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burkefj's blog
Posted by burkefj | Dec 31, 2013 @ 12:22 PM | 5,912 Views
Well, my son got his learners permit so I had him drive down to the Evergreen Aviation museum for some practice, got in some flight time on my dart at the RC field there and took some photos of the Dart they have. Right next to it is a dagger, and while I like the dart a bit better, I figured I could modify the airframe slightly of the dart, keep the same wing/CG and create a dagger as well. I've got the plans and parts done and cut out, it took a bit more work, and some extra pieces. The canopy is moved back and the nose portion is relatively longer. The tail and speed brake shape are different. I created some wing strake pieces and the tail strakes as well.

For the rear engine humps(my name) they lined up perfectly with where I wanted my motor mount so they posed a bit of a problem. I finally wound up laminating two 6mm pieces with just the outer ones having the extensions and they sort of surround the microjet motor.

Maiden video at:
F102 Delta Dagger RC parkjet or rocket boosted RC glider (3 min 45 sec)


Plans are on the plans page.

12.5 oz rtf with the same components I used on the six.

...Continue Reading
Posted by burkefj | Dec 29, 2013 @ 07:00 PM | 5,888 Views
I've always wanted to do a dart, but there have been a lot of them and so I never got around to it till now. This takes a single sheet of 6mm 26.5x39" depron. I used one piece of tubular 1/8" carbon rod to do the wing spar, pushrod reinforcements, and nose reinforcement. No other carbon needed.

You simply print out the plans making sure they are not scaled and you are using borderless printing. Then cut out the templates and mark the depron. Once you have marked the right and left fuse sides, you can cut out the intake doublers and make a left and right of those as well. Only half the wing is shown, simple flip over and trace the other side. Cut out the depron. I grooved and inserted a piece of 1/8" carbon rod in the nose running to about 3" aft and below the wing leading edge to reinforce the nose. I used 3M77 spray to joint the right and left sides. I then sanded the rounded portions of the nose and fuse/vertical stab. Once that is done you can slot for the wing. I then rounded the left and right intake doublers and glued them with 3m77 spray just above the wing slot. You can cut out for the motor tube if you are makiing a rocket glider, or cut out to fit your motor. If you are mounting the motor on a plate you should put a small piece of carbon rod in the middle of the motor plate and drill and glue that into the tail to give it some strength. Make sure to leave clearance for the prop to clear the speed brake extension.

I then did...Continue Reading
Posted by burkefj | Dec 29, 2013 @ 06:47 PM | 1,795 Views
Here is my V-1 Buzzbomb rocket boosted RC glider,as a kit offering. 39" long and 26" wingspan, weight RTF is 11.5-12.5 oz and designed to fly on 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 foam safe CA+ and accelerator.
Depron...Continue Reading
Posted by burkefj | Dec 22, 2013 @ 03:18 PM | 5,833 Views
Flight video
Scratch built V-1 Buzzbomb RC pusher parkjet (4 min 7 sec)


I've been slowly going through some of my less flown rocket gliders to convert them for pusher so i can give them some more flight time. Normally this means a slight modification of the motor clip to use my grayson microjet V-3 that is mounted on an adapter. I have to swap a 20a esc for the BEC, and install the motor wires back to the rear and then re-balance. Most of the time I can just use an 800mah 3s pack for this motor on planes up to 16 oz. I normally use a 8002s pack for rocket boost and have the CG set for that, and with the pusher and the 3s pack I normally only have to add a quarter ounce or so to get the CG back to spec.

I decided to modify my Buzzbomb but thought a tractor setup would be better since I wouldn't have to trim the rudder to clear the prop if I did it as a pusher. I considered doing a tractor in the front of the pulsejet pod but there wasn't enough prop clearance in this small of a model(I had done it that way on my larger buzzbomb back in the day).

Well, it was a very interesting day yesterday. Really strange behavior, like it was tail heavy. Had to run it very nose heavy to get any control at all. Had all sorts of adverse yaw in banks. I tried all sorts of down and right thrust and it was slightly better. Finally upon suggestion I tried a bit of aileron reflex and it got better, but still wasn't flying normally. I finally concluded that the rotating...Continue Reading
Posted by burkefj | Oct 20, 2013 @ 11:10 PM | 6,754 Views
Since I lost my original B-58 in a tree several years ago, I've been missing it.
So, I broke out the plans, made some modifications, and decided to save a bit of weight, would just keep it in the white, which also allowed me to do panel line detail.

