What is dope (brand, etc.)? Briefly, how do you do the tissue covering?
Just give it a lot of rail/rod, d12 hits 30N peak at ~0.25s, e11 hits 19N peak at ~0.4s.
Been looking at other motor alternatives: what is your opinion on the Aerotech E18-4W (longer sustained peak thrust and 2.1 sec. burn time) and the Aerotech E15-4W (peak thrust happens almost immediately but at a lower max thrust, though not sustained as long as the E18, and has a shorter 1.6 sec burn duration)? I'm thinking the E18 would get it off the pad at a decent speed and maintain it longer for a straighter trajectory, and since it has a longer burn time than a D12 it might loft it to a safer height?
30.357 @ 0.134s, that's a kick in the pants! Sim it on all three of them, ballpark how it does.Been looking at other motor alternatives: what is your opinion on the Aerotech E18-4W (longer sustained peak thrust and 2.1 sec. burn time) and the Aerotech E15-4W (peak thrust happens almost immediately but at a lower max thrust, though not sustained as long as the E18, and has a shorter 1.6 sec burn duration)? I'm thinking the E18 would get it off the pad at a decent speed and maintain it longer for a straighter trajectory, and since it has a longer burn time than a D12 it might loft it to a safer height?
Wish I could. Don't have Rocksim, and Openrocket, which I do have, doesn't do glider sims (or I haven't figured out how if it does).30.357 @ 0.134s, that's a kick in the pants! Sim it on all three of them, ballpark how it does.
Been looking at other motor alternatives: what is your opinion on the Aerotech E18-4W (longer sustained peak thrust and 2.1 sec. burn time) and the Aerotech E15-4W (peak thrust happens almost immediately but at a lower max thrust, though not sustained as long as the E18, and has a shorter 1.6 sec burn duration)? I'm thinking the E18 would get it off the pad at a decent speed and maintain it longer for a straighter trajectory, and since it has a longer burn time than a D12 it might loft it to a safer height?
The E15 is still listed on Aerotech's 2018 Master Motor matrix so has it actually been dropped? The E20 is a slightly shorter motor so I didn't consider it.Remember, the E-15 does not exist any more in the previous form of 40ns, the new ones with thrust ring built in and forward ejection reservoir are rebranded E-20's which are something like 35ns. Aerotech changed them but never re-certed because their argument was they were close enough in performance. Thrustcurve still shows the old E-15 40ns performance curve.
Thanks, I had considered it until I read E9s have been discontinued.I've never had any problem with mine (built stock, bare balsa) on D12-3 and E9-4, even in mild wind. I've seen them flown on E18s and it works, not sure what delay was being used.
The current E15s are the same as the old E20s. As always, how or why Aerotech sells the same motor under two different designations remains a mystery to me.The E15 is still listed on Aerotech's 2018 Master Motor matrix so has it actually been dropped? The E20 is a slightly shorter motor so I didn't consider it.
On the NAR Certified Motors page of their website (https://www.nar.org/SandT/pdf/Aerotech/E20.pdf) they list the E20 as 24mm × 65mm instead of 70mm. Possibly a typo?The current E15s are the same as the old E20s. As always, how or why Aerotech sells the same motor under two different designations remains a mystery to me.
What do you mean about "shorter" though? The E15s I have used fit perfectly into standard 2.75" 24mm motor mounts... was the old one actually too big for that?
Obviously if it flies OK on an E9 it will fly OK on an E12 as well, although I haven't flown mine on one.Thanks, I had considered it until I read E9s have been discontinued.
Obviously if it flies OK on an E9 it will fly OK on an E12 as well, although I haven't flown mine on one.
I'm pretty sure it will fly all right on an E20, especially given your strengthening. You'll probably want to remove some of the BP as Aerotech motors tend to have larger ejection charges than Estes.
You can add a spacer for short. Long can be a bit harder to work around if you have a motor hook installed.The E12 has a nice thrust curve and some good reviews. Unfortunately my engine block is already in place to fit 70mm motors so the longer Estes E12 won't fit (and the E20 is a tad too short). If it weren't for that they both look like they would've been good candidates.
The E20 has a thrust ring and should work fine, it doesn't need a block at all. It's unfortunate that you put a block in that precludes the use of 95mm BP motors.Unfortunately my engine block is already in place to fit 70mm motors.
Here's a flight on an E9-4 just to see what typical flights look like.
Here's a flight on an E9-4 just to see what typical flights look like.
Enter your email address to join: