burkefj's blog View Details
Posted by burkefj | Oct 18, 2011 @ 12:23 PM | 9,711 Views
For those of you that missed out on a hobbylab SR-71, or just thought it was too expensive or hard to fly, I decided to update my profile version, larger than the hobbylab version but for the same 24mm reloads.

I used up all my scrap depron last night, re-working my SR-71 profile for rocket boost. I pushed the motor mount as far forward as I could for CG reasons, without sacrificing the look, and I modified the elevons to be a bit thicker and took out the carbon reinforce and the decorative cuts that were to match the top view. I don't think it will impact the look at all.

It's very simple, only carbon needed is a single 1/8" longeron to give some support to the neck area, only difficult part is slicing the slots for the nacells at a slight angle, not hard, just need to do the same thing on both sides.

This version came in around 9.75 oz or so, about 50% less than the hobbylab version.

Here are the pieces and assembled test version. And then the final product, showing servo and rx/bec mounting and launch lug.

Test flight today, 10/22/2011 was perfect, about 3/16" of uptrim on the flap switch for glide, very nice easy slow landing and flare

Plans are here:

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

Frank
Posted by burkefj | Oct 12, 2011 @ 03:02 PM | 8,871 Views
I have one more piece of depron sitting here in a box, two more hs-55's and a bec, so that was obviously nagging at me to do something. I'm thinking I'm going to draw up a cruciform Tomahawk cruise missile tonight. I'll probably move the wings back slightly and trim the bottom fin so that it is level with the intake scoop so that on landing it won't be too nose down when it slides. I noticed the new block IV version only has 3 fins and no extended intake, I considered that one with the rear tail surfaces horizontal instead of bent down slightly but frankly it looked pretty boring.


Made good progress tonight, drew it up, sanded and fit the pieces, installed the tail pivots, landing reinforcement, and thin wing strip spars.

I did move the wing back a bit and gave a bit more chord, I cut the bottom ventral so that it the intake and the front of the nose all touch at the same time to distribute the landing load.

On this plane, I'm going to do the markings before I assemble it. Glide tests showed the CG a bit further forward than I guessed, due to the wide forward area.

AUW with some nose weight to counter the loaded motor is 9.5 oz rtf and 7.5 oz dry with no motor in the tail.


Test flight today was perfect, glide trim on flap switch of about 3/16" was right on, nice glide given the small wings.

http://www.youtube.com/watch?v=e2QGifqqChA

Plans at:

www.dynasoarrocketry.com go to the "home" tab and plans pulldown.

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Posted by burkefj | Sep 23, 2011 @ 09:53 AM | 13,355 Views
My V-2 that I built 17 years ago is now home again. My friend I traded it to asked if I wanted it back, and I said yes. Had to cut the body tube in half to get it back in a roll bag on the plane, and took two trips but got it back. Sat in the closet for a year, till my buddy reminded me about the local launch. Normally I miss that launch due to being in Reno for the air races, but this year it was a week after. So, installed a coupler, reinforced the joint, added rail buttons, and re-painted the camo to repair the damage 17 years will cause.

It's ready to go with my mountainside 2.6" version and my helmet. This rocket made the cover of HPR at one time.


Here is a link to the second flight liftoff photos.

https://www.rcgroups.com/forums/show...&postcount=134


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Posted by burkefj | Jun 05, 2009 @ 12:30 AM | 17,118 Views
Well, haven't been doing any flying or building, it's the height of competetive shooting season, been doing lots of that, went down to the evergreen aviation museum to see the new firearms exhibit they opened, the son of the owner has a very extensive collection of full auto lmg's, and a lot of other neat things, anyway, snapped a few photos of some planes, so thought I'd share them, and some rockets. They have added quite a few new things in the space center, and they had one of my favorites, a delta dart now outside next to the dagger, that was a nice surprise, as well as hanging up the X-15 mockup.