It is 12 oz so far, without esc, motor and battery. 32" ws and 49" long. I doubled all the way to the fuse nose this time, and used 6mm doubled on the motor pods in this version.

I didn't want to splice that much so I used four compete 27.5x39" depron sheets and there was a lot left over, I only spliced the center section nose about 10" or so. Not much carbon needed, just some strip in each engine pod, two wing spars and a tail strip for stiffening. I did use some leftover spar rod in the tail to secure the motor plate to.

Here's the new video...

Scratch Built RC B-58 Hustler pusher parkjet (1 min 54 sec)




Frank
Posted by burkefj | Oct 14, 2013 @ 12:23 PM | 6,663 Views
I had two very successful flights this weekend in Brothers, Oregon, and a bit thanks to the John Lyngdal, Gary Goncher, Tim, the other Tim, and Robert for helping out, and to all the OROC folks for putting on a great launch, and providing a great dinner, and to my wife, Sophie for helping out in the cold.

First flight was on a J-570 and was perfect, just a slight 5 degree angle caused by wind about 100 feet up, missileworks micro altimiter worked perfectly, 1300', no damage. Second flight was on a J-510, slightly more tail heavy, video will show a slight wiggle then it straightens out, again, perfect altimiter deployment with motor backup, 1700' and zero damage on landing. Very rewarding project and looked very good flying.



...Continue Reading
Posted by burkefj | Oct 11, 2013 @ 01:08 PM | 2,644 Views
Here is my X-2 rocket boosted RC glider,as a kit offering. 39" long and 34" wingspan, weight RTF is 13.5 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 two hours to cut and fit, 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 spars are pre-fit as are the full flying tail surfaces which have the torque tubes installed. 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 with torque tubes 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...Continue Reading
Posted by burkefj | Oct 01, 2013 @ 06:59 PM | 7,133 Views
Here it is, the InteR-Ceptor rocket boosted glider kit. 42" long, 18" wingspan, 10 oz rtf for 24mm D-50p, D-7, E-7, E-6 rocket motors, and older D11P's would work as well. Has that classic sci-fi long range interceptor look, simple profile construction. Much of the work is done for you, full flying tail surfaces installed, wing grooved for spar, rocket mount completed. Simply unfold, glue, tape, install radio gear.

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 foam safe CA+ and accelerator.
Depron compatible paint(model master/testors non laquer are ok)
Black sharpie for panel lines if desired.
Decal/vinyl accents, stars/bars etc.

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.

I have a few sets of machine...Continue Reading
Posted by burkefj | Jan 08, 2013 @ 03:59 PM | 6,356 Views
My name is Frank and I'm a cat-a-holic....could even be called a hoarder of cats....they all came to me in different ways and I love them all. Below are 5 of the 7 I currently take care of....

Current collection........

Tommy: He's my secret favorite and my good buddy, he is the sweetest cat you could imagine. My daughter and I picked him out of shelter with his sister, Coco.

Baby: He wandered in to our house last thanksgiving day, and went to sleep on the couch. He's small but doesn't take any crap from the others. He is quick to talk to you and purr loudly, he always wants a snack....I don't know why he doesn't weigh 40 pounds....

Mischa: He reminds me of a meercat.......We got him from a shelter with his brother Sascha, they were the cutest twins....we had to use colored collars to tell them apart...Mischa sleeps in the strangest positions.....He is like a coiled spring. He sits outside the patio door at night and jumps up to catch bugs, he can jump about 5 feet high.......dude has air...

Sascha: He likes to sleep in the sink or any other small confined space....

Cairo: He's a big doofus and whines a lot, but he'd never hurt a fly...we took him from our daughters schoolmate when they couldn't take care of him. He used to have a long face and looked very egyptian, which is why we named him Cairo, now he looks more like a B Kliben cat....

