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Cox Engine of The Month
July-2024
robot797's
"ULTIMITE COX 010: it has a clutch, E starter, throttle, exhaust, aluminum tank, aluminum venturi, gearbox with forward and reverse, and now its on a custom drawn and printed stand"
PAST WINNERS
robot797's
"ULTIMITE COX 010: it has a clutch, E starter, throttle, exhaust, aluminum tank, aluminum venturi, gearbox with forward and reverse, and now its on a custom drawn and printed stand"
PAST WINNERS
My new to me additions
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My new to me additions
Picked up both of these from the evil bay. I think I got an ok deal. $23 total on the .15 And $35 total on the 25. Their both in great shape look to have little run time. Only thing that is burgered up is that who ever had them used pliers on the hub, bone heads . Now I need to build planes for both. I do more building than I do fying, anyone else fall into that category, maybe it's just me. Oh Well. Have a great day. Oh ya I have venturi's and nva coming for both.
oldguy- Gold Member
- Posts : 368
Join date : 2015-12-10
Age : 70
Location : Idaho
Re: My new to me additions
I have come across this many times and it bothers the heck out of me. I chuck them up in a drill press on a shaft and file them, sand them and polish them out. The driver on the Fp is still available and having the thrust washer behind it is important as well. Both still available. The LA series engine uses many parts from the FP. The crank, prop driver, backplate, needle assemblies, wrist pin are all still available. The wrist pin on the FP has nylon end pads, I would take a peek at this as they do wear out especially if used on a profile due to the bottom pad taking the weight. Currently these are out of stock. The FP comes apart very easily and the cylinder is indexed with a very tiny roll pin. The liner has a small notch in the rim so use caution when putting it back together. Also, the rod while it looks symmetrical, it has a slight haunch in it which keeps the rod centered under the piston. Make absolutely certain that you get it's orientation correct when putting it back together or else the rod will bind on the crank pin.
In addition, both engine pictured use a o-ring under the venturi stack. It's very important that these are intact. This sometimes require the use of 2 of them. They're very thin. A padded clamp to squeeze them down firmly with the venturi to install the spraybar could be in order as thumb pressure is not enough. If not, the case heats up and starts sucking air. I have used Ultra Copper and Ultra Blue around the perimeter in addition to the o-rings if problems still existed. This causes erratic runs and poor fuel draw due to the leak and becomes apparent when the case heats up. These two engines will last your flying career if treated properly.
In addition, both engine pictured use a o-ring under the venturi stack. It's very important that these are intact. This sometimes require the use of 2 of them. They're very thin. A padded clamp to squeeze them down firmly with the venturi to install the spraybar could be in order as thumb pressure is not enough. If not, the case heats up and starts sucking air. I have used Ultra Copper and Ultra Blue around the perimeter in addition to the o-rings if problems still existed. This causes erratic runs and poor fuel draw due to the leak and becomes apparent when the case heats up. These two engines will last your flying career if treated properly.
Ken Cook- Top Poster
- Posts : 5542
Join date : 2012-03-27
Location : pennsylvania
Re: My new to me additions
Ken Cook wrote:I have come across this many times and it bothers the heck out of me. I chuck them up in a drill press on a shaft and file them, sand them and polish them out. The driver on the Fp is still available and having the thrust washer behind it is important as well. Both still available. The LA series engine uses many parts from the FP. The crank, prop driver, backplate, needle assemblies, wrist pin are all still available. The wrist pin on the FP has nylon end pads, I would take a peek at this as they do wear out especially if used on a profile due to the bottom pad taking the weight. Currently these are out of stock. The FP comes apart very easily and the cylinder is indexed with a very tiny roll pin. The liner has a small notch in the rim so use caution when putting it back together. Also, the rod while it looks symmetrical, it has a slight haunch in it which keeps the rod centered under the piston. Make absolutely certain that you get it's orientation correct when putting it back together or else the rod will bind on the crank pin.
In addition, both engine pictured use a o-ring under the venturi stack. It's very important that these are intact. This sometimes require the use of 2 of them. They're very thin. A padded clamp to squeeze them down firmly with the venturi to install the spraybar could be in order as thumb pressure is not enough. If not, the case heats up and starts sucking air. I have used Ultra Copper and Ultra Blue around the perimeter in addition to the o-rings if problems still existed. This causes erratic runs and poor fuel draw due to the leak and becomes apparent when the case heats up. These two engines will last your flying career if treated properly.