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Posted by burkefj | Mar 11, 2009 @ 01:07 PM | 9,708 Views
Here is the latest, fresh off the drawing board, an X-2. 39" length, 33" wingspan, 7 ounces dry, ~13 rtf with electric, or slightly less with rocket.

Frank
Posted by burkefj | Feb 10, 2009 @ 01:21 PM | 16,743 Views
I've been working on an upscale Mach10 boost glider that Centuri made, I used a cruciform foam fuse and slid the body tube over it, my thrustline is right up the center and the wings are in the center, instead of the offset thrustline, canted upper fin and low wings of the original, but it keeps the look pretty well.

Flew great, glide wasn't really long, but it was very docile. Fuse was flow-through to reduce drag and I didn't need to drop any balast, I kept the top fin level with the wing and just used reflex to keep the nose up during glide.

Frank
Posted by burkefj | Dec 24, 2008 @ 04:33 PM | 4,902 Views
Here are some more....I've still got a a Lockheed Cheyenne heli, a bomarc and ajax missile to put together someday...

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Posted by burkefj | Dec 24, 2008 @ 04:24 PM | 4,905 Views
Somebody asked me to post some photos of my plastic models, most of them were planes I really liked when I was a kid, and a lot of them I made flying profiles of....enjoy....

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Posted by burkefj | Dec 12, 2008 @ 06:17 PM | 5,506 Views
Found some equipment sitting idle since my xmas spad won't be in in time, so did another 50's plane I've always liked, kind of dorky, but let to the dagger and delta dart....

Got things drawn, cut out and dry fit, should finish tonight or tomorrow, but stormy weather this weekend.....

This is one of my simplest, four pieces, 35" long, 25" wingspan, one piece of carbon for the wing spar, only extra carbon needed is if you want the optional pitot probe. AUW dry with purple peril is 6 oz, with speed control, receiver, two servos, and a 1320 pack should be near 11 oz, pretty light.


Frank
Posted by burkefj | Nov 21, 2008 @ 11:54 AM | 5,220 Views
Here's my latest. After converting my X-15 to take 24mm D/E motors, or electric, I started on my latest, an XF-91 Thunderceptor, with pusher electric lsspj AND an 18mm C pod on the upper, and 24mm on the lower, so I can fly on single D, single C, dual C, etc. CG shift makes using both the D and C probably not realistic. First flights today were great, both single rocket while flying on electric pusher, AND a dual C flight air start. Really docile and a gentle pitch up under boost, really cool.

Frank
Posted by burkefj | Mar 12, 2008 @ 02:24 AM | 7,869 Views
Well, I just couldn't bring myself to put the "round" GAD starfighter that I got for xmas together, since I wanted something a bit bigger, so some more drawing and cutting....

Boy is that wing small, still should be around 1.6 sq feet, 55 inches long, and the wing is pretty far back. I'm hoping that I can get by with a 1320 pack for CG, and keep the weight around 15-16 oz. We'll see.

I'm using a carbon tube down the middle, a spliced center fuse/tail section, two spliced body doublers for the fuse outline, and two intake doublers to simulate the intake, will run a full flying T-tail. Same old Grayson parkjet for power that works so well.

Frank
Posted by burkefj | Mar 15, 2007 @ 01:09 PM | 8,682 Views
Just finished my Alpha F-86, Instead of getting the clear plastic covers for the inlet, I decided to try using gorilla glue to fill the front of the fuselage inlet to stiffen it. It worked quite well, however being the first time I used it, I used too much and had to scrape as it expanded, I did wind up having to trim about 1/8" of the front of the fuse foam to allow it to seat back all the way into the plane, but it is pretty stiff now I did use a roll of Photo paper with some silver mylar around it to extend the std duct to exit the rear of the
plane and smooth the exit a bit.

I've set it up with the mp jet motor, and TP1320 pack, AUW is 15.9 oz.

We'll see if it flies as well as my Mig.

Frank
Posted by burkefj | Mar 12, 2007 @ 06:50 PM | 7,235 Views
My GWS ME-262, non scale paint, but influenced highly by my
LOC V-2 flying on a K-550