Cubby: He was dropped off at our neighbors house when he was 5 weeks old in a paper bag....we took him...Continue Reading
Posted by burkefj | Dec 25, 2012 @ 08:46 PM | 9,454 Views
Thanks to my lovely family who got me enough foam, and electronics to make another rocket glider. They also gave me a half a day repreive yesterday and today to work on it. I've been wanting to try a spaceship one , but have been worried about CG, twisting and stiffness of the tail booms. It came out ok, I wound up having to put some parallel stiffeners on the bottom of the wing to help prevent twist.

I couldn't find a decent 3-view that I liked or thought was right, so I just did this freehand from a book I have from pictures and relative sizing. I think it captures the look if not perfect scale. The full flying control surface placement was dictated by the fact that I wanted to put the pivot rod accross the fuse and tie it in just in front of the rocket motor mount. This helps reduce the twist of the tail booms and worked well, and actually came close to where they are supposed to be. Since I was doing a cruciform structure, I had to move the wing placement to the middle of the fuse instead of the upper portion, but I don't think it makes that big of a difference in look. I did not add the later stub strake fins in front of the control surfaces yet till I fly it and see how it does without them. Due to the lack of stiffness of the booms, I glued in carbon tubes in each one and laminated a 3mm cover over the tube, that made them very stiff. The wing still had some twist so I used two carbon tube spars as well.

I mounted the servos as far forward as I could to...Continue Reading
Posted by burkefj | Dec 20, 2012 @ 10:47 PM | 9,283 Views
I decided I wanted to try doing one of the proposed Delta wing configurations for the X-15-3 plane, I chose the one normally modeled with the diamond wingtips...I made it simply by taking my X-15 plans, stretching the fuse the scale amount(about 10 inches) and changing the top view to a delta with wingtips. I added some 3mm covers on the sides of the fuse to sort of give it a look like the fairings had. It gives it a bit more body. It's all completed except for painting now, and the fairings added quite a bit of stiffness to the body. It came out at 55.5" long and about 21" wing span which is slightly oversized just for wing loading. Weight is right at 13 oz rtf, but without paint, so assume about an ounce more finished.

Update 12/21/12 Since the world didn't end yet, i had enough time to paint the Delta X-15 and do the markings. Came right out at exactly 14 oz rtf. Pictures show it next to the X-15-2

Update 12/27 Good maident this morning. CG and throws were spot on as was glide trim, very nice!
Here is the cg calculator I used:

http://wingcgcalc.bruder.com.br/en_U...d6=0&sweep6=0&

Flight video:
X-15-3 Delta Configuration RC Rocket boosted glider (0 min 41 sec)

Frank
Posted by burkefj | Nov 13, 2012 @ 01:32 PM | 9,317 Views
I've updated my Bomarc plans to reflect the A or B model wing/ramjets. I redesigned the ramjets to not have an X form but just double of the side view and it looks like it will work fine and weigh the same. I think it makes a cleaner look. I built this one as an A model with the wing and pods moved back and AUW rtf is 11.3 oz with an E-6RC motor.

Doing the ramjets by doubling them allowed me to round them more and it gives a better shape, I think.

I did the markings on the pieces/painting first before assembly and was very careful with the CA when applying to avoid running the marker lines. I used model master "titanium" for the ramjet rear ends, and some Q-tip shafts for the pitot/counterbalance probe thingys...

I used styrene sheet on each side of the fuse to support the rail buttons as well as give something solid to drill and glue to when attaching the ramjets.

I also added styrene strips to the bottom of the ramjets to help them survive landing rash as well as the underside of the nose, and used contact cement(uhu por) to attach it. I don't indicate that in the plans, if you land on trimmed grass it probably isn't necessary, but I already had the styrene on hand.

I did this one in a slightly different white color scheme I found with a black nose and use sharpie pens to do the panel lines/accents, sig stars and bars and vinyl letters from Office Max.

Build time was approx 8 hours including cutting plans, dry fitting, markings and finishing.

Test flight in 8 mph winds was good, boost was vertical, just a bit of weather cocking at the end of the boost that was easily adjusted back to vertical. Glide setting was fine. This is using the same relative CG position (relative to the wing LE where it hits the top view fuse profile) as the B model. IE mark the wing as shown on the plans for CG, move the wing back to the A model position and the same CG markings will apply.

Plans are updated on the plans page.

