o1d_dude
'I battle gravity'
As of this post, Estes still has A10-0T in stock.
An early deploy would seem to be less likely to cause a lawn dart.
Estes C5-3 motors available
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An early deploy would seem to be less likely to cause a lawn dart.
But is the A10-0T ejection enough to burn through the thin string that holds the blades in place? The Estes site only recommends A10-3T.
The main problem is that I need to add a frak ton of weight in the NC for the Heli to fly straight up. This tends to make it keel over at apogee so any delay is bad.
I'd look to other solutions for your HD problem. However, the A10-0t can definitely burn through a string to release a recovery system.
Unless you "improve" the Mini-A Heli by making it heavier, it works fine on A10-3Ts. If you piston-launch it, it even works well on 1/2A3-2Ts.
Often items "out of stock" will return in a day or two. As has been noted elsewhere, that's out of stock at the corner of one warehouse where the mail-order fulfillment is done, not out of stock in Penrose. That said, I see AC Supply is also out of C5-3s....so maybe they do need to make more.
Often items "out of stock" will return in a day or two. As has been noted elsewhere, that's out of stock at the corner of one warehouse where the mail-order fulfillment is done, not out of stock in Penrose. That said, I see AC Supply is also out of C5-3s....so maybe they do need to make more.
kidagain
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FYI I just ordered 3 packs of C5-3's from Rocketry Works.
https://www.rocketryworks.com/C5-3-18mm-motor/
https://www.rocketryworks.com/C5-3-18mm-motor/
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FYI, SiriusRocketry also presently has them in stock:
https://www.siriusrocketry.biz/ishop/estes-c5-3-super-c-rocket-engines-2005.html
kidagain
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Good Price to
o1d_dude
'I battle gravity'
Just ordered C5-3’s and A10-3T’s from Rocketry Works as well
The downside is that Estes is now out of stock on the A-Heli!
Should have ordered the kit last night...
woulda-coulda-shoulda
The downside is that Estes is now out of stock on the A-Heli!
Should have ordered the kit last night...
woulda-coulda-shoulda
I realized I had more comparisons with the Estes Centuri and Nike Smoke. Both rockets need a longer delay so it can weathercock into the wind and return to the launch site. They definitely flew straighter with the C5-3 and traveled further because of the shorter delay. Overall, I don't think I'll bother using the C5-3 with these rockets and stick with the C6-5.
Timeline:
00:03 Centuri with C6-3
00:43 Centuri with C5-3
01:29 Nike Smoke with C6-5
02:20 Nike Smoke with C5-3
Timeline:
00:03 Centuri with C6-3
00:43 Centuri with C5-3
01:29 Nike Smoke with C6-5
02:20 Nike Smoke with C5-3
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o1d_dude
'I battle gravity'
So I found the Mini A Heli kit on sale at HobbyLinc and put in my order for two of them.
Cost me a buck and a half more than Estes in total.
o1d_dude
'I battle gravity'
Ordered the A10-3’s from Rocket Works out of Tucson. Very good vendor with quick shipping. RecommendedSo how are you gonna put in a C5-3 into the Heli?
arconhi
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I bought some from Estes recently. Have not flown with them yet.Got this e-mail from Estes, as many of you are probably receiving now:
Not yet available from AC Supply. I think I still have a few "Super C" motors when they were produced by Centuri.
I’m hoarding 5 packs now but can’t use them until the parks reopen after the 9th, supposedly. The winds should be <10mph this weekend.
arconhi
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Do they work good for heavier rockets?
They are designed to get heavier rockets off the pad faster, improving their stability and reducing weathercocking.
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Oh yeah!
Per Estes site
For C6 motors, max recommended lift off weight is 113 grams
For C5, 227 grams.
Interestingly, Quest D16 maximum recommended liftoff weight is 128 grams, which seems low to me.
Here is my source, the Quest site
https://www.questaerospace.com/2-Pack_D16-4_Q-Jet_Model_Rocket_Motor/p4193205_18980165.aspx
Here is the RocketReviews side by side comparison
https://www.rocketreviews.com/compare-motors---estes-c5-to-quest-d16-q-jet.html
https://www.rocketreviews.com/compare-motors---estes-c6-to-quest-d16-q-jet.html
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https://www.rocketreviews.com/compare-estes-c6-to-estes-c5.html
Something I don’t get on the data here, maybe @jadebox or another of many forum members smarter than me can explain.
How come the C6 is rated as 76%C and C5 only 56%C?
How can the C5 have equal propellant (actually slightly more) and lower total impulse?
To me, the area under the curve for the C5 appears to be AT LEAST as much as the C6, and it eyeballs slightly more.
Why is the C5 lighter (larger nozzle bore means less clay,bigger hole?)
Something I don’t get on the data here, maybe @jadebox or another of many forum members smarter than me can explain.
How come the C6 is rated as 76%C and C5 only 56%C?
How can the C5 have equal propellant (actually slightly more) and lower total impulse?
To me, the area under the curve for the C5 appears to be AT LEAST as much as the C6, and it eyeballs slightly more.
Why is the C5 lighter (larger nozzle bore means less clay,bigger hole?)
Nytrunner
Pop lugs, not drugs
Modern BP propellant blend is less potent? C6 hasn't been certed in awhile?
arconhi
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Thank you for the info. Did the C5 replace the old 18mm B14 motors from Estes?
arconhi
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Makes sense..Thank you for the info on the C5. Did the C5 replace the old Estes B14 motor from years ago?
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arconhi
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I agree what you said on the D16. For a D motor it should be more thrust. Thank you for taking the time for the Motor comparison charts.
Rocketjunkie
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The reason is the delay. Quest D16's are only 12 N-s and the delay is longer so a heavier rocket will need a shorter delay than 4 seconds. Also, Estes seconds are shorter than Aerotech seconds. (Where is the duck smiley?)
Rocketjunkie
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The C5 has a deeper core for more initial thrust. This also results in a larger nozzle throat. Due to the larger nozzle, the rest of the propellant burns at a lower pressure and loses some specific impulse. That's why the total impulse is lower even with the same amount of propellant. It also results in a longer, lower thrust burn.
arconhi
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That is well before my time, so I have no idea.
The B14 looks more like a flash bang.
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If I understand you correctly, you are saying that the C5 nozzle is less efficient (not knocking you or arguing, I think that makes sense but I was a biology major not an engineering major, so I don’t have the savvy to figure it out myself.). I also understand (I think) that in some cases “less efficient” doesn’t mean “not as good”, in this case it may be less efficient in total impulse but still better for certain applications (like getting big draggy rockets off the pad.). Still, when I look at the the thrust curves, the C5 spike is significantly higher AND slightly longer lasting, and whatever you call the flat part of the curve (“plateau”?) is minimally lower in thrust and the C5 burn is slightly longer. So I am still at a loss, I thought the total impulse was basically the area under the curve. Eyeballing it the C5 looks higher. Also, C5 at 7.79 Ns and C6 at 8.82 gives a ratio of 0.88, while for “Motor Class” C5 at 56% C vs C6 at 76% C gives a ratio of 0.73. So my ignorance is showing again......
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