Again thanks for the rundown on the engines, both engines came with the carbs and had the O-rings installed. I have no use for the carbs so will probably sell or give to someone that can use them.
oldguy- Gold Member
- Posts : 368
Join date : 2015-12-10
Age : 70
Location : Idaho
Re: My new to me additions
As they are slowly aging and parts are more and more sold out....I pester several sources for future repair parts for my stash of 20/25 FP and 25 LA ....
I have both the Iron lung and ABN versions and becaus they are so easy to tame I only have one plane right now with Fox 35...For pure nostalgia I like the RM and Fox...but for a mostly problem free day of hack flying..I really appreciate the user friendly OS engines
You got a good deal on both of them
I have both the Iron lung and ABN versions and becaus they are so easy to tame I only have one plane right now with Fox 35...For pure nostalgia I like the RM and Fox...but for a mostly problem free day of hack flying..I really appreciate the user friendly OS engines
You got a good deal on both of them
fredvon4- Top Poster
-
Posts : 4004
Join date : 2011-08-26
Age : 69
Location : Lampasas Texas
Re: My new to me additions
oldguy, Peter Chinn did a 1976 writeup the RC version of that OS Max .15,
Sceptre Flight Model Engine Tests, OS Max 15 RC
It was one of the most powerful .15 plain bearing cross scavenge sport engines of the day. I have an NOS RC version that I hope to put to use one day future.
Well, I saw, it was lonely and needed company , and so I clicked "bid", and won it for only $9.99 plus $7.19 shipping today, an AP .09 RC Hornet.
Although its sister the .15 (actually .14) is a touch more powerful and a touch lighter, I like its looks (yeah, I'm into fashion statements ), needle although RC would work good on a CL aircraft as it is out of the way of being knocked off during a nose over. This ABC Sanye based mild Schneurle engine does seem to be a decent sport engine.
Sceptre Flight Model Engine Tests, OS Max 15 RC
It was one of the most powerful .15 plain bearing cross scavenge sport engines of the day. I have an NOS RC version that I hope to put to use one day future.
Well, I saw, it was lonely and needed company , and so I clicked "bid", and won it for only $9.99 plus $7.19 shipping today, an AP .09 RC Hornet.
Although its sister the .15 (actually .14) is a touch more powerful and a touch lighter, I like its looks (yeah, I'm into fashion statements ), needle although RC would work good on a CL aircraft as it is out of the way of being knocked off during a nose over. This ABC Sanye based mild Schneurle engine does seem to be a decent sport engine.
GallopingGhostler- Top Poster
-
Posts : 5432
Join date : 2013-07-13
Age : 70
Location : Clovis NM or NFL KC Chiefs
Re: My new to me additions
fredvon4 wrote:As they are slowly aging and parts are more and more sold out....I pester several sources for future repair parts for my stash of 20/25 FP and 25 LA ....
I have both the Iron lung and ABN versions and becaus they are so easy to tame I only have one plane right now with Fox 35...For pure nostalgia I like the RM and Fox...but for a mostly problem free day of hack flying..I really appreciate the user friendly OS engines
You got a good deal on both of them
Thanks Fred, I have new R/M with a McCoy .35 installed on it, when I got this os .235 I thought about putting it on the R/M, but the footprint of the .25 is so different than the RH .35. The RH will stay put and I will have to buyild another plane for the .25 and the .15.
oldguy- Gold Member
- Posts : 368
Join date : 2015-12-10
Age : 70
Location : Idaho
Re: My new to me additions
GallopingGhostler wrote:oldguy, Peter Chinn did a 1976 writeup the RC version of that OS Max .15,
Sceptre Flight Model Engine Tests, OS Max 15 RC
It was one of the most powerful .15 plain bearing cross scavenge sport engines of the day. I have an NOS RC version that I hope to put to use one day future.
Well, I saw, it was lonely and needed company , and so I clicked "bid", and won it for only $9.99 plus $7.19 shipping today, an AP .09 RC Hornet.
Although its sister the .15 (actually .14) is a touch more powerful and a touch lighter, I like its looks (yeah, I'm into fashion statements ), needle although RC would work good on a CL aircraft as it is out of the way of being knocked off during a nose over. This ABC Sanye based mild Schneurle engine does seem to be a decent sport engine.
Hey thanks for posting the article. Nice .09. I've got a new AP .15 I still have to break in for new plane I built. A .15 size version of the California quicker.
oldguy- Gold Member
- Posts : 368
Join date : 2015-12-10
Age : 70
Location : Idaho
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