burkefj's blog View Details
Posted by burkefj | May 16, 2017 @ 10:48 AM | 2,843 Views
Quick update on Dynasoar rocketry, I've now sold out of my Wolverine and Interceptor III kits, but have plenty of stock of E-6 motors and 24mm motor casings and the Hypersonic III and Stratodart kits. www.dynasoarrocketry.com
Posted by burkefj | Jan 29, 2017 @ 11:24 AM | 4,285 Views
I've been thinking about this one for a while, but didn't think I could get something flyable with the small wing the Pegasus launch vehicle has, and with the weights of components. However my recent learnings with my Mace I thought I could get something done under 11 oz with maybe a passable look and glide.

So, I scaled the wing up of course, took a crack at boost CG and moved things around in openrocket and my rc cg programs and decided on placement of components. The wing sits on sort of a platform, so I faked that with some little extensions in front and rear of the wing, with some reinforcing gussets below. Idea was to look like pegasus but be light. There seems to be a number of tail shapes and configurations in the photos I've seen, I chose one with a horizontal stab so it would match what I'm doing for the controls. Most of the photos show the fins at 120 degrees to each other, but the ones flown off of the B-52 I found were at 90 degrees to the vertical stab. Wing area is right at 1 sq foot.

Came in right at 10.75 oz, first test flight was a tiny bit pitchy on boost, but glide was much better than expected. I added 5 grams to the nose and it was very stable on boost, with a very decent glide, landing speed is faster than my others due simply to the wing loading but the drag is fairly low.

Working with Stickershock23 to do the rest of the markings.

38" long, 22" wingspan, BT-80 lightweight tubing from bms.

Here are three flights from this...Continue Reading
Posted by burkefj | Jan 23, 2017 @ 08:29 PM | 3,744 Views
I've wanted to do an RC RG similar to a Mace Missile. The Mace used spoilers, not ailerons for roll and a high V t-tail for pitch. I was worried about stiffness and tail weight for a true T-tail, so wound up doing a mashup between the Mace wings, with alcm full flying surfaces and a stub T-tail to give it a mace-like look. I used black vinyl to simulate the engine intake on the bottom, as well as to shadow the tail to give a bit of a boat tail look when viewed from the side. Later Mace missiles had a dog-house or a shroud over the top rear to stiffen the tail so it wasn't a true boat tail anyway. I also built up a version with an ALCM engine intake on the top with the vertical tail, and moved the wing back an inch to remove the need for any nose weight. I haven't finished the alcm version, but the Mace came out at just under 12 ounces and flies very nicely. Diameter is 2.6" and length 38", wingspan 28.5" for both. The alcm version should be closer to 11.25 oz rtf due to the wing/CG movement.

RC Mace Missile rocket glider flight (1 min 24 sec)

Posted by burkefj | Jan 10, 2017 @ 12:06 AM | 4,800 Views
I've wanted to try doing a full fuse RC rocket glider Mig 21 ever since I built a profile version a few years ago. I settled on using the same vertical stab/wing/tail of the profile and use a 2.6" bt-80 lightweight tubing I had. I found a used nose cone I had and chopped off the nose and trimmed about 3" off of that keeping just the tip. I then glued in a piece of 6mm depron to block the rear of the nose cone and glued the tip onto that to give the characteristic mig 21 look. A 28" long tube seemed about right for the body and I decided on a sort 12mm sandwich profile for the canopy and spine to reduce drag instead of a full turtledeck.

I used a rocketry program called openrocket to build a mass model putting in the weights of the components including electronics, tubing, depron etc, with an estimate of my required boost CG and what nose weight might be needed. It looked like one ounce of nose weight would do the trick and keep me at 12 oz rtf using a 24mm E-6 rocket motor which will boost that weight to around 500'. Wing area at just over 1 sq foot is about half of my other rc rocket gliders so glide will be steeper, but not as steep as my bomarc which weighs closer to 14 ounces rtf with a similar wing and much more draggy design.

