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burkefj's blog
Posted by burkefj | Mar 14, 2015 @ 06:15 PM | 2,619 Views
I'm now cutting a few kits for the SR-71, X-15, X-2, V-2 buzzbomb and F-106 Delta Dart which can be rocket gliders or built as pusher parkjets. I'm doing this as a service to folks who don't think they have the skill or access to the little bits and pieces. Since these are low production I'm hand cutting them and they take me over an hour to complete. Pieces are hand fitted and checked, many steps are pre-done, spars slotted/and/or installed, full flying tails installed or elevons hinged, horns installed, rocket mount completed, pieces taped for easy alignment after removal from the box.

SR-71 kit : http://www.rcgroups.com/forums/showthread.php?t=2083332

X-15 kit: http://www.rcgroups.com/forums/showthread.php?t=2275757

F-106 delta dart: http://www.rcgroups.com/forums/showthread.php?t=2070504

V-1 Buzzbomb: http://www.rcgroups.com/forums/showthread.php?t=2065112

X-2 Rocketplane: http://www.rcgroups.com/forums/showt...1#post26344459

InteR-Ceptor:http://www.rcgroups.com/forums/showt...0#post26259262

Price is $44.95 per kit. Shipping is actual usps priority cost to you(runs from $7-14 typically depending on distance) I can fit more than one kit into a box. The X-2 is $69.99 due to extra foam, carbon rods and time to cut and fit. Contact me via pm or burkefj@frontier.com for payment information.

Items Needed for completion:
Receiver
BEC(voltage regulator for receiver/servos)
2s Lipo battery
2 10 gram type servos, hs-55 hitec or similar
...Continue Reading
Posted by burkefj | Mar 03, 2015 @ 03:03 PM | 2,671 Views
My posted Plans are here:

Update 4/11/2015: Added large X-15 and InteR-Ceptor rocket glider plans.

http://www.rcgroups.com/forums/showthread.php?t=979395

Here is a link to my youtube videos which cover many of my builds:

http://www.youtube.com/user/burkefj/videos

Here is a great wing CG calculator I've used for some of my odd wing shapes.

wing calculator: http://wingcgcalc.bruder.com.br/en_US/?

For typical parts/equipment I use go here:
http://www.rcgroups.com/forums/showt...2#post30825101
Posted by burkefj | Feb 25, 2015 @ 04:37 PM | 3,653 Views
I was asked for my ME-163 komet plans that I had done a while ago. The first version I did used a single ply wing with a couple of spars, however due to the Balast needed to get the right CG, the wing had too much flex and I wasn't really happy with it. So I re-did the plans, doubled the leading edge of the wing, changed the spar type and location, added a cross spar, doubled the lower fuse to better withstand landings and made it a rocket glider. Step by step photos are included. I was almost able to keep it on one sheet, just the tail extension didn't fit.

One note: If you are going to build as an electric, I recommend a small motor at the nose, such as a grayson microjet V-3. The tail mounted version I did required a very big battery pack, 2100, to get the CG correct. To build as electric, just don't cut out the rear rocket tube cutout, and mount a nose mounted ply plate and motor. I've marked three CG locations on the plans, the max rearward used for rocket boost, the nominal flight CG which would be used to start for electric, and the glide CG which is nose heavy....

Bare airframe weight is 4.5 ounces, but needed 3.5 ounces of lead for CG, plus a 1.7 ounce battery to compensate for the rocket motor....AUW rtf unpainted is 13.5 ounces. I got in 9 flights today. The wind kept changing on me, so it was tough to judge boost trim exactly, but glide was quite nice and docile. I needed to increase both aileron and elevon throws to have good authority on glide....Continue Reading
Posted by burkefj | Feb 24, 2015 @ 11:32 AM | 3,328 Views
Here is the NARCON 2015 presentation I did on rocket glider and large rockets using depron. Hope you find it interesting. If you view it in slide show mode the bullets will appear one by one. It's in a zipped file, you'll need to unzip it. When you click on the youtube links you will need to minimize the power point and expand your browser youtube window.

Frank
Posted by burkefj | Feb 18, 2015 @ 01:45 PM | 3,546 Views
Hi, here is a quick rundown on common parts I use, the foam, servos, etc are all needed, the micro horns or carbon rod may or may not be needed depending on the model. You can always use cheaper parts, this is what I use and I know they work, ymmv.

Foam safe CA+ with accelerator for most glue joints.

3M-77 spray adhesive for laminating if needed.

Servos, I have used HS-55 servos for allmost all my gliders, they are light and I've had little failure using them. The hs-65 carbonite gear and HS-82 MG and HS-81's are all good too, heavier but more torque, not really needed for most of my rocket gliders.

Transmitter: I use a DX7, but this DS6i has most of the same features, 10 model memory, mixing, flap switch for glide trim...pretty inexpensive.
Receivers, whatever you are comfortable with. I fly spektrum and use the AR400 now as it is full range.
BEC, I use the castle creations 10a BEC for rocket gliders for providing good current to the servos and rx, a
You need a battery connector for this, I use a micro JST connector to the battery because that is the sort of connector my batteries have.

Transmitter: http://www.graysonhobby.com/catalog/...ly-p-1293.html

For rocket flight:

2S battery: http://www.graysonhobby.com/catalog/...ck-p-3096.html
receiver: http://www.graysonhobby.com/catalog/...er-p-1739.html
servos: 2 of these http://www.graysonhobby.com/catalog/...0&inc_subcat=1
bec: http://www.graysonhobby.com/catalog/...ns-p-1217.html
JST connector for the bec: ...Continue Reading
Posted by burkefj | Dec 23, 2014 @ 09:11 PM | 3,434 Views
I decided to try one more large rocket using depron structure. I chose the Jupiter C that launched our first satellite. I'm using a 29mm stuffer tube with a 14" long by 3" diameter parachute bay as the spine. Only ply used is a thrust plate at the bottom, and one at the upper section to attach the recover device to. A couple of internal ones to center the 3" tube.

I found a funnel at a craft store and trimmed it to adapte the satellite to the second stage tub.

The transition at the top is a little oversized due to the 3" tube going down into it.

I built up the second stage can using depron stringers and sheet. The satellite is made from bt-20 tubing which is slightly oversized.

Target weight is 53 oz rtf with a G motor, right now it might be an ounce or two over due to the density of the 2mm sheeting I got being higher than the online spec.

The altimeter has an access hatch held closed with magnets.

Right now sheeting is done, I just need to build the fins, and add some details.

Diameter is 7" and height is 82.5" long. It should handle most 29mm H motors as well as any g motor....Continue Reading
Posted by burkefj | Dec 14, 2014 @ 12:55 PM | 3,767 Views
When I was at KSC for the Orion capsule launch, I got some photos at the Canaveral air force base missile museum, thought I'd share them.

Highlights are the saturn V, orion capsule mockup, Atlantis, Navaho, Minuteman 1 re-entry vehicle, Pershing 1A nose cone, atlas booster motor....Continue Reading
Posted by burkefj | Nov 24, 2014 @ 12:03 PM | 3,263 Views
Decided to try one more large scale rocket using foamy build techniques....Idea is to take a rocket that typically needs lot of nose weight and build it light enough to fly on smaller motors. Using sims using normal 1/4" ply, fiberglass for the nose and LOC 7.5" body tube the balasted weight ready to fly is 20 pounds for this model with a proper CG location using J-570 motor.. My goal was to try to get it close to 3.3 pounds, final result ws 4 pounds 2 oz with balast less motor, motor required will be an H-128 minimum... I'll run altimiter deployment with motor ejection as backup. The hellfire requires about 1.8x the weight in the nose for every ounce of tail weight(motor) so you need to keep the rear end light. This is full scale, the Hellfire is 7" diameter and 64" long. The advantage of building this way is you can create your centering rings and sheeted tube to whatever size you want.

Using rocksim CP calculation which is less pessimistic than barrowman estimations shows the CP to be 31" from the nose and with one caliber of stability margin, CG should be at 24" from the nose, or just in front of hte middle yellow band.

I got good deal on 18" body tubsfrom sunward for $6 (pack of 5), couplers for $3, some leftover 6" 3.9" couplers for $4 each, and a 29mm motor mount kit(provided a tube that fit into the bt-55 and three 3.9 to 29mm centering rings)and used three sheets of 6mm depron and 2 sheets of 2mm sheeting. I...Continue Reading
Posted by burkefj | Nov 18, 2014 @ 11:17 AM | 4,034 Views
I've been wanting to try this for a while, the work I did on my Dyna-soar/Titan II got me motiviated. I do a lot of depron RC airplane construction, my thought was to do a model that typically needs lots of nose weight or is very heavy, and see if using stringers/centering rings and 1mm depron skin I could make a large light model to fly on E-15's......

The only wood in this model are two centering rings in the upper portion that are lite ply, and the balsa coupler I used for my BT-70 upper tube since it was handy at the hobby shop, the rest is depron sheet, cardboard motor tubes and some .04 styrene sheet.

For drawing centering rings I've been simply using a strip of cardboard, put a thumbtack in one end, and measure to the needed radius, poke a hole and insert my fine sharpe and draw it directly on whatever I need to cut, no need for a compass. This can be used for drawing cones or transition shrouds as well where you need a very long radius.

I cut a 7" by 2" triangle out of 6mm depron, grooved and glued in a 1/8" carbon rod which will take the brunt of the nose cone landing force....I then added perpendicular triangles, and took turns gluing in triangle filler pieces and carving those to match the original triangle pieces a quarter at a time...eventually I had nose cone shape. I left one quadrant unfinished so I could add weight if needed, then finish it. I added a few gradually increasing centering rings to get the needed outer diameter.

I cut off a...Continue Reading
Posted by burkefj | Nov 05, 2014 @ 11:40 AM | 4,079 Views
I've been wanting to try to adapt my X-20 to a titan booster. Since the X-20 is large and lightly constructed, the booster would have to be light enough and large enough that I could use lower powered rocket motors to keep the speed down so that it wouldn't rip the X-20 apart on boost. I wanted to try a center 29mm motor tube and use depron centering rings, longerons and a 2mm skin. I wanted the all up weight without motor to be 60 oz or less. For reference 60" of standard 7.5" loc cardboard tube with a coupler weighs 60 ounces.
Lots of photos so read the whole thread to see final construction photos of the booster....
Length will be 108.5" and 8" for the booster to be standoff scale with the drawing I have. I was hoping to use Aerotech G25's but I think it will be too heavy and too low a boost to ensure 200 feet altitude or better to arm the altimiter for deployment. I may have to go with CTI G-33, H42, H53 or H54 motors...All will keep the speeds down enough to be safe.

Here we go.

Here is the rocket simulation, and here is my original X-20 that boosts off a rail on E-6 24mm reloads, here is a quick video of it flying.

X-20 Dyna-Soar rocket boosted RC glider Launch Video (0 min 33 sec)


If this all works, the glider will be ejected via a piston that will also pull out the booster chute, and then I'll glide the dynasoar back. If that works ok, I may try doing an air start of the dyna-soar once released.
Posted by burkefj | Oct 31, 2014 @ 11:36 AM | 3,983 Views
Here is my X-15 rocket boosted RC glider,as a kit offering. 41" long and 20" wingspan, weight RTF is 9.5-12 oz for the aerotech reloadable 24mm D-7, E-7 and E-6 rc reloads. This will also fly quite well on the old D11P plugged motors. Or the Quest D5P motor available from Apogee components will work with appropriate adapter or taping it to fit.

I'm doing these one at a time, and they take me an hour and a half to cut, they are not laser cut, but are hand cut and fitted.I'm doing a lot of the work for you,. All tabs and slots are cut and test fit. Carbon wing spar is pre-installed as are the full flying tail surfaces. The motor mount is pre made. Basic steps are shown here along with instructions, basically the steps are gluing pieces together and taping.

Included:

Airframe with carbon spar and full flying tail surfaces installed
Nose weight
Pushrods
Motor mount
Rail buttons and screws or launch lug(your choice)
styrene strip for reinforcing
velcro for mounting rx/bec/battery
blenderm tape(for taping wires and reinforcing joints)

Needed to complete:
Receiver
BEC(voltage regulator for receiver/servos)
2s Lipo battery and nose weight, something around 1.5-1.7 ounces is fine, or use a lighter battery and add nose weight.
2 10 gram type servos, hs-55 hitec or similar
Transmitter with aileron/elevator mixing capability and ability to put elevator up-trim on a switch.
You will also need 3m-77 spray contact cement and foam safe CA+ and accelerator.
Depron...Continue Reading
Posted by burkefj | Oct 09, 2014 @ 06:45 PM | 4,216 Views
Had a great launch down in Amity Oregon, Gary Goncher got some great shots of 6' bomarc and 6' boeing ALCM in flight.
These were both flown with 29mm hardware and the new G-25 moonburner Aerotech reload. It's a great motor for these depron planes as it doesn't push them too hard, but has a good spike to get them off the pad, they both weigh 32-35 oz rtf. It's also nice because it uses the normal 29mm highpower motor hardware and not the more expensive and custom sized 32mm RC hardware. It's not as hard a thrust profile as a G-38 or G-40, but it's almost a full 120ns motor.

Frank
Posted by burkefj | Aug 10, 2014 @ 08:50 PM | 4,456 Views
I had built a 30" long natter rocket glider back a few years ago, designed for estes E-9's or E-6 aerotech motors. The AUW though due to the forward CG was 13 oz and the wing area was a bit small for a good glide.

