mr_matt

My Feedback: (10)

John great thread, really enjoy this stuff. i still remember your BVMF-100 and all the great painting and weathering tipsI got to see in the flesh.

can you bottom line something? What is the largest diameter wheels you can put in this model (and I assume the razor back version). they look so much better with the bigger wheels, i am just curious. I want a big gasser warbird but I don't know where to start, this thread helps a lot.

regards,


EDIT HOLY S*** Batman I just watched the video and see you are up to a 5 1/4 wheel, perfect. i guess this rules out the razorback!

John Redman

My Feedback: (8)

Hey guys, it seems the RCU folks have finally got the website working again. Tried to post a few times in the past couple of weeks only to have everything crash and fail. More updates will occur later today.

Ron101

My Feedback: (22)

looking forward to seeing more...

March 12, I hope these babies are getting closer to getting here and it's not another eflite habu or F-4 deal like to fly mine this spring

Ron101

My Feedback: (22)

Well looks like I better get my patience up on this one...
Hanger 9 moved the date out to ealry May now for this plane: http://www.hangar-9.com/Products/Def...ProdID=HAN4485

actually that is probably good for me I can get my yellow twin F-18 to the paint shop before it comes if I try real hard

I know guys get bent having to wait for Horizon stuff but the one thing I have learned is you guys get your stuff dialed in and it's better for us in the end

The Habu 32 was the same deal.... it took forever to show up, but once it did it's a really nice ARF. Same is happening with the F-4 now

So I'm pre paid on this one and will just wait it out

vasek

My Feedback: (4)

True. One can't say it's instant gratification for sure.

DMENACE

Guys


For those who do not like to weld,

How about this one for a pitot tube, a 1|4" dowel and scracht piece for the fin. I did use the body of the one supply with the plane, just cut off the round point right at mark and with a dremel take off the inside, with a round sander give shape to both sides of the pitot tube, testor silver paint, and there u have it. I merely light sanded the dowel to fit inside the antenna.

hope this helps,



Daniel,

DMENACE

Other side,

Regards

Daniel

John Redman

My Feedback: (8)

Very nice on the pitot tube Daniel.

These have finally shipped from the manufacturer and should be here soon. How come good things always take longer than you want?

Part 5 of the video build should be up later today. http://www.horizonhobby.com/article/...underbolt-30cc

Time for some inner gear doors guys!!!

John Redman

My Feedback: (8)

As most of you know RCU has had some serious upload issues over the past few weeks. I tried no less than 3 different times to upload this next series and failed miserably. It seems everything is back in check and working well. So here we go and lets hope the uploads work.

In making the inner wheel doors functional it was actually pretty easy and takes about 2 hours per door max once I figured out the main recipe.

You will need the following:

A dremel tool as listed earlier in the thread.

A 409 Dremel Cutoff wheel.
http://www.horizonhobby.com/products...wheel-36DRE409

(4) Dubro large nylon hinges.
http://www.horizonhobby.com/products...-duty-15DUB257

A small piece of .047" music wire from K&S.
http://www.horizonhobby.com/products...6-047-20K~S502

And of course our assortment of Plastruct for the inner door detail.

So time to get started.

John Redman

My Feedback: (8)

I dug out the inner wheel doors and scuffed the inside of each door with some sand paper. I wanted to make sure the epoxy would stick well to them while I glued the hinges on. Also I found some 1/16" plywood that I would be able to make the door horn out of for the clevis to hook too. I used a JR DS285 Sub Micro servo to actuate the gear doors. They fit in the wheel well very nice and work well.

pic #1 shows the parts laid out for the hinges that will be used on the inner doors.
pic #2 shows the tools used to cut the notches in the inner doors. The perma grit files from Bob Violett Models, a pair of trimming scissors and a razor blade.
http://www.horizonhobby.com/products...ssors-RDL73320
http://shopbvmjets.com/zencart/index...roducts_id=398
pic #3 shows one gear door with the notches made for the hinges. You will want the hinge to sit to where it is just inboard of the outline.
pic #4 shows both doors with hinges epoxied in place. You will note the piece of music wire used to connect the two hinges as you want them to remain in line so the door will not bind during operation.

John Redman

My Feedback: (8)

Next we need to prepare the wheel well area for the door hinges. This is easier than you think and only takes a couple of minutes.

pic #1 shows the removal of the inner lip. Remove all of this wood and sand flush with the main door outline.
pic #2 shows using the #409 cutoff wheel to cut a notch for the door hinges in the wing structure. There is a piece of 3mm plywood glued to the wing sheeting in this area. You will want to split the difference when you grind the round slot for the hinges. Take your time and stabilize the wing in a vertical position. With your dremel cut slowly and before you know it the cuts are done. I cut down to the shaft of the mandrel that the cutoff wheel is mounted too.
pic #3 shows both slots done and ready to accept hinges.
pic #4 shows the hinges mounted on the gear door and they have been trimmed with the curved scissors to fit the slots. You will also note how I have made a hinge pin out of the .047" wire and bent a short tab on one end for easy removal of the door once the entire sequence is complete.

