The flying monkeys got me...

Helis and fixed wing

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AMA Intro Pilot Instructor

Saturday, November 14, 2015

RCGF 10cc Update: Try, try again.

UPDATE: Its running fine!  Read the UPDATE.

At my last posting on the RCGF 10cc engine with an update, I was having the ups and downs of our hobby, trying to get a new engine to run. If it wasn't for the exceptional one-on-one service from Joe Nelson at RCFG-USA, I would have abandoned this long ago. After this, Joe and I are going to be drinking buddies! I haven't had such personal attention from a dealer, someone who is more disappointed about this than I am.

So... this morning I ran out to RC Buyers Warehouse in Nashua (if they don't have it, you don't need it), and picked up a Hanger 9 Power Pro HD Starter. I McGyvered an EC5 connection to the alligators on the starter and ran it off a pair of 3S 2650 mAh Lipos in series (~24V).  I used this to try to start the RCGF 10cc (more on that in a moment). I didn't mean to run it in series,but I fogot I didn't have a parallel cable and used the series thinking it was a parallel cable...  Since it worked well, I decided to unsolder the gators and installed an EC5. This evening I made up a series connector and tested it at ~12V 5300 mAh. Runs fine.







Now about the engine. I used the starter this morning, and I could not get the engine to start. I ran some experiments that showed that the vacuum was sufficient to feed the pump and fuel was coming out of it just fine. It was filling the pump outlet line to the carb; fuel was getting to the carb. Was wasn't it starting? Check spark, all fine. I decided to remove the engine and check the carb. I tried blowing in the inlet with the throttle open, and I couldn't. Don't know if I should be able to with the needle valve not being metered. I took it apart and removed the needle valve, used Gumout to clean it. With the needle valve removed I could blow through it fine. I put it all together and tried running it again, still no joy.

Joe Nelson (RCGF-USA) and I chatted and he got some calls with issues like mine, and spoke to some skilled pilots, and he realized that those of us having problems weren't using starters. As we thought, hand starting didn't develop enough vacuum. With the starter it clearly moved the fuel. The other guy who used a starter once he was told to had his start the first time, his problem solved. I have no doubt I needed the starter, but is there something wrong with this motor? Why? Joe got it running before he sent it back.  I am out of ideas.

Well Joe has a new engine coming to me with a return label for this one. He's going to see if he can get it running. I've uninstalled the engine and ignition, cleaned it and packed it to return, waiting for the new one.

I hope there isn't something wrong with me and my setup. We'll know if I can't get this one running.

I am optimistic the engine will be fine. I am not optimistic that I can get it running...


2 comments :

  1. Ken, try starting it with the tach unplugged. Read my comment on youtube.
    I also informed Joe of my issue.

    ReplyDelete
  2. Ken try starting it with the tach unplugged. See my comment on youtube. I also informed Joe of my issue.

    ReplyDelete