Vq A-26 Invader, Maiden  
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All Forums >> RC Airplanes >> Twin & Multi Engine RC Aircraft >> Vq A-26 Invader, Maiden
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Vq A-26 Invader, Maiden - 6/23/2003 10:01:12 PM   
samparfitt


 

Posts: 1647
Joined: 9/1/2002
From: West Chester, OH, USA
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Nothing fancy on the first flight.
Lots of rectangular patterns.
Using OS FX .46, inverted, with Master Airscrew 10X7 3-blade props and Wildcat 15/16 fuel.
Spring air retracts with VQ P-38 oleos.
Had to shorten the oleos to make them fit.
The front end looked weak to handle that nose wheel so I added more 'lumber' along the sides of the fuse.
She balanced out nice with the radio/battery just
behind the air tank.
Robart scale wheels.
A couple of GI Joe men for the cockpit.
Put remote glow at back of nacelles to keep
needed appendages away the business end.
Kept her 3 mistakes high.
Needed about 13 clicks down on the elevator, which I thought was correct before takoff.
One aileron was a little warped so I guessed on the location: off by 2 clicks.
On the final turn, idled her down and both engines
went dead.
This was probably good that both went out at once, she just came around and greased the runway.
Been having trouble with the engines.
The engines are from old warbirds and I've had to keep the idle up to keep them running.
Did successful vertical tests in the pit and on the runway so I took off.
Flying could have been a stupid decision with the engines not running at low idle. Won't go up again until the engines are purring across the entire RPM range.
Been playing with the low and high end.
About 1 turn out for the low end and 2 3/4 out for the high end.
Been thinking that maybe the mufflers are creating the problem.
Have 2 J-tec mufflers in my F-82 which I'll put into the A-26.
I've got the same size engines in the F-82: They were brand new but I can use them as a benchmark
for my high/low settings,
since they are running superbly.
Checked the new tanks and all look good.
After 20 or more flights on this,
I'll start on the VQ P-38.

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G. Samuel Parfitt
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Vq A-26 Invader, Maiden - 6/23/2003 10:50:40 PM   
TLH101



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If the plane was originally designed to have engines mounted sideways, or upright, you may need to check the tank hieght. They may be too hi for inverted engines. Remember when you invert the engines, you lower the needle valve assy quite a bit. Could be flooding motors.
BTW, looks nice.

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Terry
"Old Fart" in training. (not to be an R/Cer, but to be an "Old Fart")

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VQ A-26 Invader - 6/24/2003 7:30:27 AM   
JoeMamma



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Joined: 11/15/2002
From: Lenox Township, MI, USA
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Samparfitt,

Nice looking A-26 !

I'm in the process of finishing up my own A-26. I saved the installation of the cowels and plastic engine nacelles until last. This has turned out to be the most time consuming part of the assembly. What a pain to align and get them to fit flat on the wings.

I also installed scale wheels/tires. Because they are about twice the weight of the supplied "foamies", did you adjust the CG on your A-26 with them down or retracted ?


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Joe Mamma

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different mufflers made the difference - 6/24/2003 6:49:04 PM   
samparfitt


 

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From: West Chester, OH, USA
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Terry,
Good point on the tank location.
I checked them and they are cosher with the F-82
location.
I put the J-tec (JT-603) mufflers from the F-82 on the A-26 and flew last night.
I engines worked fantastic.
It was hard to believe mufflers could make such a difference.
She flew great; looked great with those retracts up.
She lands fast but came in nice and smooth.
Looked cool taxing back.
I need to adjust the nose wheel: a little too sensitive to rudder movement.
Didn't have to change the low end: just the high end to get them to purr across all RPM ranges.

Joe,
Those nacelles are a real b**ch.
My nacelles are only plastic (early model, don't know if the later models are different)and I used auto fiber glass(heavy duty) to line the insides of the nacelles. I used 30 min epoxy to
secure it. I had to do a lot of sanding to the plywood formers to get them to lay flat against the wing. Also, had to trim around the nacelle that went against the leading and trailing edge of wing. Also, had to make the wheel holes larger to accept the oleos and Robart tires.
I used the screws supplied to hold the top and bottom pieces together so I could get to the 'guts' when needed.
I made my nose wheel attached to a piece of 1/4" plywood and made slots so it could be easily removed for maintenance. Also, easier to put the
screws through the gear to the plywood outside of the plane. I put one screw through the plywood to the fuse so it doesn't slide out.
With the oleo's I had to enlarge the back of the retract hole in the fuse so the nose wheel would go into the fuse.
I used the button screws to hold the canopy's on. Also, the screws are nice for later maintenance.
Be careful on take offs: be sure you have enough
air speed before giving it up elevator.
I took off in about 100' and the plane's tail kind
of 'hung' for the first 20'. I think I was a little short on flying speed on take off and the tail was being 'pulled' by the engines.
This plane feels heavier than the F-82 so I think taking off is more critical that landing. Taking off without proper airspeed can work on those single engines but you might snap her on this twin.
Don't forget to put a tail skid on: I didn't see any supplied but for those 'just in case' landings. I just used a piece of oak wood.
In the box, there's a couple pieces of hollow, long grey painted plastic which I didn't know what they were for (also, pieces of white plastic that looks like a hat)!
Let me know how she works out.

On the CG: I did that with the retracts up.
I had to put the battery pack behind the air tank for final balance.