Frank
Posted by burkefj | Nov 07, 2012 @ 05:09 PM | 10,521 Views
I was on a business trip and was able to stop by the White sands missile range and the alamogordo space museum. I have to say that seeing a bunch of those rockets and missiles I have built models of was really exciting. I was able to actually touch a Pershing and Bomarc Missile The Talos is a huge missile. Hopefully you will enjoy the closeup shots. They had their V-2 refurbished and it is one of the most complete V-2's in existance. They had it made into a cutaway so you can see the internal structure and tanks, etc. They had some of the V-2 skin left over and were selling it mounted on a base, so I bought some real german December of 1944 V-2 skin I'm such a dork. Really, I'd encourage anyone in the area to go to the white sands missile park, it was outstanding.

...Continue Reading
Posted by burkefj | Oct 22, 2012 @ 12:14 PM | 7,170 Views
I decided to try a 1.5x upscale of my full fuse AGM-86A ALCM.

Wings have a spar and are laminated, and full flying stabs are built and laminated.

Update 10/28 Cut out the top and side views and tab and slotted them, installed the motor mount, thrust plate, tail torque rod and vertical reinforced with carbon and laminated with 3mm depron.

Update 10/29 Added the formers and lightening cuts, and cut and fit the top nose plate. Just need to add strips at the top and sides to attach the sheeting to.

Update 10/30 Added the strips and added the rear sheeting after installing all electronics and the wing. Added in the hatch for the battery and did an initial CG check. Just need to add the forward sheeting, sand and apply markings.

Update 10/31 All finished. I used vinyl letters from office depot and stars and bars from sig, All the rest of the markings are just hand cut from self adhesive trim monokote.

I've now flown it on the new 29mm Aerotech G-25 which is a perfect motor for the model. Since this motor has a bit more thrust, to keep the speed down and reduce change of flutter on the wings, I've added 5 oz of ballast at the CG location and it doesn't really impact the glide at all. I really like this motor for all of my upscales. AUW rtf is 37 ounces.

Large ALCM AG-86A Cruise Missile rocket boosted RC glider (1 min 33 sec)


...Continue Reading
Posted by burkefj | Oct 19, 2012 @ 12:56 AM | 10,124 Views
Below are almost all of the scratch builds I've done. Rocket boosted at the top and pusher parkjets below. If there is something here that you really are interested in, let me know and I'll see if I can get you a pdf of the plans/templates if I made them.

Here are some results of how the models flew, out of 64 built, just a few failures, and a few that had initial flight problems but were solved...If there are no notes, they flew fine off the board.

Avro Arrow
X-15: 5 versions, aileron/tail, taileron only, Full fuse, Delta configuration. 72" 29mm version
Small F-106
Large F-106
F-100
F-101
F-102
F-104
F-105 Small and larger
F-107 Ultra Sabre
XF-92 Dart
F-4 Phantom
Bomarc: 4 versions, A model, B model, 29mm 72" B model, 68" A model for G-12's
Bomarc A: with ramjet tractor motors, too heavy for 24mm motor, motor thrust was marginal on tractors, wind blew pad over on last test flight and destroyed model
XF-91 thunderceptor: Used 18mm and 24mm airstart plus pusher, worked great.
Space Shuttle
Buran
Saab Draken: flew great, rolled like a drill, killed when a spektrum lockout occured when pointed straight down...
InteR/Ceptor(3 versions, two smaller 24mm and one 72" 32mm version)
Jayhawk(2 versions, 24mm and 72" 29mm version)
Mach 10
Mach 10(upscale): Suffered wing flutter and destruction on test flight
Goblin
Flapjack: Used differential throttle for yaw control, flew great
A-4B(2 versions)
B-58 Hustler
ME-163 Komet: Flew...Continue Reading
Posted by burkefj | Oct 07, 2012 @ 08:27 PM | 7,185 Views
I finally got around to upscaling my Jayhawk target drone 1.5x. 30" wingspan, 71" long. Used laminated 6mm sheets with staggered joints, and hs-65 mg servos with carbon reinforced wire pushrods to get the servo weight forward. I inset the nose weight into the nose section before gluing the pieces together so it is hidden. Just a single carbon tube for the wing spar, and some styrene sheet for reinforcing the bottom where landing scrapes would happen. The wingtips are slotted half way and plug into wing tabs. Turned out nice and stiff and the AUW is right at 35 ounces, same as the X-15 but with more wing area. Since this is an upscale of the original, the wing area is scaled proportionately, which means the wing is larger than scale, this is mainly to get the flight CG ahead of the lateral CG so I don't have lateral stability problems.

