Blade47

Bill: Just to let you know that the package with the updated IC showed today and I will get to testing it this weekend. Thanks again for your time.

delta4329

My Feedback: (1)

Bill:

I ordered a Twin-Sync from RCS today and find they are on backorder. Do you have a feel for when they will be available?
I'll be using it in my G&P Sales PBY-5A.

Thanks, Darrel

Never mind - I find that RCS will have them Monday, 3/19.

yl5295

My Feedback: (1)

I talked to RCS yesterday and let them know that the TwinSync's with glow drivers will be shipping early next week. That assumes that I do not have to fly out Monday with my day job. You should probably plan on them shipping from RCS to you before the end of next week. TwinSyncs w/o glow will be shipping to them in about 2 weeks time (I ran out of PCBs).

Build-n-flyer-RCU

My Feedback: (4)

Has anyone tried the system on high-RPM engines with tuned pipes? I am working on fitting a pair of Jett FIRE 50's and pipes in my Duellist and they are tuned to spin 17,000+ RPM on the ground. It would be awesome to have them running in perfect synch!!!

Walt

Robby

My Feedback: (18)

Walt...
As long as you do not exceede 29999 RPM it will work ..

Use the optional diametric magnets and insert them parallel
with crank on hub so to insure they don't fly out at high RPM..
Look at post #195 from yl5295 as there are pics and description
in post..
I would suggest highly putting in a non-magnetic piece on the
oppsite side of hub to balance it.. A piece of heavy duty landing
gear wire works..
I did it using the diametric mags and have <over>spun motors
to over 15,ooo RPM and it still worked great..
Plus I thought it an easier installation..

Robby

Build-n-flyer-RCU

My Feedback: (4)

Robby I think you meant post 192?

So the sensor sees the side (not the end) of the magnet through the side of the hub. OK that looks like a neat setup.

I am less concerned with detecting the high RPM than I am with with response time of the electronics, also whether any strange surging could happen during the transition when the engines come onto the pipes.

If I get this one ready in time maybe you can show me how to do another very low, very high-speed pass this summer? [X(]

Walt

Robby

My Feedback: (18)

The current unit will react properly, i.e.,, fast enuff....
Just don't use high speed servos and make damn sure
end points are at 100 or more.. And the more the better...
If you can get it set to almost the full 120 up/down will
make it so it is a ton more stable...
My original end points were liek at 50 and 80.. The unit
would hunt bad.. Having talked to BillW he said make
end points 100+.. Sure enuff.. No more hunt... So I
have since increased and yes,, makes a welcomed
difference..
If you didn't,, get the LED readout for the TwinSync...
It is a killer piece and is cool to watch...

Yeah.. RIGHT!! Bring lots of props and a spare nose wheel.. DUH!
Oh,, and put the retract switch in the proper location.. <heheheheh>

f308gtsi

My Feedback: (1)

Hello:

Great thread on a great product.

We are using the Twin Sync on two Yellow Aircraft P-38s with ZDZ 50s . Can a few of you post pics of your mountings used for the Twin Sync sensors. Hopefully somone has done this on a ZDZ gas engine. The ignition magnet will be used for the Twin Sync as well.

Should we add a second magnet or is one enough ?


Thank you in advance.

yl5295

My Feedback: (1)

The one magnet is enough. Just mount the sensors so that they can read it and there are a lot of pictures in this thread.

On a side note I will be planning on attending the Toledo show and hope to have several new products there (in the RCS booth). Not definite yet but that is my plan. I hope to meet many of the guys that have contributed to the development of the twinsync there. Besides the Twinsync I hope to have some really cool new things there.

BillW

Pilot44

My Feedback: (20)

This is how I installed magnets in my setup. They are 1/8"dia. and about 1/4" long. These are RCV91CD thrust washer/bearing for my KMP B25, will not be using spinner so had to go this route. Works great. As the washer has a machined opening around the circumference of the bearing, it lends itself nicely to this installation. The sensor picks up the magnets up to 1/4" from the outer circumference of the bearing so there is room to work with. And there is no problem with the prospect of losing a magnet at high RPM due to centrifugul force should the bonding agent fail, which would not be good. No way this magnet gets out of there.

