Estes Ventris on an F15-6 Black powder

[Bill Gibson]

Has anyone tried this combo? Is this enough motor?

 

[LithosphereRocketry]

Has anyone tried this combo? Is this enough motor?

Probably, but only barely. If you have it I would go to an F15-4.

An E16 might be a better option as it's lighter at liftoff. You would definitely need a short delay fot that.

What's your dry weight? That's the main thing to think about.

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[neil_w]

For perspective, Estes doesn't recommend the F15, and you know they would love to sell you those motors. I saw a reference elsewhere that an E15 sims to 250 ft at 30 ft/sec off the rod. I wouldn't try it.

 

[Cabernut]

4 second delay under no wind conditions or no go.

I've seen a video somewhere of a Ventris on a D12-3 that happened to work once ot twice...

Forgot to mention, I've personally seen a Ventris on an F15-4 in no wind. It arced over and was a nail-biter recovery but it worked.

 

[Tonimus]

@Cabernut, probably my videos. Done it on D12-3 a bunch of times now. F15-4s are a lot of fun.

[video=youtube;YNpg_hQlH8Y]https://www.youtube.com/watch?v=YNpg_hQlH8Y[/video]

 

[Mr Rocket]

Never launched mine on BP, but it eats Aerotech F39-6 motors for lunchoint:

 

[Andy Greene]

Just put the G40 and your chute release in it Bill :wink:

 

[swatkat]

I've not done the F15, but I have done the F12 reload, which has a similar thrust curve with an adapter off a 6 foot rod. It's smoky and slow, but it does go. Would recommend no wind and long rod/rail.

 

[shreadvector]

Estes did not recommend it simply because the F15 motor did not exist when the kit was created and the instructions were written and printed.

The F15-4 is fine with ZERO wind and a 6 foot long 1/4" diameter steel launch rod. Or use a rail.

For perspective, Estes doesn't recommend the F15, and you know they would love to sell you those motors. I saw a reference elsewhere that an E15 sims to 250 ft at 30 ft/sec off the rod. I wouldn't try it.

 

[neil_w]

Estes did not recommend it simply because the F15 motor did not exist when the kit was created and the instructions were written and printed.

Interesting. That all happened while I was in Rocketry exile, somehow I assumed it was all introduced together. Thank you for the correction.

The F15-4 is fine with ZERO wind and a 6 foot long 1/4" diameter steel launch rod. Or use a rail.

Still seems dicey.

 

[Nytrunner]

Better make sure it's built very light to get passable flights on the BP 29s.

Though I shouldn't even weigh in here since mine weighs ~21oz with some 'aftermarket' construction.

Just put the G40 and your chute release in it Bill :wink:

Are you even trying? G118........annnnnnnd its gone! Half mile, M.7, some dual event required, tracker recommended lol

 

[Andy Greene]

Better make sure it's built very light to get passable flights on the BP 29s.

Though I shouldn't even weigh in here since mine weighs ~21oz with some 'aftermarket' construction.



Are you even trying? G118........annnnnnnd its gone! Half mile, M.7, some dual event required, tracker recommended lol

It was a conservative option to the BP F - He watched my scratch build fly away last launch- he is leery

 

[Bill Gibson]

Thanks EVERYBODY for all the GREAT input! It's VERY MUCH appreciated!! Andy, my Leviathon flew really good on the F44-4W at the Buc Blast as windy as it was, so I think that's what I think I will use for my Venturis maiden!
I figure the Venturis is about 2oz lighter than the Leviathon, with a Good bit less girth, so it should go a bit higher, but not outrageous! Anyone who reads this, please feel free to offer up your opinions on my choice of motor for this rocket!

 

[rstaff3]

For my Ventris, I like the G74 (a baby G) and the CTI F59. I personally wouldn't trust mine to an F15, although I have flown several rockets on F15s where the sims say are a bit slow off the rod. YMMV.

 

[Cabernut]

The E30-4 is great for a lower 450' -ish flight.

The Aerotech Economax...
A G74W-6 will get you twice the altitude as an F44 for only $1.50 more per flight.

If you have a 24/40 case, then the F39-6T is an excellent Pro Series II motor IMO.

 

[Mr Rocket]

If you have a 24/40 case, then the F39-6T is an excellent Pro Series II motor IMO.

+1 Also need a 24/29mm adapter. The Estes version is cheap and works great.

 

[LithosphereRocketry]

+1 Also need a 24/29mm adapter. The Estes version is cheap and works great.

I made one from a few scrap CRs and some scrap BT50. It is open at the front end so I can put long motors in it- probably not going to, but you never know. The other advantage is you can have a built in thrust ring- I doubled up 5055 cardstock centering rings.

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[rstaff3]

I made one from a few scrap CRs and some scrap BT50. It is open at the front end so I can put long motors in it- probably not going to, but you never know. The other advantage is you can have a built in thrust ring- I doubled up 5055 cardstock centering rings.

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I have always built my own but, now that I know Estes has one, I want it too.

 

[Tonimus]

Aerotech includes a 24-29 mm adapter in all their Economax/Econojet 29 mm motors. Cut both ends off of the plastic case. The inside diameter is about 24.5 mm in my experience.

 

[swatkat]

You can 3D print them. With PLA+ or PETG, I've had no issues on 16+ launches. They don't even get soft.