I like the C model because it isn't all red which allowed me to leave some of the depron unpainted to save weight, and it looks a bit different than all the others out there. Decals I made due with what I had and took some artistic license and used my sharpie for panel lines.


Right around 1000 sq inches of area.

I've found that the vinyl doesn't want to stick to the testors paint, so I had to use 3m-77 spray on them and then attach them, takes more time and you have to be more careful.

Maiden flight was great, I've settled on the Aerotech 29mm G-25 motor. It gives a nice boost, and is right on the speed edge where I...Continue Reading
Posted by burkefj | Oct 04, 2012 @ 03:03 PM | 8,164 Views
Some great pictures by Gary Goncher from the Fillible's Folly launch near Amity Oregon this last weekend. Included are my large X-15, bomarc, InteR/Ceptor, small V-1 buzzbomb and my level 2 cert flight on a performance rocketry 4" nike smoke and J-350 as well as the first flight of my Pershing 2 on an H-123 with separate nose/body chutes.

Also included are flights of the Nike Smoke on an I285 Redline, and my Pershing 1A on a G-75 metalstorm and Pershing 2 on an H-123 from the Rocketober launch in Brothers, Oregon....Continue Reading
Posted by burkefj | Oct 04, 2012 @ 01:35 PM | 8,196 Views
Wanted to post a bit about my rocket powered glider designs and things that I think about when building them.

On the surface, profile depron planes look simple, and a lot of people disparage them because they don't look real(in their eyes....) They are simple conceptually, but that takes some work to make them simple, strong and have good flight performance. In general cruciform designs will give the highest surface area and strongest structure for the weight. They have low frontal area and low drag. By using a cruciform type structure, you can get things to fly with extremely small wing area, but due to fuse lift, have very light loadings, very gentle flight and landing characteristics. I have done several full fuse designs, and they look great, however flight performance and weight is not as good as the profile designs, it all depends on what you are trying to achieve.

I like rockets that look like the original, ie motor in the tail, I'm not a pod and boom person, although that is the easiest way to combat CG shifts and get good flight performance.

I like to keep things simple, which means not having to move balast, centerline thrust, and minimal control surfaces. I normally run flat plate wings. The advantage of this is that you can boost perfectly straight up and not have any pitching moments, all you do is keep it straight if it strays due to wind, and then pitch over into glide. You don't need a special launch pad.

I like full flying tail designs. By...Continue Reading
Posted by burkefj | Oct 01, 2012 @ 04:28 PM | 2,916 Views
We had perfect weather this weekend in Oregon for our highpower launch near Amity and I took a literal Van load of rocket gliders....Pretty much everything shown here. Got in 16 flights over two days, some great flights with my Big X-15, InteR/Ceptor and Bomarc getting a flight in each day! I have to say the big gliders really look impressive and are really easy to fly.

That got me motivated to use the last of my store of depron sheet and servos/receiver, so I decided that the best candidate would be to upscale my Tomahawk cruise missile.

Advantages are, it is long, and not too wide, to keep weight down, double ply would be all that would be needed, with single ply wing with spar and KF airfoil by reinforcing the leading edge 25% with a doubler up to the spar. Two megal gear HS servos running the full flying tail and a 32mm motor mount.

Update 10/1: So far the AUW is looking like 24-25 oz which should fly on the Aerotech 32mm G-12 motor, but a single use G-38 weighs the same and would work if the model winds up heavier than 25 oz.

I have it framed up ready for sanding, 10.5 oz airframe with tail pivots, 4.5 oz motor, 1.5 oz servos, bec and rx, 1.5oz battery, and maybe 3 oz nose weight, an ounce for glue and styrene reinforcement plus launch button rail..22 oz plus any paint/trim...1.5x upscale so 60" long, 30" wingspan....Given the area, wing loading should be in the 6.5-7 oz per sq foot range.

Update 10/2: couldn't sleep so got up and applied the trim...Continue Reading