I decided to use the tab for the vertical stab that goes through the body tube to hold the motor mount in place, and to use full flying tail surfaces since that was very easy to do by putting a simple aluminum pivot tube...Continue Reading
Posted by burkefj | Dec 29, 2016 @ 10:20 AM | 4,349 Views
Had very nice weather on Christmas morning and so took out some of my newest planes for some flights, really a lot of fun.

Christmas Rocketplane flights (8 min 8 sec)

Posted by burkefj | Dec 19, 2016 @ 03:10 PM | 4,381 Views
The Jayhawk is a neat target drone, and one of my favorite rocket kits when I was a kid. It's rated at mach 4. The wing is pretty small, a 3.5' wingspan for a 14' long rocket, since at Mach 4 you don't need much.

I found some spare 2.6" lightweight tubing and nose cone I had and decided to make a Jayhawk like RC rocket glider. The 2.6" tubing is very light and the tubing+cone comes in at 4.25oz total. I combined that with one of my Hypersonic wing sets from the kits I make and played around with a stability program to ensure that my flight CG and the lateral stability with the wingtips would work out ok.

the wing is larger than scale to support flight, and I had to chop the lower part of the wingtips down a bit so that they wouldn't drag on the ground. I built a conduit section from laminated depron, mounted my rail guides and skids on that which helped raise it up off the ground some more.

Will use elevon control, 24mm E-6 long burn rocket motors.

painted rtf with motor is 11.25 oz

20" wingspan, 36" long, 2.6" diameter.
Posted by burkefj | Dec 08, 2016 @ 09:28 AM | 4,481 Views
Hi all, I've just completed test flights and instructions for the latest kit and probably the last new one I'll be able to produce for a while until I can find a good alternate foam replacement. I have enough parts for about 10-12 of these kits.

Instructions at: http://www.dynasoarrocketry.com/wolv...tructions.html

The Wolverine is based loosely on the old Estes Wolverine rocket, this has a heavy duty 3" tube body, through the body wing and tail and elevon control. 11 oz rtf for the venerable 24mm E-6RC rocket motor. Comes with tube already slotted, wing and tail spars installed and control surfaces hinged. 25" long, 32" wingspan. Stickershock did a great set of decals for me, I added just the tail and wingtip accents and the little black wing walk portions myself.

This design is similar to my Mach 2 kit, but by using a smaller tube, mid mounting the wing and removing the T-tail I was able to make the construction simpler and stronger and it will now fit it into my regular shipping boxes.

Construction is simple, unfold and glue the wing, install the small spar, insert the wing and glue in place. Glue the vertical stab in place, insert and glue in the pre-assembled motor mount and install the electronics and balance. As normal, rail buttons are included as standard unless you want a launch lug. Rail buttons are mounted slightly to the side so that they do not get caught on anything when belly landing.

Hope you all have a great holiday, it's been...Continue Reading
Posted by burkefj | Nov 22, 2016 @ 10:28 AM | 4,548 Views
I've finished and released my latest rc rocket glider kit, this is the simplest I can make construction and lightest weight given the components and still keeping a wing loading of around 6 oz/sq foot. The wings and tail are styled after the old Estes Dart but with a mid mounted wing. Maiden flights went really well with just about 3-4 clicks of down trim for boost and no added nose/tail weight needed. 11.25oz rtf with 23" wingspan and 38" length, comes with plastic nose cone with canopy/panel lines, pre-cut wing with spar slot cut and elevons installed, body tube slotted for the tail. Takes about 1.5 hours to assemble and install radio equipment.

Flight Video:

Dynasoar Rocketry StratoDart RC rocket glider Kit description and flight (2 min 16 sec)

I've done a complete built video along with a radio installation video:

Dynasoar Rocketry StratoDart RC rocket glider kit assembly (24 min 39 sec)
...Continue Reading
Posted by burkefj | Sep 12, 2016 @ 10:23 AM | 5,793 Views
I've been working on/thinking about this one for a while, I found a spare cosmic interceptor kit in my box that wasn't allocated to kits, and put this together. Based on an F-16, of course with a longer nose due to the interceptor cone. I went with a mid mounted wing and full flying tail only. I had to cut off one of the speed brake tabs on one side so that I could slide the wing in the slot, then glued it back in place, then slide the stabilators on and glued on the capture rings to hold them in place. Did some glide tests in the house before equipment install and took a swag at the boost CG. RTF weight came out right at 11.25 ounces before finishing. Did two test flights today in about 10mph winds, handled it really well, and I was able to move the CG back slightly.

