4 engine TwinSync ready for flight testing  
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4 engine TwinSync ready for flight testing - 10/19/2006 7:30:09 PM   
yl5295


 

Posts: 459
Joined: 7/29/2003
From: Raleigh, NC
Status: offline 		OK guys here it is. Everything is done and ready to ship for flight testing. Anyone got a B17 or B24 (or anything with 4-engines) ready to fly? What could sound better than 2 engines in Sync - 4 engines in sync!!!!

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< Message edited by yl5295 -- 10/20/2006 2:06:42 AM >
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RE: 4 engine TwinSync ready for flight testing - 10/20/2006 2:21:44 AM   
yl5295


 

Posts: 459
Joined: 7/29/2003
From: Raleigh, NC
Status: offline 		I realized that this post left a lot explaining to do...

So here is how it operates.
1) In boards are synced together with one unit and out boards are synced together with the other unit.
2) They work like independant syncronizers until all four engines are running and the stick is moved above the sync point.
3) Then the master unit takes an average RPM of its two engines and sends it to the slave unit. This average RPM of the engines on the master unit becomes the "target RPM" of both engines on the slave unit.
4) So then the slave unit synronizes both engines to the target rpm rather than each others RPM...

Pretty cool...

So here are the what ifs...

1) An engine dies on the master. Master first idles the other engine (example: an inboard quits then other inboard goes to idle). The master now sends 0 RPM to the slave as the target RPM indicating that it does not have the engines in sync. Slave stops syncing to the target RPM from the master and syncs engines to each other. (i.e. outboards keep power on and stay in sync).
2) An engine dies on the slave. Slave idles it's other engine (no thrust differential). Master continues to sync it's two engines to each other with no change in RPM. Just like having two TwinSyncs.
3) An Engine died and now I am flying on two engines with a third at idle and a forth dead. Can I have power on three engines? Yes pull the stick to idle and throttle up. Now you have control of all three running engines. Two will be syncronized that are attached to the same unit. The third will run based on the throttle stick.

Any other questions?

Anybody want an 8 engine unit for a spruce goose? Otherwise I will probably move on to another project... I think the TwinSync now has all of the ifs, ands, or buts, worked out of it....

< Message edited by yl5295 -- 10/20/2006 2:23:21 AM >

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RE: 4 engine TwinSync ready for flight testing - 10/20/2006 3:25:00 AM   
gsmith6879


 

Posts: 279
Joined: 11/28/2003
From: Fort Gibson, OK, USA
Status: offline 		My next project is a Palmer C130. I have been using the TwinSync on my F83 and will use one on my Palmer OV10 Bronco. The twin system works great. I hope someone steps up to test this 4 engine system. I'm 1-2 years away from completion on the Herc so can't be of much help on the front end.

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       Post #: 3

RE: 4 engine TwinSync ready for flight testing - 10/23/2006 8:48:57 AM   
Bob Paris


 

Posts: 701
Joined: 11/4/2002
From: Lahaina, HI, USA
Status: online 		Hayyl5295,

I want a 4 engine sync. I have a four engine model hanging in my garage that I've not flown in over a year. It has 4 x 15's for power. A modified TwinStar to four engines.

I have two, three engine models, one with three .32's and one with three .18's...can I use the 4 engine sync on a three (3) engine model ?

Soft landings always,
Bobby of Maui

< Message edited by Bob Paris -- 10/23/2006 8:51:15 AM >

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RE: 4 engine TwinSync ready for flight testing - 10/23/2006 11:35:19 AM   
yl5295


 

Posts: 459
Joined: 7/29/2003
From: Raleigh, NC
Status: offline 		I just got an email from a guy building a big three engine plane on RC ScaleBuilder and like I told him - Yes. All I need to do is to tell the slave sync that it only has to sync one engine and you will have a three engine synchronizer.

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       Post #: 5

RE: 4 engine TwinSync ready for flight testing - 10/23/2006 2:30:25 PM   
BillS


 

Posts: 2990
Joined: 9/6/2004
From: Greensboro, NC, USA
Status: online 		I am working on a C 130 wing for another fuselage but my building skills are bad and oh so slow that it may be months before flight. Your need for Beta testing is more immediate than my completion skills.

For some time now I have thought that an engine fault warning was more important than exact syncronization. One of my friends has crashed a couple of twins due to the sound delay and not recognizing engine down until after the crash had already begun. Auto throttle back on engine fault would seem to accomplish problem alert very well. Another friend without twin experience has a P 38 that is about to become a hanger queen.

Where do you fly and we will come to Raleigh some Sunday?

