stunthanger.com
General control line discussion => Open Forum => Topic started by: Paul Taylor on October 09, 2007, 07:20:48 PM
-
So my good buddy Willie handed me a vent for my LA .46.
I got home and put it on the engine, fits nice. So I see that the remote needle can be mounted either way on the mount. So I figure I will try it on the side to see if it will help save the life of the NVA in the event of a inverted landing.
I figure I would post this in case someone else might have not had this brain fart.
I know the remote needle is not the best, but for those figure of us still doing figure 9's it may be just the ticket.
So what say ye?
-
One more view...
Of course this is for a profile mounted engine.
-
So far in all the years of playing with these engines I have yet to find the perfect spot to protect a needle valve in an uncontrolled landing. Have fun, DOC Holliday
-
I agree Doc, but at least this way the needle might be saved and just bend the bracket. HB~>
-
This is a good idea, but a much better remote NV assy. would be even better! The RNV on Magnums seem to be very nice, tho I don't recall ever running one. There are still some drawbacks to the RNV, starting, needling & shutdown, so you just have to ask yourself if it's worth it. Some guys put the NV down, maybe with a plywood or metal skid to protect it, or just count on the LG to help out. Kinda depends on how you like to crash. Mine are mostly straight down. y1 I just buy spares. LL~ Steve
-
I like the McCoy solution invented decades ago. Replace the stiff piece of wire the needle valve is made from with a spring. I have never broken an McCoy needle by landing inverted. Can't say the same for ST needles.
Andy
-
The OS FP needle has a large spring on it. I can tell you that these will not take much abuse. HB~>
I know the remote needle is not as good at the FP or ST. I just can not afford to keep buying NVA's.
Paul H^^
-
that setup will work just fine. The biggest problem with the top mounted remote is that fuel tends to drain out of the loop up to the needle and over to the needle valve, which can cause starting problems. Be ready to choke the motor as soon as it fires to make sure the fuel gets sucked in to keep it running.
Occasionally the remote NVA on the OS's causes some slight run to run variations. That seems to be due more to the loose thread fit than anything. You'll notice that when the motor is running you'll be able to change the setting by pulling or pushing on the needle. A little spring coiled to fit inside or a piece of fuel line on the outside for some stiction can get rid of that problem. The laid over remote really does eliminate broken needle valves, but the steel plate mount only lasts about 200 flights before it fatigues and cracks. Get a sheet of 1/16 in. nylon and make your own bracket.
-
after a couple of flights you'd have to watch your fingers if you needed to adjust - HOT head right there.......
-
I have run rear needle sets ups on several airplanes. I set my son Sean's models up that way when he was young to keep his young fingers away from the prop. He REALLY appreciated that!
I have had nothing but good luck with that set up. The biggest draw back I ever had, was that I had to be real generous with the choke and prime when starting them, and sometimes they didn't shut off too cleanly. I learned to try to keep fuel lines as short as possible also. The shut off is cured with angling the back of the tank out a bit. I think it will help you on the occasional inverted landing.
Good luck and have fun,
Dan McEntee
-
I like the McCoy solution invented decades ago. Replace the stiff piece of wire the needle valve is made from with a spring. I have never broken an McCoy needle by landing inverted. Can't say the same for ST needles.
Andy
Here is my home made McCoy type needle valve. This 1/16 inch cable that I bought at an Ace Hardware store. When it takes a hit the cable bends but doesn't break Just straighten it up and it is as good as new. I have also used the three inner layers of a five layer speedometer cable.
(http://stunthanger.com/smf/index.php?action=dlattach;topic=6913.0;attach=20211;image)