You just need to orient the magnets for the correct polarity as the magnetic field is generated from the sides of these magnets rather than the ends. Test with the sensors for correct alignment before gluing in. The magnets are available from Bill Wike whom I forgot to mention initially, he has posted his email address just 2 posts after this post.

Used JB weld to keep in place, balanced the thrust washers/bearing by removing a small amount of material via 1/8" bit next to the magnet.

Jim

roltech

Great pictures of the magnet set up.
roltech

Michel

Hi
Pilot 44 , love youre set up , great pitchers . If you don t mind I d like to use youre idea , But were did you get the magnets ?


Cheers

Mike [8D]

yl5295

My Feedback: (1)

I sell these magnets direct $2.50 per pair. just email me at [email protected]

rchotdogpilot

My Feedback: (27)

Can I wire my Hall sensor from my ZDZ ignition in parallel with the twin sync? This would reduce mounting another sensor on the motor. If not, why?

Thanks

yl5295

My Feedback: (1)

There is a chance it will work but it is a very bad idea for several reasons:

1. This connects power and ground of the Twinsync (and receiver) to the iginition system and battery (interference is possible)
2. The hall sensor included with the twinsync is more than just a hall sensor (other circuitry in it)
3. The voltages may not be compatible (Twin sync hall sensor is power by 5V but outputs 0-3.3 volts

The right way to do it is with an optically isolated input from the hall sensor or read the rpm from the iginition with an optically isolated circuit. (I actually have prototype that do this but have not productized them.

Pilot44

My Feedback: (20)

Mike,

Hardly my idea, Bill Wike posted a great diagram of the arrangement I used back in this thread somewhere. He is Johnny on the spot if you have questions.

Jim [8D]

rchotdogpilot

My Feedback: (27)

That would be another way around the situation, to read the RPM's from the ignition. I like it.

On another note Bill:

I know you have an "accesory port" for the LED display for the RPM's. I was wondering, would it be possible to modify your set up to have a testing programmer. What I'm thinking of, is a unit that will give me the ability to type in an RPM number and the engine maintain that RPM (on the ground) purpose would be to test thrusts of the engines and different prop configurations. It would be a neat feature, but not required. or maybe just a throttle hold function. But for some reason I remember something about this.

yl5295

My Feedback: (1)

Independant run up mode has throttle hold (at the programmed idle point).

It is possible to do what you are asking but there would not be enough demand to justify building it.

However I do have a new product I am working on that will do what you are asking. It is a governor/limiter. It is really for Helis or potentially extreme airplanes. You can select governor mode or limiter mode. In governor mode it holds the RPM at a defined RPM set with an Aux channel. In limiter mode it lets you control the throttle normally but will not let a preset RPM be exceeded.

There is one other option as well. I have a four engine sync unit that is basically two twinsyncs combined (one for inboard and one for outboard). One is master and sends the target RPM to the slave via the aux port. The slave would do what you are asking for you will just need a way to send it a signal (i.e. a master with a user interface)... It will be expensive though unless we build a few hundred. I think the governor/limiter is a better option.

Bill

Eric Lis

Bill, I sent you an email yesterday about the availability of the twinsync with glow. Will they still be available this week late? Thx Eric [email protected]

rchotdogpilot

My Feedback: (27)

opefully you'll have a version of the limiter at the Toledo show. Look forward to talking to you about it there.

branded

My Feedback: (9)

I just visited RC Showcase and am unable to place an order....Why????

yl5295

My Feedback: (1)

Unable to place order???

You will need to talk to them. I know that they are sold out at the moment and on back order. I have 25 units with glowdrivers ready to ship to them (would have shipped today but I had to fly out of town for the week with my day job so it will not ship unit the end of the week). The rest of their inventory should ship within the next 10-14 days. Sorry for the delays - my fault not theirs but I have had two weekdays at home the last 4 weeks. (work/day job interferring again with my hobby)...

Bill

branded

My Feedback: (9)

There's no mechanism in place on their site to place the order, other than call it in on the phone. That's what I meant......No link on the page to place the item in the Cart.....At least I can't find one...

orcrest

You have to use the online shopping link at the top of the page above the News & Events banner.

Here's a shortcut direct to it for you:

http://shopping.netledger.com/s.nl/c...tegory.2098/.f


Cheers

Da Orc

branded

My Feedback: (9)

Ah, thanks!