off, good save!
How did you break the engine in? Recommended very rich running for a few tanks?? My 33 did an hour very (VERY) rich running and after that a half hour or so somewhat leaner, al on the stand. Built it in the airframe since then and ran for the first time with the ringexhaust in the plane two weeks ago. Ran for half an hour or so and now I'm very carefully leaning everything out, still a bit on the rich side of things. Now all cilinders start to play along together nice (temps are starting to match). Running a smallish adviced prop 17x8 two blade. Would love to go 18 or 20 inch three blade, but got the advice to hold back on a big prop until a lot more running hours are on the engine....
Will post pictures / video when allowed.
Keep it in one piece!
How did you break the engine in? Recommended very rich running for a few tanks?? My 33 did an hour very (VERY) rich running and after that a half hour or so somewhat leaner, al on the stand. Built it in the airframe since then and ran for the first time with the ringexhaust in the plane two weeks ago. Ran for half an hour or so and now I'm very carefully leaning everything out, still a bit on the rich side of things. Now all cilinders start to play along together nice (temps are starting to match). Running a smallish adviced prop 17x8 two blade. Would love to go 18 or 20 inch three blade, but got the advice to hold back on a big prop until a lot more running hours are on the engine....
Will post pictures / video when allowed.
Keep it in one piece!
Last edited by Reennie; 06-15-2018 at 01:48 AM. Reason: Typo's
#586
Did you do some of the manifold mods? Or are you running stock? And if so; is the engine performing as to be expected?
Mine is running quite alright and I wish to keep it that way. :-) I've read all kinds of doom stories about underperforming Saito radials and / or running hot problems or breakdown problems with them.
Good luck with your P47!
Mine is running quite alright and I wish to keep it that way. :-) I've read all kinds of doom stories about underperforming Saito radials and / or running hot problems or breakdown problems with them.
Good luck with your P47!
#587
Running stock. only made ringexhaust myself. The trick to adjust the saito radials is to monitor the temp on the sylinder 1. and dont adjust it to lean on the higspeed needle. the manual said 2 turn on the fg84. I use 4.5turn and adjust the midrange with the lowspeed needle.
#588
Thanks for the advice! I'm already very careful with the mixture. Was obvious during first breakin that #1 is the leanest, with the very (very) rich mixture it is the only cilinder that gets luke warm. The others stayed almost completely cold. Now they are almost even.
With my 33cc engine the base setting in the manual is on the rich side. To get all cilinders to fire you have to lean the mixture. This is on the full throttle setting and mid range.
Will maiden this weekend (if all is well). Will try to get some video.
With my 33cc engine the base setting in the manual is on the rich side. To get all cilinders to fire you have to lean the mixture. This is on the full throttle setting and mid range.
Will maiden this weekend (if all is well). Will try to get some video.
#591
Maidenflight is on Youtube. Still not allowed to post links, but if you look for "Reennie" on Youtube it's the first video in the list when you're interested. Will post the video directly when allowed.
Everything went well. Bit windy today, so kept the risk down to just one flight.
Everything went well. Bit windy today, so kept the risk down to just one flight.
#594
The goal for today was to keep it in one piece again. Failed this time. Not enough power / speed, forced it up (stupid me), stall and lots of small pieces of wood in the grass. Hope the engine is not damaged (at first glance not). Plane has gotten off worse. Will get back...
#596
Engine tested on the stand yesterday. Everything fine and dandy. Messed around with the needle settings and the engine is picking up much better now. Received plywood for the plane and glassfiber and resin for the new to be fabricated cowl. Now see to get some time for the rebuild. Will get back.
#600
My Feedback: (3)
Question for you FG84 and FG90 owners: I have an 84 RE Mod and have flown a stock 84 engine as well. Both have a characteristic “miss” in flight. The RE Mod just recently starting doing this after what I’d consider it just being broke in.
I have not researched this yet I just wanted to post a question and see if anyone has a solution.
Currently the engine has had a valve adjustment and all new NGK CM6 plugs. The exhaust is “clean” and mush less sooty or black than just a couple tanks ago which is why I consider it to be over the break in hump. I have also noted a small loss in peak RPM compared to just a few tanks ago.
It was over reving a Xoar 24x14 at 7400rpm so I switched to a Beila 23x12x3 and 6880 rpm. When I noticed less rev’s I changed back to the Xoar last weekend. Lately the weather around here has been hot with low humidity and I have adjusted the carb on the day as needed. Temps have been under control.
So basically I’m just looking to see if this jives with others experiences and if there is an adjustment or other solution.
I have not researched this yet I just wanted to post a question and see if anyone has a solution.
Currently the engine has had a valve adjustment and all new NGK CM6 plugs. The exhaust is “clean” and mush less sooty or black than just a couple tanks ago which is why I consider it to be over the break in hump. I have also noted a small loss in peak RPM compared to just a few tanks ago.
It was over reving a Xoar 24x14 at 7400rpm so I switched to a Beila 23x12x3 and 6880 rpm. When I noticed less rev’s I changed back to the Xoar last weekend. Lately the weather around here has been hot with low humidity and I have adjusted the carb on the day as needed. Temps have been under control.
So basically I’m just looking to see if this jives with others experiences and if there is an adjustment or other solution.