John Redman

My Feedback: (8)

Time to fit the door!!

pic #1 shows the installing of the hinges into the slots made in the wing. The door is being set in place to check for operation.
pics #2 and #3 show the door in place and fit to the wheel well opening. You may rotate it through the full travel to verify operation and no binding.

John Redman

My Feedback: (8)

It is now time to fit the servos to actuate the gear doors. I used a square piece of balsa that was 3/8 of an inch thick as the base to mount the servo to. I sanded a slight contour to the side of the balsa that matches the airfoil. Servo is mounted using a servo tape. The arm is a standard JR arm using the longer side of the arm and the outer hole. The balsa block is the same size as the servo case and butts up against the spar and inner rib. It places the servo to about the perfect location for the door operation. The pushrod is 2-56 threaded rod and uses (2) Hayes Clevis's for actuation. Any clevis can be used; I just grabbed some out of my box.

I adjusted the servo linkage to where I was driving the servo at 140 - 150% of travel for total travel. I also used the DX18 gear door sequencer to sequence the gear door operation to the main retracts. This makes it easy and you do not require any additional radio accessories to complete the system. Also you will need to position the servo for the left wheel well door as shown in these photos. The servo for the right wheel door is positions forward of this door with the arm swinging over the back side of the servo. By setting the servos up this way I did not need to use separate channels for each door servo.

Pics #1, #2, and #3 show the servo installed and door pushrod position.

The control horn shown on the gear door is made from 1/16 inch plywood. The hole is 3 of an inch from the bottom and the horn is positioned to set the hole at 1/2 of an inch from the inner edge. Doors are actuated from the aft side of the door.

John Redman

My Feedback: (8)

Now take some of your Plastruct and build up the gear door to match the pictures just like we did for the main gear doors. Make sure to forma slight curve in them to match the airfoil. Paint it zinc chromate yellow and install for that final look.

Sekhet

My Feedback: (1)

Hi John,

Can you tell us what servos you used for the inner gear doors?

Also, I will probably be using my 9503, so can you recommend a easy to use gear sequencer?

Sekhet

My Feedback: (1)

Hi John,

Sorry to be a pain, but could you post pictures the servos on both sides, I’m having trouble visualizing how you set up other side.

Ron101

My Feedback: (22)

That looks great john... I'll be ripping off that idea too
inner gear doors are sweet!!

John Redman

My Feedback: (8)

Hey Cris,

Well you want to know what servos huh. DOH! Another homer Simpson moment.[:@] The servos are JR 285 sub micro servos.

I will get more pictures for you guys of the inside of the gear doors. Working panel lines and rivets at the moment. The bird is coming to life!!!

Sekhet

My Feedback: (1)

Hey John,

Thanks for the Info! I really like the way you’ve done the inner gear doors.

Electric retracts and doors are definitely the way to go, no more pluming air lines, installing door cylinders, messing with valves, hunting for leaks, and forgetting to pump up the system before takeoff (oops!).[:@]

TripleW

John,
Is that the Zinc Chromate from Aircraft Spruce? How do you like it?

Later, Walter

John Redman

My Feedback: (8)

Hey Walter,

Yes that is the Zinc Chromate Yellow primer from Aircraft Spruce and Specialty. It takes a few coats but works well. I am a happy camper!!!

For everyone else here is a teaser of the riveting on the stab. Main fuselage is done and I am working on the wing. She is coming alive with great looks.

Ron101

My Feedback: (22)

That looks great John
but I always wondered if you press rivets in ultra coat and you get bubbles in the film, when you heat it ...isn't going to pull out and distort your rivets?

sure look cool though

nitrofxr

John,
If a guy doesn't have DX18 radio for a gear door sequencer, can you recommend something economical to do the inner doors with?

Dangaras

Take a look on the hobbyking site, there is a gear door sequencer. Or you can look on sites like pw-rc.com for the gear & door sequencers used in the FMS brand models.


http://www.pw-rc.com/product_info.php/cPath/129/products_id/2207



www.hobbyking.com/hobbyking/store/uh_viewItem.asp

John Redman

My Feedback: (8)

Mitrofxr,

Here are a couple of quality gear door sequencers that most of the upper modelers have used for many years.

Jettronic Flexible Sequencer
http://dreamworksrc.com/catalog/jett...cer-p-765.html

JMP Electronic Door Sequencer
http://dreamworksrc.com/catalog/elec...er-p-1824.html