#1
|
||||
|
||||
Question about delay times for RMS reloads
I'm seeking a little bit of clarity on RMS reloads if I may impose on you fine folks for a minute.
This how I understand things and please correct me if I'm wrong. Let me post the specs of a motor if I may and take it from there. Specifications: Reload Designation: F12-5J Hardware Designation: RMS-24/40 Outer Diameter: .938" (24mm) Length: 2.75" (70mm) Loaded Motor Weight: 67 g Propellant Weight: 30.0 g Propellant Type: Black Jack™ (J) Total Impulse: 43 N-sec (max) Burn Time: 3.6 seconds Delay Time: 5 seconds Maximum Recommended Liftoff Weight: 15 oz/425 g Fits: Rockets designed for black powder `D` motors For it to be a 24mm reload this motor is pretty powerful. 43Ns not too shabby. Now the way I understand it is, the delay and the propellant are ignited at moment of ignition and liftoff. Correct? If that is so, with a 3.6 sec. burn time and a 5 sec. delay, then recovery deployment should happen approx 1.4 sec. after motor burn out. Is that the correct way to look at this? If it is, then why do some websites, like Hobbylinc don't list burn time for their reloads? How am I suppose to choose the correct delay? Say a I want a 3 sec coast after burnout. How would I choose the correct motor for the desired effect? I'm just asking. Obviously some websites, hobbylinc is not the only one, expects me to do my homework before I go shopping. Fair enough. Where might I go to discover, uncover, educate myself on these new reloads for the smaller motors. I would love to know what I'm looking for before I shop, and at least learn while I shop. All the data is important but really what is most important to me when shopping is Reload designation, Max lift off weight, propellant weight, total impulse, delay time, and burn time. Some of the specs on the motors don't really jive with what I would expect on sites like hobbylinc for instance. These specs are for an E28-7T The average thrust of the motor is 6.3 pounds (28 Newtons). Time delay of 7 seconds between propellant burnout and the firing of the ejection charge. Uses the exclusive Copperhead single lead igniter. Motor Diameter: 0.94" (24mm) Assembled Weight: 1.9oz (54g) Maximum Liftoff Weight: 10.6oz (301g) Total Impulse: 40 Newtons Aerotech Product Number: 52807 And then these specs are listed for an F24-4W Impulse energy- F-class Average thrust in Newtons- 24N (5.4 lbs) Delay in seconds between propellant burn-out and activiation of the ejection charge- 4 seconds Propellant type- White Lightning For use in- RMS 24 Motors Primary use- Single Stage Motor diameter- .94" 24 mm Assembled weight- 2.2 oz. 62 g Maximium liftoff weight- 9.5 oz. 269 g Aerotech Product Number: 62404 That is very confusing to me. An F class motor has less thrust than an E class motor? Am I looking at this totally wrong or something? Thanks in advance for the help. David
__________________
I used to have super powers, but then one day, my Therapist took them away from me. NAR #96285 SoAR #503 My Low Power Rocket Fleet Level 1 (2-22-2014) GRITS Winternationals Level 2 TBD Level 3 TBD |
Thread Tools | Search this Thread |
Display Modes | |
|
|