The original full flying tail was a bit big on this upscale, so I trimmed the inboard ends and mounted them permanently to the tail which helps stiffen it, and then just did full flying outer portions. I mounted the servos on the underside of the fuse and just angled the pushrods up to the tail surfaces and they lined up nicely. I added two parallel carbon struts from the tail to the fuse to prevent slight twisting under hard roll inputs.

I decided to do 136% upsize to make the length 41" and just fit onto a depron sheet at an angle. This gave me almost 2x the wing area and the Due to the longer length and same tail weight, the nose weight was reduced somewhat and AUW came in at 15 oz rtf.

I used some olive model master spray for the body with some flat gray camo using a cardboard stencil/template I made. I used some silver sharpie to do panel lines and a bit of trim monokote for the windows.

I used some thin styrene sheet laminated on the outside of the depron to support the pivot rod for the tail and to help prevent twisting. Had two test flights today, boost was nice and straight and glide was very slow and docile, a lot nicer than the original smaller version. I now have 11 flights , just put in a bit of downtrim for boost setting and reduced uptrim for glide to make it more hands off.

Here's the video..:

Scratch built Bachem Natter RC Rocketed boosted glider (1 min 22 sec)


Frank
Posted by burkefj | Feb 03, 2014 @ 01:55 PM | 4,219 Views
Posted by burkefj | Jan 27, 2014 @ 12:53 PM | 6,172 Views
I've been going through my old designs/plans and slowly re-doing them for public consumption, originally I did an F-8U-III super crusader which was basically a similar design except for the nose and intake. I decided to make it a straight crusader this time. You could take these patterns and make a pointy nose and curved intake snout and re-do it as a super crusader. There are slight wing differences but probably not enough to notice. On the super crusader you'd have to figure out a way to model the ventral fins which are either horizontal or vertical and quite large, on mine I just created some ventral strakes that sort of modeled them from the side view in takeoff position.

I used a center piece with tail and then two doublers on each side to give me enough thickness to give a nice rounded nose and intake.
It would be easy to add some formers or pink foam and add thickness to make it fully 3-d.

Originally I mounted the wing on the top of the fuse with some tabs and glued a fairing cover over the top. On this version, since the real plane has some airfoil thickness, I decided to pick the most forward point of the wing leading edge and use that for the slot location. I think it looks ok like this and allows some foam above the wing to hold it in place and model the fairing that is on top of the wing. In order to lock the wing in place, I'll drive some 2" pieces of 1/8" carbon rod down through the top of the fuse through the wing and into the body and...Continue Reading
Posted by burkefj | Jan 23, 2014 @ 02:50 PM | 5,300 Views
SR-71 rocket boosted RC glider, length 41", wingspan 22", weight rtf 9.5-11 oz using Aerotech D-7, E-7, or E6 24mm rocket motor, or the Quest D5P motor with adapter to fit it to the mount.

I'm doing these one at a time, and they take me an hour and a half to cut, they are not laser cut, but are hand cut and fitted. I'm doing a lot of the work for you, the wing surfaces are pre-hinged and have control horns attached. All tabs and slots are cut and test fit. Carbon wing spar grooves are pre-cut. The motor mount is pre made. The lower fuselage spine is pre-laminated. Basic steps are shown here along with instructions, basically the steps are gluing pieces together and taping.

Included:

Airframe with surfaces hinged and horns installed
carbon spars
Nose weight
Pushrods
Motor mount
Rail buttons and screws or launch lug(your choice)
styrene strip for reinforcing
velcro for mounting rx/bec/battery
blenderm tape(for taping wires and reinforcing joints)

Needed to complete:
Receiver
BEC(voltage regulator for receiver/servos)
2s Lipo battery and nose weight, something around 1.5-1.7 ounces is fine, or use a lighter battery and add nose weight.
2 10 gram type servos, hs-55 hitec or similar
Transmitter with aileron/elevator mixing capability and ability to put elevator up-trim on a switch.
You will also need 3m-77 spray contact cement and foam safe CA+ and accelerator.
Depron compatible paint(model master/testors non laquer are ok)
silver sharpie for panel lines if desired.

Wing loading is quite light and glide is very docile. You boost vertically on any standard pad with rail or rod, and keep the model flying straight up till burnout, then pitch over, set up your glide trim and enjoy.


