Hello All,

While the following isn't directly connected with model rocketry, I figured that many of the folks here might also find it interesting (many YORF members are also model airplane enthusiasts). Also, it *could* be directly connected with model rocketry. While the NAR (and possibly also the A.M.A.) don't approve of firing model rockets from model airplanes, a safety feature that advancing technology makes possible (namely, a "tilt detector/lock-out system" that would prevent motor ignition if the launching aircraft was nose-up at more than 30 degrees from the local vertical) might possibly persuade them to change their position regarding air-launching. Here is what I found:

While watching YouTube videos of EDF (Electric Ducted Fan) R/C (Radio-Control) jet models last night, I came across other videos of a type of R/C jet model that I never knew existed—*indoor* EDF jets! Below I have included several links to information on these models (including photographs and videos). Many indoor R/C jet models can be flown outdoors as well as indoors, even in breezy conditions. The tiny EDF units that power these models are as small as 25 mm (~1”) in diameter, and they are also suitable for F/F (Free-Flight) jet models; indeed, most of the indoor R/C jets would probably also make good F/F models. (“R/C-assisted F/F”—a hybrid system in which occasional R/C directional control inputs, usually rudder-only, are used to ensure that a F/F model doesn’t wander off its flying field—would also be well-suited to many indoor/outdoor EDF jet models.) Also:

Sams Models offers a 26 mm diameter EDF for F/F jets (see: http://www.samsmodels.com/site/ , about halfway down the “screen-page”). Below are links to material on other micro EDF jets, including kits and plans:

Micromodeldrome http://micromodeldrome.com/

Micromodeldrome YouTube channel https://www.youtube.com/channel/UCr...7Nl5PfzqSy0DLkw

Indoor EDF jet model with 1” fan https://www.youtube.com/watch?v=1BsXU5H18YA

Douglas F-4D Skyray indoor EDF model https://www.youtube.com/watch?v=8yRydrNgeco

BAe T-45 Hawk micro EDF R/C model https://www.youtube.com/watch?v=nx1EwFlBwtY

Vought Corsair II micro EDF R/C model https://www.youtube.com/watch?v=XvUEg3SRt2k

Various indoor (and outdoor) EDF R/C model jets https://www.google.com/search?q=ind...NIQsAQISw&dpr=1

I hope this information will be helpful.

__________________
Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see:
http://www.lulu.com/content/paperba...an-form/8075185
http://www.lulu.com/product/cd/what...of-2%29/6122050
http://www.lulu.com/product/cd/what...of-2%29/6126511
All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com.
NAR #54895 SR

A quick story about the micro A-7 Corsair II Jet. In 2010 when I posted my A-7 rocket on another group, The OZ guy, nitrocharged posted about my rocket and 'his' jet. Another gent in south, FL accused the OZ guy of stealing is design(kinda, sorta true, he enlarged it), a written clash ensued to no resolution.

My rocket:

http://www.rcgroups.com/forums/show...et#post14601921

OZ Jet This post has the squabble!

http://www.rcgroups.com/forums/showthread.php?t=1241275

pmpjohn jet:

http://www.rcgroups.com/forums/showthread.php?t=1192753

__________________
If it flies, I can crash it!

They are semi/sport scale models....they both copied Vought. They are both R/C so they are going to be very similar due to simple physics and hardware availability. Took me 3 seconds to solve it.

__________________
I love sanding.

Why so long? It took me 1.5 seconds six years ago.

Must be the time lag!

__________________
If it flies, I can crash it!

Thus spake Ilvilon the Devoted, the Elder Unicorn who is called the Friend of Man: "Absent any sensible cause for disagreement or even conflict, humans will readily contrive to create their own, apparently enjoying being at odds with each other and exhibiting a perverse skill for creating this state of affairs." Ruminating on more cheerful matters:

A clone of the Centuri Mach 10 boost-glider (see: http://www.oldrocketplans.com/centu...A-4/cenKA-4.htm ) would make an interesting F/F or even R/C micro electric ducted fan (EDF) powered model. Such a model--perhaps slightly up-scaled, or fitted with a dorsal (or belly) "conduit" in order to accommodate a 25 mm ducted fan inside its fuselage, immediately below its motor mount tube--could fly in either EDF-only mode or "mixed-power" EDF *and* rocket mode. Also:

As long as the model's rocket motor was ignited in the usual way, with the Mach 10 set up on a normal launch pad and launched within 30 degrees of local vertical, running the EDF after rocket motor burnout (or even during the rocket-powered ascent, although the fan blades might stall at such airspeeds) would not contravene the NAR Safety Code. Scale models of the earlier Space Shuttle designs (which often had winged boosters, and usually had deployable turbofan engines on both the boosters and the orbiters) could utilize flip-out EDF units, which would power the models during their wing-supported descents (flying in F/F [with EDF motor run timers], R/C, or "R/C-assisted F/F" mode). For simplicity--and single-pilot operation--the winged boosters of such models might fly in F/F mode, while the orbiters would be flown actively via R/C (or semi-actively, by means of "R/C-assisted F/F"), with EDF motor run timers being used with the F/F flight mode.

__________________
Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see:
http://www.lulu.com/content/paperba...an-form/8075185
http://www.lulu.com/product/cd/what...of-2%29/6122050
http://www.lulu.com/product/cd/what...of-2%29/6126511
All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com.
NAR #54895 SR

I type slow.

__________________
I love sanding.

Rc mach 10's fly really well, I do an upscale kit for rcrg that can also take a pusher motor that clicks into the motor mount, flies really well, I call it a mach 2.

Frank

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RC Rocket glider kits
www.dynasoarrocketry.com

That's very good! Such "crossover" models are different and interesting, and they can get around temporary rocket flying restrictions (when foliage is tinder-dry, or if winds aloft are too high, they can be flown as wing-supported aircraft instead). They can also attract people from both hobbies, as many model aviators aren't into model rocketry (and vice-versa). The new ESA and Australian proposals for propeller-driven, winged reusable first stages also provide opportunities for creating Concept Scale (and maybe Scale, later on) rocket/electric propeller-driven F/F, R/C, or "R/C-assisted F/F" flying models of such vehicles. Plus:

"Crossover" models, such as your Mach 10/Mach 2, show how model rocket structural materials are also useful for R/C model airplanes. To give another example, many jet-powered target drones, cruise missiles, and reconnaissance/strike UAVs have simple cylindrical fuselages and ogive nose cones (the Tomahawk and Harpoon cruise missiles and the MQM-107 target drone are just three common examples of these aircraft). EDF (Electric Ducted Fan) powered F/F, R/C, and "R/C-assisted F/F" models of craft such as these could be built quite simply by utilizing kraft paper rocket body tubes and nose cones made of balsa wood (hollowed out if need be), blow-molded plastic, or vacu-formed or 3D printed plastic, along with sheet balsa or sheet foam (such as Depron) wings and tail surfaces.

__________________
Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see:
http://www.lulu.com/content/paperba...an-form/8075185
http://www.lulu.com/product/cd/what...of-2%29/6122050
http://www.lulu.com/product/cd/what...of-2%29/6126511
All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com.
NAR #54895 SR