< Message edited by samparfitt -- Jun 24 2003 1:55PM >


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G. Samuel Parfitt

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MAIDEN + 5 - 6/25/2003 3:25:55 PM   
samparfitt


 

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From: West Chester, OH, USA
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Joe,
The engines are still running great.
She doesn't really go that fast compared to the F-82 considering it has two OS .46's: maybe due to the 3-blade props. She also flies much heavier than the F-82. Started doing some stunts.
They are crisp with the F-82. You have to make your 'movements' earlier to end up where you really want to go with the A-26.
One other thing about construction: The wing mounting bolts have to go through 2 deep wells to get to. I made the top fuse cover over the wing
removable. I used two 3/8" X 3" X (width of fuse extension)from light balsa to make two mounting extensions between the top of the wing and the bottom of fuse cover. Cut the covering away on the wing and epoxied them on.
I then used 4 button #4 screws to hold the cover fuse onto the extensions. After taking the fuse cover off the first time, I put some thin AC into the thread holes for durability. This makes it much easier to mount the wing to the fuse.

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G. Samuel Parfitt

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VQ A-26 Invader - 6/26/2003 7:35:14 AM   
JoeMamma



Posts: 145
Joined: 11/15/2002
From: Lenox Township, MI, USA
Status: offline
G. Sam,

Those 2 "hats" are upper and lower machine gun nacelles. Nothing was mentioned about these in the assembly manual. I made up a set of Browning .50 cal's and mounted them into these nacelles. I have two different A-26 books showing where the nacelles are mounted.

Two more strange pieces were discovered in the kit. I discovered they are landing gear cover doors (I didn't use them).

I'm using two OS 52 4-strokes for power, and a pair of Master Airscrew 13x8 (scaled out) 3-blade props. I fly a Corsair with this same prop, but the engine is a little larger; an OS 70 4-stroke. The 70 pulls it through the air with some authority. I hope the 52's work just as well with the 13x8's.

I'm using Robarts gear with Robarts wheels. Just as you did, I had to reinforce all of the wood mounts. Because the retract air tank had the fuselage pre-cut for a Spring Air tank, I had to purchase this tank separately.

I made up my own wing attachment plate using 3/8 inch plywood and 1/4 inch blind nuts. This was done after the original plate fell off in my hand !! The glue-barrel must have run empty the day they assembled THIS A-26 !! I had to use a lot of triangle stock to beef up the many poorly fitted parts. Hmmmm.........I wonder what the inside of the wing looks like ? Only time will tell !

After reading "Twinman's" many threads/replies, he suggested adding all of the rudder throw you can get. I believe I have about 2 inches per side. This should help me out in case of "flame outs".

Tonight I discovered Top Flite spray paint is not compatible with whatever VQ used on those plastic engine nacelles. What a mess. Looks like I'll need to sand off all of the original paint (I'm guilty of not trying out the Top Flite in an inconspicuous spot first!).

Summer chores, my job and spending too much time at the field flying are the things preventing me from finishing up my A-26. It's about 90% completed. I'll post some pics when it's done.

PS: My A-26 is the black, U.S. Air Force version used during the Korean War era.


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Joe Mamma

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RE: VQ A-26 Invader - 4/17/2005 9:06:47 PM   
R/C Foolish



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From: BILLERICA, MA, USA
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Flew my A-26 for the 1st time today. Powered with 56 Saito's it was awesome! Needed the whole runway to ease her up, but once it was in the air, it was incredible. The 4-strokes sounded great. Trimmed her out and she flew like a dream. Powered down and brought her in for landing. Balance is just right to keep the nose on the ground. Upon inspection after, the left landing gear block had come loose, good thing it didn't happen on the take off. Anyway it is an easy fix and will be ready to fly again real soon.

R/C Foolish

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RE: VQ A-26 Invader - 4/19/2005 10:32:00 PM   
allmetal plane



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Joined: 4/9/2003
From: Bridgewater , VA, USA
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5amp..

Congratulations on your maiden flight..

Would you please tell us how big is it and what kind of wing loading it turned out to be??

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RE: VQ A-26 Invader - 4/20/2005 1:28:53 AM   
Cutlass 60


 

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From: Bristol, NH, USA
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I was at the field when R/C Foolish took that awsome A 26 for his first flight. Those twin Saito's give a sound that is out of this world. Nobody was talking, just watching. Very, very impressive. As good as it gets!!!

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RE: VQ A-26 Invader - 4/20/2005 3:11:25 AM   
R/C Foolish



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From: BILLERICA, MA, USA
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Hi Bob,

It was pretty amazing that the Saito 56's didn't even stumble. They were smooth from take-off to landing. I pinned both of the landing gear blocks like you suggested and it is all ready for another flight. I made some cut outs in the bottom of the nacelles to get to the landing gear so I wouldn't have to take everything apart to get at them again.

See you at the field, bring your Twin-Air.

John

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RE: Vq A-26 Invader, Maiden - 4/20/2005 10:04:26 PM   
allmetal plane



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Dear Samparfitt,

Congratulations on your A 26 test fly!! Looks good!

Just curious, How big is it, What kind og wing loading does it have??

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RE: Vq A-26 Invader, Maiden - 4/21/2005 12:02:33 PM   
samparfitt


 

Posts: 1647
Joined: 9/1/2002
From: West Chester, OH, USA
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With only a 68" wingspan and at around 11 lbs, she's no fighter.
Response is like a bomber: delayed.
www.vqmodelaircraft.com
She looks good in the air, though, flying a normal bomber pattern.

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G. Samuel Parfitt

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RE: Vq A-26 Invader, Maiden - 12/4/2005 12:57:44 PM   
jmneissa


 

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Joined: 8/17/2005
From: New York, NY, USA
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I am curious because i am thinking of building one of these planes approximently how long is your runway my clubs is only 500ft will that be long enough?

Matt

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RE: Vq A-26 Invader, Maiden - 12/4/2005 1:41:51 PM