Here's the flight video:
SR71 Rocket boosted RC glider Kit flights (2 min 17 sec)

Frank
Posted by burkefj | Jan 17, 2014 @ 01:13 PM | 6,795 Views
I decided to do another Phantom build, make a few changes to the original and plans. I originally did these because there weren't great simple plans for a phantom at the time. I'm not a big fan of mid mounted engines or box fuses, I'd rather have a slim profile, gives less drag in the air and is quieter. It does require you to mount equipment on the bottom of the wing has the battery mounted on the front side of the nose, but I'm ok with that. Due to the thin profile the wing hits the fuse further forward than on a normal fuse. If desired, you could alter the top view of the wing to include the intake profile and nozzle profile on the rear of the wing so that the top view was more representative, I considered this and decided to leave it clean. If you do this you may need to do some glide tests to confirm CG did not shift as the intake profile will add forward wing area. The wing is not mounted on the bottom, but is in a slot, I did this to give a bit of area under the wing to mount the electronics and not get destroyed on landing.

Maiden video at:
Scratch built RC F-4 Phantom II pusher parkjet (3 min 12 sec)


Here is the Rocket boosted flights...

F-4 phantom scratch built parkjet/rocket boosted glider (2 min 0 sec)
...Continue Reading
Posted by burkefj | Jan 13, 2014 @ 12:41 AM | 6,267 Views
While recovering from my foot surgery, I was watching all sorts of youtube videos on F-105's etc.....Then I realized I don't have any enemies for my thud. I decided to go back to my original Mig 21 profile and change it to a cruciform style instead of a true profile fuse...This saved a bit of weight, but meant the CG would have to move forward a bit. It did give more surface area though so the wing loading would decrease. I went back to my mig thread and saw some pictures a guy had done with panel lines so I went that route. Looks like rtf it will be about 11.5 oz. Did my normal rocket motor mount so I can do rocket glider or with my pusher pod installed.

I went with Czech markings as I have some bohemian in my blood....

Maiden went well, was a little too nose heavy, so removed some weight and it flies really nicely, was a bit windy today.

Mig 21 profile pusher RC parkjet (3 min 42 sec)


Frank
Posted by burkefj | Jan 06, 2014 @ 06:36 PM | 6,844 Views
I discovered that the evergreen aviation museum has a thunderchief now on display....It was a nice sunny day so I took some photos....didn't take me long to decide to upscale my original 3mm micro version to 6mm and 39" long...Kinkos did the scaling for me from my original plans. I decided to use a doubled central fuse with two side doublers, and 3mm covers over the rocket mount that also doubles for mounting my grayson microjet motor. Plane is already framed up awaiting an esc and maiden to confirm the CG. I stuck with a full flying tail only. This is a single seat D version. Not sure on the colors yet, I'll probably go with the light bottom and camo top like these photos..... Here are some pictures from Evergreen.....The original small version, and my newer version.

Update 1/7 Finished the painting, now just need to do some panel lines, a few letter markings and wait for my ESC.

Update 1/8 Finished the markings and panel lines, esc is in today but rain for the next week Looks like right around 14 oz rtf.

Update 1/13 Maiden went well, CG was right on, was very windy today but handled it well.

Video will be at:
F-105 Thunderchief RC parkjet (2 min 17 sec)


...Continue Reading
Posted by burkefj | Jan 06, 2014 @ 04:58 PM | 6,857 Views
F-106 Delta Dart Kit weight RTF is 10-12 oz for the aerotech reloadable 24mm D-7, E-7 and E-6 rc reloads. This will also fly quite well on the old D11P plugged motors. Or the Quest D5P motor available from Apogee components will work with appropriate adapter or taping it to fit.

I'm doing these one at a time, and they take me an hour and a half to cut, they are not laser cut, but are hand cut and fitted.I'm doing a lot of the work for you, Fuselage sides are laminated with a carbon nose reinforcing, wing spars are pre-slotted, Elevons are pre-hinged. The motor mount is pre made. The joints I've cut to fit it into the box are pre-taped with blenderm, so you unfold them, apply CA+ to the joint and they are ready to be assembled...

Basic steps and instructions for download are shown here basically the steps are gluing pieces together and taping.


Included:

Airframe pieces with carbon spars, elevons (pre-installed)
Control Horns
Nose weight
Pushrods
Motor mount
Rail buttons and screws or launch lug(your choice)
styrene strip for reinforcing
velcro for mounting rx/bec/battery
blenderm tape(for taping wires and reinforcing joints)

Needed to complete:
Receiver
BEC(voltage regulator for receiver/servos)
2s Lipo battery and nose weight, something around 1.5-1.7 ounces is fine, or use a lighter battery and add nose weight.
2 10 gram type servos, hs-55 hitec or similar
Transmitter with aileron/elevator mixing capability and ability to put elevator up-trim on a switch.
You...Continue Reading