VQ A26 Engines 2-Stroke  
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VQ A26 Engines 2-Stroke - 2/19/2003 6:55:06 AM   
sj3cub


 

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Joined: 10/8/2002
From: Archdale, NC, USA
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Twinman Help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Got my vq a26 with the spring air retracts. Boy I can not wait
to fly. This thing is going to br sweet on a low full power fly-by.
Twinman, what do you think about the OS .32 SX for this bird.
1.2 BHP each. These are the same engines I plan on using in
my Top Flight DC-3. I want to have enough power to get off
my grass strip in a decent distance, but I want an engine that will inable me to cruise at around 1\2 power. I also plan on using
the expert gyro on the rudder for a little insurance.
I have been flying a 8 pound DC 3 on 2 OS .15 FP. Talk about a
handfull.

Thanks in advance,

Scott Morgan
       Post #: 1

VQ A26 Engines 2-Stroke - 2/19/2003 10:55:56 AM   
glyrenden


 

Posts: 25
Joined: 2/6/2003
From: burbank, CA, USA
Status: offline
I know that I'm not twinman, but,


I have an A-26, I have two OS46fx in it and it moves like greased llighting. 120 easy,, it is a very fun bird to fly.


just my two cents.

Later,
Jason

(in reply to sj3cub)
       Post #: 2

VQ A26 Engines 2-Stroke - 2/20/2003 10:09:19 AM   
nchrome


 

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Joined: 3/27/2002
From: Galesburg, IL, USA
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sj3cub I also have a Wing A-26 an I have TT40s on it and it flys fairly fast. My first take off realy didn't happen. She just didn't want to lift off. After tweeking the engines a little more at half the runway she leaped off the runway but for that first flite was a little nerve racking. Just take your time and make sure the engines are runnig at the same RPMs at open throttle and are reliable at all throttle setting. Detune the stronger engine to the weaker one orelse you will loose an engine on take off. And you just don't want to do that. If you loose one get to the ground as soon as possible DO NOT TRY TO THROTTLE UP AND MILK IT IN. Just get down to the ground fast and land the best you can. Better to do a few little things than to rebuild the whole thing.

(in reply to sj3cub)
       Post #: 3

A-26 Engines - 2/23/2003 6:20:02 AM   
twinman



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Joined: 1/19/2002
From: Katy, TX, USA
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Your killing me. Job keeps getting in the way of my hobby.....time to go buy lottery ticket!!!
I would agree with above posts. Minimum choice for me would be good .40's and .45's if from grass. This becomes more so if retracts and on board glow is added.
Yes, the OS .32's show 1.2 HP, but read the fine print...at some rediculous rpm figure!!!
While I do not recommend overpowering a twin (OK, so I do it, but do as I say, not as I do!!) an underpowered twin is much more difficult to fly and not something to enjoy due to the higher wing loading.
The other factor, is that if the twin is underpowered or sluggish, with two engines, it will not fly with one. I do not recommend that you try to fly with one engine until you get much to much practice at engine out situations. ( Did I mention the importance of engine reliablity, using two people to fly twins for safety, and always take the engines to full power, (with a copilot) and hold the plane up for ten seconds....everytime you fly!!!) (Opps back on the noisy soap box)
Good Luck

(in reply to sj3cub)
       Post #: 4

RE: Re: A-26 Engines - 12/22/2004 4:05:33 AM   
R/C Foolish



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Joined: 2/1/2003
From: BILLERICA, MA, USA
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Just ordered my VQ A-26. Was planning on using 2x Saito 56's. What does anybody think?

R/C Foolish

(in reply to John T)
       Post #: 5

RE: Re: A-26 Engines - 12/22/2004 4:19:11 AM   
twinman



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From: Katy, TX, USA
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The Saito's sound great, but prop them for thrust before scale. In other words, use two blade props until you are sure that you have good thrust. The orginal one that I built for a friend and did the build report for RCWARBIRDS.com had Magnum 52's and I was not happy with the result with three blade props. The owner changed to Magnum 61's. but a different prop and the difference was fantastic. I would assume that the Saito's are stronger. Sorry, I do not remember which prop he used.
Good Luck,
Twinman

(in reply to R/C Foolish)
       Post #: 6

RE: Re: A-26 Engines - 12/24/2004 3:50:54 AM   
twinman



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Joined: 1/19/2002
From: Katy, TX, USA
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You know, the brain is going with the hair.
About two years ago, I wrote this article for my club newsletter and just found it again.
NOW I AM NOT SUGGESTING YOU TRY THIS, but thought you would enjoy.

VQ A-26 Single Engine Test

I told you twins make you crazy.
Last Saturday, got a call from another crazy "twin" buddy with the VQ A-26 and two ST 45's two strokes. I think he wanted to get another plane. He has flown this for over one year.
He wanted to know if I would help with "experiment".....single engine flight test.
Not my plane!!!!! You bet!!! Grabbed the camera and was out like a shot!!!
No gyros, retracts, and Grapner 9x8 three blade props.
The test was to program each engine to separate channels, mix together, and bring the one engine to idle upon command. I did not say kill, even I am not that crazy!!!!
These engines are a bit over recommended power. Loops, inverted flight, and figure eights are all within reach. I know, he let ME fly his plane before......TEE HEE.
Anyway, took off to four or five mistakes high. Level flight, 1/2 throttle and idled the one engine.
The plane flew straight with only slight yaw, but slowing down, which is very dangerous. I yelled to go to full power on the remaining engine. Level flight was maintained and two circuits around the pattern were done. Note, for safety he turned into the running engine via throttle reduction, nose down, and throttle up after the turn. I have always been afraid of turning away from the running engine to avoid rolling over.
Now, I said flew level on one full speed engine and one idling. I did not say loops or climbing!!!
I suggested inverted low pass, but he talked bad about my forefathers at that point. No sense of adventure.
In summary, with this plane and good engine power, it will fly on one engine, relatively safely. Now, one dead engine and the drag of a stopped prop, will increase drag, but I believe it would fly.
This does not mean that you can 1. Take off with one engine 2. Lose and engine on take off and survive, Never take off without the vertical test of engine reliability. Lose an engine on take off and you will crash. 3. Never attempt to "go around" on this twin, on take off, or any twin. Once you are committed, bring the throttle to idle and Land, no matter where you are coming down.
Now, in my opinion, is this a trainer.....no. It is a scale warbird, heavy wing loading, and short tail moment. It does have a large rudder which helps. It lands faster than single pilots are used to. Yes, my buddy does land it slower than I do, but I really do not like any possiblity of tip stalls. Not as cool as P-38 in the air, but my heart beats slower.

Told you twins make you crazy.......now the disease is spreading.
Twinman

(in reply to twinman)
       Post #: 7

RE: Re: A-26 Engines - 1/1/2005 6:57:32 PM   
R/C Foolish



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From: BILLERICA, MA, USA
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I am working on my VQ A-26 with twin Saito 56's. I have the AUX-1 slaved to my Throttle channel on my Futaba 9-C. The Throttle Cut only works on one motor. How can I get it to cut both? I really don't want to use 1 channel and a y-harness.

R/C Foolish

(in reply to twinman)
       Post #: 8

RE: Re: A-26 Engines - 1/2/2005 5:21:00 PM   
twinman



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From: Katy, TX, USA
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I will fess up.........I never got this to work with throttle kill. I also have the 9c. I usually just left the knob active and killed the second one that way. OK, I am lazy, perhaps pose this question to the Futaba forum and let us lazy folks know.
http://www.rcuniverse.com/forum/forumid_125/tt.htm
Twinman

(in reply to R/C Foolish)
       Post #: 9

RE: Re: A-26 Engines - 1/2/2005 5:44:28 PM   
R/C Foolish



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From: BILLERICA, MA, USA
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Twinman,

I actually figured it out. Just go into AUX on the second page and assign the second engine channel to the switch you use for your throttle kill. Readjust your idle positions on the engines and you now have throttle kill for both engines activated by 1 switch.

R/C Foolish

(in reply to twinman)
       Post #: 10

RE: Re: A-26 Engines - 1/2/2005 5:54:01 PM   
R/C Foolish



Posts: 1051
Joined: 2/1/2003
From: BILLERICA, MA, USA
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Twinman,

Now that I have my engines (Saito 56's) mounted. It looks like only an 11x7 prop will fit. Would a 3-blade be better? What do you think about onboard glow igniter?

Thanks

R/C Foolish

(in reply to R/C Foolish)
       Post #: 11

RE: Re: A-26 Engines - 1/2/2005 6:17:54 PM   
twinman



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From: Katy, TX, USA
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Now you tell me!!!! Where were you two years ago??.......Thanks,
Tee Hee.
Twinman

(in reply to R/C Foolish)
       Post #: 12

RE: Re: A-26 Engines - 1/5/2005 9:01:57 PM   
xcellman


 

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From: Worthington, OH, USA
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I'm no expert, but I was just setting up the radio for my first twin the other day. I have a 9c and I used the thottle mixture feature for my number two engine. This is nice because you have a full curve to use to adjust the number two engine to match the number one engine. Throttle cut worked on both engines also.

(in reply to twinman)
       Post #: 13

RE: Re: A-26 Engines - 1/6/2005 1:37:25 AM   
twinman



Posts: 1628
Joined: 1/19/2002
From: Katy, TX, USA
Status: offline
xcellman,
We are humbled in your presence. Yes, that does work and in fact I use it all the time. Seems that you can never get both engines to come up together and this does work. You are "Mapping" one engine to the other. It can also allow or compensate the fact that one engine is ALWAYS weaker than the other and this reduces the urge to Tweak the weak on to the strong one. DON"T DO THAT!!! Always make the weak one a little rich and bring the stronger one down to the weaker one. NEVER the other way around.
One small point on the mapping. Note the rpm on each. Make sure that the general setting of the needle valve is similar to keep the ramp up similar. One way is to note the slight rpm drop when you richen the engines a little for safe running, that the rpm reduction is similar. Hopefully, you do not have to tweek the needle valves too much, but next summer when it gets warmer, you will have to reset them.
Good Luck,
Twinman
PS Now mix the engines to the rudder for better spins!! Do above 50% throttle setting for safety..,,,,,, Told you twins make you crazy.

(in reply to xcellman)
       Post #: 14