I started using some vinyl to do the markings and so far she is coming out pretty nicely. I had to modify the thunderbird scheme slightly since I'm cutting this freehand and the nose being long, I did some nose and mid stripes so the middle wouldn't seem too plain. RTF now she is 11.75 oz. Just waiting for some small stars/bars and lettering.

F-16 Thunderbird RC Rocket Glider (4 min 9 sec)
...Continue Reading
Posted by burkefj | Aug 28, 2016 @ 02:27 PM | 5,796 Views
Here is another based on the Cosmic Interceptor but this time styled like a swept wing F-14 tomcat, in pseudo VF-111 Sundowner scheme but with early white control surfaces which helped set off the wing sweep/tail surface detail...

F-14 Tomcat RC Rocket Glider (5 min 46 sec)

Posted by burkefj | Aug 22, 2016 @ 06:01 PM | 5,585 Views
Thought it would be interesting to document all of the different RC Rocket gliders I've made from the Estes Cosmic Intercpetor rocket kit. It's a great platform at a closeout price, the nose cone is neat with molded in panel lines etc. All are 38-40" long, 20-26" wingspans, 11-12.5 oz rtf.

Here you go:

Three versions of Interceptors, wing with elevon controls, cranked delta elevon style, full flying tail style, F-104, F-105, A-12/SR-71, F-4 phantom wing/tail style, F-101, Delta Dart, Valkyrie, Avro Arrow, SST, Pegasus(fantasy), another Interceptor version with lighter weight, X-15-3 Delta Configuration, Arc-Light(fantasy), X-15-3 Delta mid mounted wing, F-14 tomcat....Continue Reading
Posted by burkefj | Aug 22, 2016 @ 03:12 PM | 5,583 Views
Here is another using the F-104 starfighter as the goal and using the Estes Cosmic Interceptor parts...flew really well, decided on a German Navy scheme....

U cut the tail of the body tube to give the right lines and to allow me to inset the rocket motor to help CG. I also moved the wing placement back an inch.

To keep the back end light and keep it simple I just did a light direct servo to the tail surface and routed the servo wire on the side, taped and painted over, instead of trying to do some internal linkage idea...

38" long, 2" diameter, 11.5 ounces ready to fly.

RC F-104 Starfighter rocket glider (5 min 13 sec)
...Continue Reading
Posted by burkefj | Aug 14, 2016 @ 01:37 PM | 5,469 Views
Here is another based on the Estes Cosmic Interceptor parts made into something resembling an F-105 thunderchief. I cut the rear of the body tube so mimick the petals of the speed brakes partly open. Full flying tail surfaces only for roll/pitch.


F-105 Thunderchief Rocket Glider flights (3 min 55 sec)

Posted by burkefj | Aug 09, 2016 @ 01:31 AM | 6,509 Views
Here is another rocket glider using the Interceptor nose cone and tubes, but made to look more like an F-101 voodoo. I went with a fixed stub T-tail just for looks and moved the wing back slightly so I could use oversized cutouts in the wing for elevons to keep the control setup simple and keep the weight low. I used pseudo operation sun-run markings with a little artistic license to make it look better(yellow on the tail).

38" long, 24" wingspan, 11 oz rtf....Continue Reading
Posted by burkefj | Aug 01, 2016 @ 09:19 PM | 6,467 Views
And Here's a version a-la delta dart......

Dynasoar Rocketry DeltaDart RC rocket glider kit (6 min 38 sec)

Posted by burkefj | Jul 28, 2016 @ 06:10 PM | 6,103 Views
I was thinking about his when I built the IronHand....concept was to flip the IronHand over(wing on top, intakes on the bottom) and make a new tail and voila, Arrow sort of....In reality I had to modify the wing shape for CG and appearance, and lengthen the intake plates, but it turned out fairly nice homage to the Arrow, and it was quite simple to make kittable.

