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General control line discussion => Open Forum => Topic started by: Casey on March 01, 2020, 12:29:54 AM

Title: Needle Valve Protector
Post by: Casey on March 01, 2020, 12:29:54 AM

Hi Everyone

Which needle valve protector design should I adopt between these 2 designs or are there even better designs?

Title: Re: Needle Valve Protector
Post by: GERALD WIMMER on March 01, 2020, 02:51:41 AM

Hello From my experience it is easier to make a needle valve assembly (NVA) less vulnerable then it is to make a protector that will survive all manner of crashes and inverted landings. Rotate the NVA towards the case or shorten the needle down or use a remote needle set up. A remote NVA set up works better on pressure then suction feed. Look at a few current combat models. Regards Gerald

Title: Re: Needle Valve Protector
Post by: bob whitney on March 01, 2020, 09:38:46 AM

what plane are u putting it on

Title: Re: Needle Valve Protector
Post by: Brad LaPointe on March 01, 2020, 09:55:53 AM

If it’s possible to install a Fora type NVA this works very well. Fine threads and very well protected.

Brad

Title: Re: Needle Valve Protector
Post by: FLOYD CARTER on March 01, 2020, 11:39:19 AM

Make a half circle of 1/16" piano wire and mount it into the maple motor mount.  Naturally, the wire must be taller than the NVA

Title: Re: Needle Valve Protector
Post by: Richard Entwhistle 823412 on March 01, 2020, 01:37:56 PM

Stop landing upside down!

Later
Richard

Title: Re: Needle Valve Protector
Post by: Peter in Fairfax, VA on March 01, 2020, 05:27:32 PM

I'd vote for the short needle.  Super Tigre and PA NVAs accommodate that well.

Title: Re: Needle Valve Protector
Post by: pat king on March 01, 2020, 07:39:06 PM

The ENYA spring shaft needle valve does not have a problem with inverted landings when the engine is mounted on it's side. The "pilot in training" landed my Ringmaster inverted many times.

Pat

Title: Re: Needle Valve Protector
Post by: Casey on March 01, 2020, 08:34:02 PM

I putting it on a combat wing

Title: Re: Needle Valve Protector
Post by: John Given on March 02, 2020, 04:32:14 AM

Quote from: Casey on March 01, 2020, 08:34:02 PM

I putting it on a combat wing

If you are using a bladder then definitely use a fine thread remote NVA.  It can be mounted for crash damage resistance and it gets your finger away from the prop.

Title: Re: Needle Valve Protector
Post by: Ken Culbertson on March 02, 2020, 12:36:50 PM

Get yourself a McCoy. LL~

Ken