Search found 37 matches

by MJD
Fri Jan 12, 2007 4:39 pm
Forum: Valved pulsejet forum
Topic: Nozzle
Replies: 9
Views: 5404

Re: Fuel Nozzle

Danfoss makes a nice range of Oilburner nozzles.... //Fredrik Thanks, found a local store that got these. Got anye idea what the GPH should be(i have no idea...)? And how expensive it is? Just remember that GPH rating is based on oil burner pump pressure, which around here is 100psi. Adjust for you...
by MJD
Fri Dec 15, 2006 7:45 pm
Forum: Valved pulsejet forum
Topic: RC V-1
Replies: 11
Views: 7012

Re: re: RC V-1

The problem is the V1 is a cruise missle. Cruise missiles arent made for sharp turns, or manuvers that you would need a RC plane to do. The wings and all control surfaces will have to be very much larger, or it will literally fall out of the sky. Eric Nope. The V-1 has sufficient wing area in scale...
by MJD
Tue Nov 07, 2006 6:02 pm
Forum: Off topic forum
Topic: DANGER epoxy fire!!
Replies: 5
Views: 5861

Re: DANGER epoxy fire!!

My buddy decided to fix his windsurfing gear, I usually do the glasswork but he wanted to this time. I use general purpose grade epoxy from tap plastics, 1 to 1 ratio. He used marine grade 4 to 1 ratio (1 part hardener to 4 parts epoxy) but since I taught him to do repairs and had only used my epox...
by MJD
Wed Oct 25, 2006 5:10 pm
Forum: Valved pulsejet forum
Topic: My plane is almost ready!!
Replies: 24
Views: 14345

Re: re: My plane is almost ready!!

I've done some shopping around and the only fuel pumps i can find run off 12V most only 30psi. Its not a major issue, though 8.4 V or so would be much easier with my current battery arrangement. Perhaps you could tell me the brand of your fuel pump, and I assume your running it off a normal 50amp o...
by MJD
Thu Oct 12, 2006 6:40 pm
Forum: Valved pulsejet forum
Topic: My plane is almost ready!!
Replies: 24
Views: 14345

My plane is almost ready!!

You could see a video of my engine running and some test on the throttle response!! at this link http://www.truerc.net section Canada Wow, that's great. I live next door in Ontario - I'll take one! I have a Dynajet and Doylejet (Dynajet clone in size) and have been dying to build a jet for a while ...
by MJD
Wed Aug 02, 2006 7:08 pm
Forum: Rocket forum
Topic: longest burning rocket propellant
Replies: 4
Views: 6457

Re: re: longest burning rocket propellant

I am looking for about 75 newtons of impulse. I can't use the Rocsim because I am using Linux and I have removed DOS. In a 2" motor this can easily be achieved using a fairly fast burning composite propellent in an end burning configuration, but if you are new to motor making you have quite a ways ...
by MJD
Wed Aug 02, 2006 7:01 pm
Forum: Rocket forum
Topic: anyone have info on Nozzle-Less rockets?
Replies: 36
Views: 25819

Re: re: anyone have info on Nozzle-Less rockets?

The meteor (or one of the rockets made by the same company) uses a nozzle-less rocket which turns into a ramjet. http://www.bayernchemie-protac.com/meteor.htm I guess its not the meteor, but I'll leave that up just because. Okay, these I know about. Boosted to flight velocity by a nozzle less rocke...
by MJD
Wed Aug 02, 2006 6:54 pm
Forum: Valved pulsejet forum
Topic: 1944 V1 rocket launch procedure
Replies: 20
Views: 12520

Re: 1944 V1 rocket launch procedure

Hi, I may be in the wrong space, so I ask yuor patience and aid in pointing me in the right direction. I am researching a movie script I am working on and need to find out what the launch procedures are for the V1 rockets that lit up London in WW2. Did the launch require any type of safety mechanis...
by MJD
Mon Jul 10, 2006 9:10 pm
Forum: Rocket forum
Topic: anyone have info on Nozzle-Less rockets?
Replies: 36
Views: 25819

Re: re: anyone have info on Nozzle-Less rockets?

Sugar rocket fuel burns very slowly int he absence of pressure, but once it gets up to pressure it burns like crazy! Composite fuel "chuffing" is when the fuel and nozzle are mismatched so that the correct pressure is not achieved, the fuel chokes itself out/down. I have found much info on nozzlele...
by MJD
Mon Feb 13, 2006 10:35 pm
Forum: Valved pulsejet forum
Topic: 1970's or 1980/1981 DynaJet
Replies: 10
Views: 5194

re: 1970's or 1980/1981 DynaJet

There are small high-tension units available from companies that sell the neon running lights for cars. I have one called "the Boss" from West Coast something-or-other that uses 12 VDC input and provides 7500V output. Will fire across a small spark gap. What I don't know is the duty cycle it will to...
by MJD
Mon Feb 13, 2006 6:09 pm
Forum: Rocket forum
Topic: Level 1 cert. attempt
Replies: 11
Views: 7880

re: Level 1 cert. attempt

Motors up to 62.5 grams of propellant (mid-G total impulse level) are model rocket motors and loosely regulated. Larger than that are HPR motors and more tightly controlled. The two associations that oversee high power rocketry (HPR) in the US and that offer certification programs are the National A...
by MJD
Wed Feb 08, 2006 8:16 pm
Forum: Rocket forum
Topic: help in designing a rocket
Replies: 20
Views: 12506

re: help in designing a rocket

The rules of model and high power rocketry are that reloadable motor cases are made of 6061-T6 aluminum, the rationale being that the ductility of the alloy pretty much prevents fragmentation. The additional rule is that the motor be designed to fail longitudinally - that can be done by ensuring tha...
by MJD
Mon Feb 06, 2006 7:36 pm
Forum: Rocket forum
Topic: help in designing a rocket
Replies: 20
Views: 12506

re: help in designing a rocket

If you get a rcandy 3/4" copper tube cased motor to go 1500 feet I will be totally amazed, esp. considering the descriptions of some of your other experiments. Copper isn't heavy? Copper has a specific gravity of 8.96! Al is only 2.7. Also, and I say this from experience not hearsay, just because so...
by MJD
Tue Jan 31, 2006 2:51 pm
Forum: Rocket forum
Topic: tiny rockets
Replies: 3
Views: 3624

re: tiny rockets

Yeah, I know they are commercial, I was quoting that as a goal of sorts.
by MJD
Tue Jan 31, 2006 2:50 pm
Forum: Rocket forum
Topic: Thermite Rocket?
Replies: 12
Views: 18354

re: Thermite Rocket?

Considering that the thermite reaction consists of metalA reacting with metalB oxide to produce metalA oxide and molten metal B, thermite is probably the most useless candidate for a rocket fuel of any commonly known pyrotechnic mixture. It produces hot solids and or liquids. Rocket propellants need...