Not the best rendition of a lander, certainly, and I think this could use lots of extra detailing, but here's my simple lander craft for SEMROC Series-20 tubes. Note that the nose cone shown here is not an exact size match to any of Carl's NCs, so just match up the next nearest elliptical and change the length figure in the file. The final numbers should be close.

The legs are made up from spruce dowels, 3/16" diameter, and balsa sheet stock, also 3/16" thick. Without getting more complicated, I drew the legs as a single piece.

Length: 17.49"
Diameter: 2.04" (Large Series 20)
Fin Span (legs): 8.9"
Weight: 2.79 oz

C6-3......410'......Dv 9-11 FPS......48" rod 3/16" dia

Enjoy!

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Titan Lander.rkt (111.0 KB, 108 views)

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SAM 0044
AMA 352635

Nice design on the Titan Lander Craig. The lander seem to be decending about 9 MPH which for a nice gentle landing. This one will go on my build pile.

Lately I have been freaking RocKsim out again with an experimantal flat fin idea. I don't know if rocksim is calculation for the fins on the flat of not. The mass seems to be a bit heavy also. For the flat fins I have simply reversed the figures. On the plan points screen I make the 1/16" tall and on the thickness data I enter 4 or so inches. I definetly need another opinion on this flat fin business though.

Thanks Again and Enjoy, JP

James Pierson
NAR# 77907

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Lollipop.rkt (54.0 KB, 104 views)

I've been doing this on a few of my designs, usually for things like canopies and cowlings. However, for an extreme example of this idea in-action, go look at my "Eugene's Axe" plan...

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Thought I would try a hand at a vintage target drone that I found on the net. I just gave the photo my (Carpenter) " good eye" look at it and guessed it from there, hence the words Semi-Scale.

Here is some info about this bird:

Data for PQM-56A:

Length 9.78 m (32 ft 1 in)
Wingspan 3.66 m (12 ft)
Diameter 51 cm (20 in)
Height 2.18 m (7 ft 2 in)
Weight (w/o booster) 1300 kg (2860 lb); booster: 1250 kg (2760 lb)
Speed Mach 3.1
Ceiling 20000 m (65000 ft)
Endurance 14 min.
Propulsion Booster: 2x solid-fueled rocket motor
Sustainer: 2x Type 625 ramjet (76 cm (30 in) diameter)

In 1957, Nord Aviation in France began the development of the CT.41 supersonic aerial target, which was ready for production in mid-1959. The CT.41 was powered by twin ramjets, boosted to Mach 1.7 ramjet ignition speed by two solid-fuel rocket motors, and recovered after the mission by parachute. It could reach a speed of about Mach 3, and was controlled by a two-way radio-command link and an onboard autopilot. To simulate a bomber aircraft, the CT.41 could be fitted with various simulation equipment, like multi-band radar transponders and infrared flares. A total of 62 CT.41 vehicles were built in France.

In the United States, Bell acquired license-production rights on the CT.41, after the U.S. Navy had expressed interest in the target. Bell-built CT.41s were used by the Navy for a relatively short time during the 1960s, and in June 1963, the targets were designated as PQM-56A. By the early 1970s, the CT.41 was no longer operational with the U.S. Navy.

Thanks and Enjoy, JP
James Pierson
NAR# 77907

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PQM-56a Arial Target.rkt (58.3 KB, 111 views)

Neat, James! And it qualifies as a "Schoolyard Sounder", too.

I like it when a scale subject lends itself to a model as well as this one.

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I thought someone (Phred?) had already come up with this plan, but the Excelsior site didn't have a decal-plan set for it. If anyone can remember seeing this idea earlier, point me in that direction...

So, here's a new Goony that twice reaches back to the past -- the Goon Ranger!

(Phred, the best decal image would be your "smiley face" with a mask...)

For technical specs, this is a three-motor 13mm cluster. It uses the 7.5" tube, cut into a 4" piece and a 3.5" piece, and it retains the stock fins and nose cone. You will need to add the centering rings and a bulkhead, the motor tubes and engine blocks, and a 1/8th oz fishing sinker.

Length: 13.25"
Weight: 1.75 oz

(3) 1/4A3-3T.......93'......24 FPS......36" rod 1/8" dia
(3) 1/2A3-4T......256'......15 FPS......36" rod 1/8" dia
(3) A3-4T.........588'......24 FPS......36" rod 1/8" dia

Enjoy, chemo-wasabi!

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Goon Ranger.rkt (68.0 KB, 113 views)

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Another from the "Ain't This Already Been Done?" category...

Presenting... The Goony Cobra. Taking the clustered 13mm idea to another extreme, I figured the Cobra deserved an appropriate send-up. I got a pleasant surprise when I ran the simulations, too.

Length: 12.75"
Weight: 1.25 oz

(3) 1/4A3-3T......141'......Dv 9 FPS......36" rod 1/8" dia
(1) A10-3T........239'......Dv 3 FPS......36" rod 1/8" dia
(3) 1/2A3-4T......346'......Dv 2 FPS......36" rod 1/8" dia

Notice the single A10-3T entry. Obviously this would require a different motor mount to function correctly, but you can still get an idea of the power that A10 has. Not a motor to be underestimated...

Do not use either the A3-4T or the A10-3T in a cluster for this model. The Dv range is extremely high (over 35 FPS) for both clusters.

Enjoy!

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Goony Cobra.rkt (73.1 KB, 124 views)

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Nice job on the Goonies Craig. I have a couple of questions for you about school yard sounders. What are the qualifications for a rocket to be considered a school yard sounder? Also what is the minimum altitude that a rocket should attain before ejection? About 100' ??

Here is a new design I call the Arrow Head. Its more of a modern broad point tip style than an native indian arrow head. Looks like I really need to make a Semroc order and get some of Carl's cardstock. After e-mailind Carl I need to break my old habits of estes tube and centering ring ## and memorize the Centuri ##. Very Very confusing??

Thanks Again and Enjoy, JP
James Pierson
NAR# 77907

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Arrow Head.rkt (46.1 KB, 103 views)

It's the idea of using 13mm motors instead of larger motors; and as for altitude, well, it's more like trying to get the best performance for any given design, which in this case would also require very low Dv numbers. Remember also that most schoolyards are small at best, so you're trying to keep the rocket safely in that small field. This might require a larger model than you otherwise might design for a small motor. That Goony Cobra is a good example: It's still a BT-60/BT-50 model, but it gets over 230' on an "A" class motor. Other than that, I'm not terribly picky...

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Well, this design I can that I am pretty sure that it is an original. At least I think it is. In fact the more I played with this design the higher I moved it up on my build pile, all the way to the top. Yep, I have definety found my next build.

I would also like to apoloize for the name in advance. I was watching a show on the Science Channel about "String Cheese Theory" and other Cosmic mis-givings. I personally consider all these theory's "POO", therefore I give you all this design called Cosmic Poo.


Thanks Again and Enjoy, JP

James Pierson
NAR# 77907

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Cosmic Poo.rkt (51.7 KB, 103 views)