Bill

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RE: 4 engine TwinSync ready for flight testing - 10/23/2006 11:25:20 PM   
nine o nine


 

Posts: 257
Joined: 5/22/2003
From: Leominster, MA, USA
Status: offline 		I have a B-17 with gas engines. Would the synchronizer work with these? I'd give it a try but getting wiring through the completed structure would be a real problem I think. I could work it out given some time though. I'm in the NorthEast so flying is done for the season. Mitch

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RE: 4 engine TwinSync ready for flight testing - 10/24/2006 3:01:17 AM   
yl5295


 

Posts: 459
Joined: 7/29/2003
From: Raleigh, NC
Status: offline 		BillS,

I lost a P38 (small one though - pair of .15s with a combat streamer tied to it - no big deal) due to a dead engine. I have continued to fly a twin engine combat plane that is competitive with the fighters though since then.

Then I stick built a scale twin... No way was I going to fly that without some kind of saftey system... Don't let him make it a garage display... this thing works... I can give you Ziroli P-38 references...

I built the TwinSync for my twin because I was afraid to fly it... (and my confidence is so high now I ordered a 90" P-38 this week that is going to be my Sunday flyer... I am going to put a pair of K&B 65 sporsters in the front of it - which has to be one of the worst running engines out there)... I can land a dead stick P38 but not a P38 with one engine..... The only two successful flights I had on my combat P38 was when it snapped I cut the power and dead sticked it in.

I usually get out about twice a month to either Lake Jordan RC club or RDRC. I may start going to Fayetteville some too because I am working on my turbine waiver and may start flying my jet down there.

My email is billw@nc.rr.com.

Nine-O-Nine,

Yes it will work in your plane...but...

I am open to finding a four engine beta tester with the following pre-qualifications:
1. They have to have a TwinSync and be familar with it in a twin engine airplane (I have tried to make it simple but it still gets complicated when you get into the details of making it work perfect). Success with a twin engine plane and the TwinSync is a requirement.
2. Be ready to install and fly. I find that 90% of the guys working on multi-engine planes will have them flying in a few years. They want the unit (which is good because it validates that there is a market). However, I need someone that can fly the unit and report on it with a quick turn arround.

I think I will have some people that can test it out before next spring... If not I will probably break down and put four engines on something or some one will offer a good four engine arf for a test bed... I just need a test bed that is ready to fly...

Bill



< Message edited by yl5295 -- 10/24/2006 1:26:57 PM >

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RE: 4 engine TwinSync ready for flight testing - 10/24/2006 3:53:59 AM   
Bob Paris


 

Posts: 701
Joined: 11/4/2002
From: Lahaina, HI, USA
Status: online 		Yl5295,
I'm interested in your coments about the K & B .65. I've run three of them, all with very nice results. True not the most powerful .60 class engine, but the idle and dependability for me was really good. I do run Perry Carbs on all my K & B's...and this is one sweet combination. I did learn that these engines take a long break in, but after...all have been very reliable for me. I ran both in .46~.60 class P-47's. Both side mounted with SlimLine pitts style headers. The engines make a nice deeper sound with these headers.

Where was your problem before with the engines ?

I'm sorry to hear your smaller P-38 is history.

When ever you have the 4 engine sync available for sale, I'll buy one. I've your twinSync now...in fact I was told it is on it's way back to me, after upgrade work.

Soft landings always,
Bobby of Maui



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RE: 4 engine TwinSync ready for flight testing - 10/24/2006 4:09:49 AM   
yl5295


 

Posts: 459
Joined: 7/29/2003
From: Raleigh, NC
Status: offline 		Bobby,

I sent you the email that the unit is on it's way back to you - i.e. you shipped it to me...

I am not trying to sell the four engine sync units yet. I am trying to find beta testers. Get your two engine sync unit working and then we can talk about doing a four engine unit - You don't have to buy it. I will do something like I did with the first 25 people on the TwinSync - just cover costs and a free upgrade to a production unit.

I will defer comments on the K&B 65 sportster to the engine forum... but I have not had any success with these engines...

Bill

< Message edited by yl5295 -- 10/24/2006 4:10:20 AM >

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RE: 4 engine TwinSync ready for flight testing - 5/16/2008 7:25:01 AM   
dandyboy


 

Posts: 1
Joined: 1/1/2008
From: , INDIA
Status: offline 		Bill

What price are you looking at for the 4 engine syncro?

dandyboy

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RE: 4 engine TwinSync ready for flight testing - 5/29/2008 5:45:24 AM   
Props4ever


 

Posts: 1212
Joined: 8/3/2005
From: Canada, ON, CANADA
Status: offline 		I am currently building Super Constellation, it's 3-4 months away from completion. I will be powering it with .40sz 4 engines. Would this system work for my model and if yes then what sort of price am i looking at?

Sammy

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< Message edited by Props4ever -- 6/12/2008 5:05:27 AM >

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