Log in
Search
Latest topics
» Cox C/L Helldiver w/parachute guy - disassembly, lots of partsby getback Today at 5:18 am
» Lathe machining Help needed please?
by aspeed Yesterday at 10:26 pm
» After 84 years, seven months and 15 days the Wen Mac P-38 is here
by andrew Yesterday at 5:07 pm
» My first Cox .049 engine.
by MauricioB Yesterday at 4:28 pm
» Cox Pinto question
by Levent Suberk Yesterday at 2:05 pm
» Keil Kraft Phantom Scratch build from start to flying.
by Levent Suberk Yesterday at 1:20 pm
» "DOCTOR DIESEL" Eric Clutton Passed Away
by sosam117 Yesterday at 1:17 pm
» 2-56 X 1 1/4" Unattainable?
by GallopingGhostler Yesterday at 10:24 am
» Carl Goldberg Skylane 42
by GallopingGhostler Fri May 20, 2022 10:24 am
» wanted - cardboard box or repops
by Kim Thu May 19, 2022 9:17 pm
» Big box arrives and pretty sad Prop Rod
by GallopingGhostler Thu May 19, 2022 9:13 pm
» Wanted P-40 landing gear plastic part
by latole Thu May 19, 2022 10:03 am
Silver QRC
Page 1 of 1
Silver QRC



I decided to overhaul a QRC I won ebay a few years ago….After rebuild I ran three tanks thru it rich….. It seemed happy at the rich setting at about 11K…. Fourth run leaned out to 13.5 K, About like the info online indicates…. Using a Cox 6-3 and Glow Plug Boy 24…. This was with a standard glow plug, The one that came on it, Also using three head gaskets as indicated by the instructions for break in I found online….Runs about three minutes…. Wished it would go a bit longer…. Maybe with a little more run time?
Not the strongest of Cox .049s but unique with its muffler which does a pretty good job….Just a little more trouble to prime….Nice to get oily hands agin, Never thought I would have missed that

rdw777- Gold Member
- Posts : 248
Join date : 2021-03-11
Location : West Texas
Re: Silver QRC


When I was looking for information on it online it was mostly to do with QRC’s with red tank and blue spinner but I ran into a post by rsv Bob, Looks like the plain ones were for rtf Cox airplanes, Belated thanks Bob!! Also an advertisement that hints at dating….
Also I want to thank Ken Cook for a past post that I saved on sealing tanks for Bee type engines, Those help tremendously to provide steady runs ….
Robert
rdw777- Gold Member
- Posts : 248
Join date : 2021-03-11
Location : West Texas
Re: Silver QRC
Robert,
What is the number on the cylinder? QRC should be #6 or not numbered , 2 bypass and no SPI. Also should have a 1702 head on it.
If it’s just a regular bee with a muffler on it then those tach readings sound correct. If it is a number 6 cylinder then put the TD head on it. I would also recommend a 5x3, but depends on your plans for it. What fuel? 1 gasket for every 10% nitro. So if 25 percent 3 gaskets 20% 2 gaskets etc. it’s a wag really, but you can add or subtract gaskets until you see the best performance.
Ron
What is the number on the cylinder? QRC should be #6 or not numbered , 2 bypass and no SPI. Also should have a 1702 head on it.
If it’s just a regular bee with a muffler on it then those tach readings sound correct. If it is a number 6 cylinder then put the TD head on it. I would also recommend a 5x3, but depends on your plans for it. What fuel? 1 gasket for every 10% nitro. So if 25 percent 3 gaskets 20% 2 gaskets etc. it’s a wag really, but you can add or subtract gaskets until you see the best performance.
Ron
Cribbs74- Moderator
Posts : 11841
Join date : 2011-10-24
Age : 48
Location : Tuttle, OK
Re: Silver QRC

It has a mark on it but I can’t tell much from it…. Yes, dual bypass and no SPI…. Also no taper or very little in the cylinder…. Also no 1702 head, Just standard….
If I do anything with it maybe a simple 2 channel RC…. I’m shopping on outerzone to see what might be interesting….. The muffler is appealing because there’s a chance I could fly about one mile from home…. Closest RC field is about 1-1/2 hrs away
rdw777- Gold Member
- Posts : 248
Join date : 2021-03-11
Location : West Texas
Re: Silver QRC
With standard head and 24% run one head gasket, should pick up some rpm. Not sure about run time. These engines require very little
break-in.
break-in.
crankbndr- Diamond Member
- Posts : 2866
Join date : 2011-12-10
Location : Homestead FL

» **VOTE-ON-THE-NEXT-COX-ENGINE-OF-THE-MONTH** (April 2017)
» Silver top piston?
» Silver Bee's keep following me home
» OS LA 25 - Silver CL
» Not bad, two for one plus a Silver Bee?
» Silver top piston?
» Silver Bee's keep following me home
» OS LA 25 - Silver CL
» Not bad, two for one plus a Silver Bee?
Page 1 of 1
Permissions in this forum:
You cannot reply to topics in this forum