OS 33GT Gasoline Engine for Pattern
07-14-2016, 05:30 PM
#576
Scott, I can't see how. The engine easily hauled the 21"x10 woodie hybrid turning just about 7k on avgas. It sounded happy. But I only ran it briefly then switched to the lower load.
A couple years ago i had also tried a 19x13 woodie hybrid with wider blades and the engine met its match there, bogging down to around 6500 and running hotter than normal. Too much load and definitely more than my 21x10 hybrid. Wasn't happy and you can tell. My 21x10 is a true narrow blade design.
I think Ken is right. When I installed the new set of clips I probably didn't seat them properly. I don't buy what Hobby Services said about the bearings being bad with shrapnel in them.
A couple years ago i had also tried a 19x13 woodie hybrid with wider blades and the engine met its match there, bogging down to around 6500 and running hotter than normal. Too much load and definitely more than my 21x10 hybrid. Wasn't happy and you can tell. My 21x10 is a true narrow blade design.
I think Ken is right. When I installed the new set of clips I probably didn't seat them properly. I don't buy what Hobby Services said about the bearings being bad with shrapnel in them.
I doubt the circlip theory. Even though I do insert these circlips the way Ken said, they wouldn't just come out if put in the other way 'round. Even with excessive force, the circlip wouldn't come out without there being visible damage to the circlip groove, unless it wasn't inserted into the groove properly, or the groove isn't deep enough which would be unlikely.
After I insert circlips, I always squeeze together slightly and turn it. If it's seated properly, it will turn easily. if not, then it won't turn.
Still a very strange failure though.
07-16-2016, 07:26 AM
#577
Gary, nothing new to report. I commissioned another 33 in my Delta and it's working the same outstanding way my first one did. Same carb and pipe settings as the first. It has about 6-7 gallons through it or about 100 runs. I used the 20.5x10 PN on this one.
Delta has been in the shop lately for a face lift so no recent flying.
Ron had a lot of issues with his 33's, enough so to move to the much less expensive EME line. The DA 35 also had some issues according to Ron.
if you don't have a plane for your engine yet, consider buying my nib Shinden.
Delta has been in the shop lately for a face lift so no recent flying.
Ron had a lot of issues with his 33's, enough so to move to the much less expensive EME line. The DA 35 also had some issues according to Ron.
if you don't have a plane for your engine yet, consider buying my nib Shinden.
Thanks, Gary
01-03-2017, 09:02 AM
#578
My Feedback: (90)
Does anyone have the link to the material used in the making of the tuned pipe coupler in this post? http://www.rcuniverse.com/forum/rc-p...l#post11229262
01-03-2017, 01:41 PM
#580
My Feedback: (27)
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This should link you to the copper rtv gasket maker
https://www.mcmaster.com/#catalog/122/3463/=15r71j0
u want the permatex 81878, can also pick this up in most auto parts stores.
This should be the material used. I used the 1".
https://www.mcmaster.com/#catalog/122/851/=15r724i
This is the teflon tape used to wrap your mold. I used a 1/2" alum wing tube. Also wrap around the outside to hold shape while setting up.
https://www.mcmaster.com/#catalog/122/3488/=15r72bu
Pair of gloves and wax paper for the table is advisable as it is pretty sloppy while doing. I'd recommend two wraps if using the 1" material. A single wrap blew out on me, but they work great.
https://www.mcmaster.com/#catalog/122/3463/=15r71j0
u want the permatex 81878, can also pick this up in most auto parts stores.
This should be the material used. I used the 1".
https://www.mcmaster.com/#catalog/122/851/=15r724i
This is the teflon tape used to wrap your mold. I used a 1/2" alum wing tube. Also wrap around the outside to hold shape while setting up.
https://www.mcmaster.com/#catalog/122/3488/=15r72bu
Pair of gloves and wax paper for the table is advisable as it is pretty sloppy while doing. I'd recommend two wraps if using the 1" material. A single wrap blew out on me, but they work great.
Last edited by rm; 01-03-2017 at 01:45 PM.
01-03-2017, 01:54 PM
#581
My Feedback: (90)
I guess I'm not following. I thought it was a fabric like material that was wrapped several layers, each one getting a pasted with rtv gasket maker.
rm it tubing is used what do you mean by two wraps? One tube install another?
Thanks guys for helping explain this.
rm it tubing is used what do you mean by two wraps? One tube install another?
Thanks guys for helping explain this.
11-08-2017, 06:08 AM
#589
My Feedback: (3)
Yes Ed, my buddy Sergio Zamora knew him personally and I talked to him a few times over the phone and bought some top quality stuff from him. Matt Kebabjian is missed in the R/C community. He was a true artesian type modeler. RCU please keep this thread open as an honor to his legacy and contribution to the community.
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flyintexan (04-28-2020)
04-28-2020, 09:22 AM
#591
Always wanted to use a engine but not YS as my budget is not that high... but I wonder how would a OS gas engine perform against the YS in terms of torque & why not many people are using a gas engine in a F3A plane? any idea please help..
04-28-2020, 11:35 AM
#593
Ryan Gonsoulin flew his OS33 at the Nats. Plenty of power. My Pentathlon with a DLE 35ra with a canister is not quite as powerful, but has the power to fly Masters. You just want to enter the uplines with some energy. Maybe with a pipe it would be the same performance as Ryans.
04-28-2020, 11:44 AM
#594
I don't think any 2 stroke gas engine will ever have the torque of a 4 stroke YS. The mid-range punch of the YS is awesome, especially the 185 and 200.
04-28-2020, 11:49 AM
#595
YS, especially the cdi versions, produce more mid range torque, so can swing bigger props at lower revs. They also provide better down line braking and much easier to get constant speed.
Overall, YS will out perform the OS.
04-29-2020, 09:48 PM
#597
I am building a F3A mono plane 2X2 meter but have to decide what engine to use... as there are less options available in engines.. & I do not prefer to use electric motor...
04-30-2020, 05:53 AM
#598
The OS 33gt is a long stroke and as such in my opinion has a slightly better torque band than the other gas engines of its size. Ryan spent some time tuning the mid range and it ran really well until a ring gave away. OS replaced the motor and he has since installed and flown but only a couple times due to work and winter/spring off season. I saw big G fly his with DLE and performance was excellent considering it was near 11lbs (I think) and setup on a canister..sound was fine too. The DLE with rear exhaust is definitely a cleaner/easier install and the header may indeed hold up better over time. Computermonkey, I would like to see more details of your soft mount.
-mark
-mark
04-30-2020, 08:23 AM
#599
My Feedback: (90)
https://www.rcgroups.com/forums/show...of-a-softmount
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flyintexan (05-01-2020)
04-30-2020, 09:19 AM
#600
Please see this link on what was done. I was able to directly replace the YS In the same space. Don't get me wrong I like YS engines my favorite being the 175 sport with cdi and the 115 sport cdi.
https://www.rcgroups.com/forums/show...of-a-softmount
https://www.rcgroups.com/forums/show...of-a-softmount