Dynasoar Rocketry Arrow Rocket glider Kit flight (3 min 10 sec)

Posted by burkefj | Jul 27, 2016 @ 03:19 PM | 6,190 Views
From sketch to Flight test in 6 hours....

Yesterday afternoon, i found I had two spare servos, some extensions and a receiver laying around without a home, I also had two 2" estes white tubes and a coupler. I borrowed an interceptor cone from one of my other models and got to doodling. I basically grabbed an F-4 phantom wing and tail, with some side plates to mimick engine intakes. I used my template for the SST to trim the rear at an angle. Drew it up and did some initial CG calculations, moved the wing foward till the CG was right at the coupler joint since I knew my component/cone/motor weight usually averaged out at that point in the model. Drew it up on a napkin at 3:00. Got home at 5 and started cutting using some of the curved depron 6mm foam sheets I have sitting around, put some carbon in spots to help straighten/stiffen it.

For the wingtips I just cut a V groove and pulled them up and glued them in place after sanding the edges round.

Mounted the wing on the bottom of the tube, installed the tail and motor mount and did some indoor confirmation of the CG location. Installed electronics and had it ready to go by 9pm. Turned out I needed 1/4 ounce of tail weight, so I could have pushed the wing forward just a tad but it's pretty darn close to perfect.

Flew it this morning and it was great. Wing loading is similar to my deltas, boost needed just a hair of down trim, glide was spot on about 1/4" up trim. Really beautiful, nice thick smoke trail this morning with pure blue sky, glide took very little control input for turns, I came on approach at around 100 feet at the end of the runway and it just settled hands off till just before flare. Really nice. I was easily getting over 1 minute glide time in dead air.

I'm calling it IronHand.

38" long, 26" wingspan, 11.5 ounces ready to fly. 5.3 ounce/sq foot wing loading.

Dynasoar Rocketry IronHand RC rocket glider flight (2 min 8 sec)

Posted by burkefj | Jul 22, 2016 @ 11:36 AM | 6,573 Views
Here is another kit prototype rocket glider, using parts from a Cosmic Interceptor rocket kit, inspired by the XB-70 Valkyrie. I used some pre-molded panel lines in the cone to use my rotary cutter to cut slots for the canards, just to keep them straight, since they are lower than center on the nose cone, they angle down slightly but I like the look. Depron wing with turned down tips. Tail surfaces moved forward to clear the elevons. 38" long, 26" wingspan, 11 7/8 oz rtf. In keeping with the nordic theme but avoiding any copyright laws, I'm callign it the Valhalla.

Just a touch of downtrim was needed for vertical boost, glide was very nice with no bad tendencies. Waiting for decals to arrive to finish her up. Also is a video from last weekend in Kent, WA at the raceway with The BEMRC club flying all of my kits plus the bomarc prototype.

Dynasoar Rocketry Valhalla Kit flight (1 min 51 sec)

All Dynasoarrocketry Kits in action, plus a bomarc!! (7 min 57 sec)
...Continue Reading
Posted by burkefj | Jul 11, 2016 @ 10:14 PM | 7,018 Views
Here is a kit version of the tube based Interceptor I did, the Interceptor III, a 2" tube based rocket glider styled after the Estes Interceptor kit. 38" long, 24" wingspan, 12 oz rtf.

Dynasoar Rocketry Interceptor III RC Rocket Glider Flights (3 min 3 sec)

Posted by burkefj | Jun 13, 2016 @ 11:41 AM | 7,196 Views
I've been flying my full stack Titan II/DynaSoar for a while, had two flights this weekend.
It was extremely windy, 10mph constant with gusts to 17 or so.

Here is a combined video showing flight 8 first which was nominal and flight 7 afterward.

Flight 8 I pitched the model upwind and then held full up on the glider control to keep the nose up and slow the stack down till ejection of the glider.

Flight 7 is the second flight shown which I did not steer on the way up thinking it would weathervane into the wind, however it went slightly downwind, you can see how it did not eject at apogee and when I determined it was likely in a death dive, I tried to steer it level to minimize damage, it hung there for a second or two then finally ejected and nothing was damaged.

Highpower RC Titan II/Dynasoar flights on H-97 (1 min 3 sec)