irocbsa

My Feedback: (12)

It seems to be drowning it out at idle, but remember, the battery I was using was less than adequate and not able to drive the siren at high speed.

I have the siren mounted behind the firewall inside the large open area at the front of the fuse.

Regarding high speed dives, I have had the plane quite high and came screaming down, full tilt, at 90 degrees and pulled full back on the elevator without a hitch. That wing is quite strong as is.

No bomb drop yet, that's next on my list. I'd be happy to try one out.

Firepower R/C

My Feedback: (10)

When I get my laser cut parts in, I will send you a trapeze to try out. You can use the stock bomb with it, or the one I am working on right now.

Questions: Your siren horn (front) is visible from the outside, right? Does it point down while on the ground?

irocbsa

My Feedback: (12)

No, it isn't visible. I was able to install it right behind the firewall on the inside of the fuse, left hand side. It is pointing downwards when the plane is right side up. I slipped the siren in through the fuel tank opening (tank removed of course). I then used the stock siren mounts to screw it into the fuse. I have some access hatches cut out of the fuse right behind the firewall which made it easy to hold the siren against the fuse and run some screws into the siren mounts. When the cowl is on, you can't see a thing. Is that description adequate?

I can take some pics if you really need it, but as you know, it's a pain in the a** to get the spinner and cowl off.

I just wired in the 3s lipo. It's definitely loud enough.

I'll take the bomb that you're making if that's possible. The fins on the stock bomb sheared off on Sunday in flight. I have no idea where they landed.

Firepower R/C

My Feedback: (10)

Ok, it will be a week or 2 for the stuff... still waiting for some parts to come in. maybe a few holes in the bottom of the fuse would make it louder?

Ed

Is your siren loud enough to be heard over the engine while flying ? And regarding dive brakes, I have a Ziroli Stuka ( 100" span ), and have been reading Stuka forums for many years. It is the consensus of everyone who had installed dive brakes, that they are absolutely ineffective. Sorry to say, many people have tried them, and have been very disappointed. Save your money, and especially the weight of extra servos and linkage, and forget about them.



Ed

Firepower R/C

My Feedback: (10)

Thank you for the advice, Ed. I wasn't really wanting to install them unless they were really useful. I will forget about them and move on.

Great Stuka, by the way. How does that beauty fly? Is she light or heavy?

irocbsa

My Feedback: (12)

When the siren is getting a proper 12V it can be heard over the engine.

Ed

Thanks Firepower. My Ziroli Stuka weighs 28 lbs, and flys like a dream. Now that might sound heavy to most here, but 26 to 32 lbs. is the range that Ziroli's come in at. Power is a DA-50, and is more than adequate. I have that same mini siren, I think that it came from J.C. Whitney ? I have yet to mount it in the plane, and hence, my questions on loudness. One of these days I will get around to it, but right now it's flyinjg so beautiful, that I don't want to disturb it's balance. And since that photo was taken, I have added some squardron graphics on the fuselarge. Thanks for your kind remarks, and it's nice chatting with you guys here.

Ed

kahloq

Quick question....has anyone thought of mounting TWO of those sirens in a plane....A)to get more sound to be heard over an engine...B)Two motors/sirens of anything usually end up sounding a tad LOWER pitch wise because of the harmonics.

Any thoughts?

irocbsa

My Feedback: (12)

That's certainly a great idea, but I would be concerned about the weight. My siren setup easily added 1lb to the plane.

Firepower R/C

My Feedback: (10)

2 sirens: 12 ounces
2 ESCs and battery: 12 ounces
Super Duper Stuka siren sound effect: priceless

Seriously, it would add alot of weight, but at least there are no retracts to contend with. This had crossed my mind, also thinking of the harmonics... but I was concerned also about the weight.

kahloq

If these are running on BRUSHED speed controllers, then you do not need 2. Both sirens can be wired to the same speed controller and really, two batteries arent needed. You could up the mah capacity some, but you dont have to double what one setup would be.

These might be added weight, or you could plan ahead and do it so you are NOT adding dead weight balast to balance the plane.

Even if two setups equaled 2 pounds, any 80" Stuka can handle that easily. Most stukas flight rather easily without a need for super duper engine power.

My ESM 80" one had a saito 150 in it and it was over powered. I also had to add dead weight lead up front to balance. Heck, just putting in a saito 180 would give a bit more power, at a slightly lower weight
Im just spouting ideas here...I dont think 2 pounds would negatively effect a stuka of decent size much.

Firepower R/C

My Feedback: (10)

I see your point... I was thinking 2 merely because I don't have 1 ESC big enough for 2 sirens, but I definitely think one battery is enough... perhaps a 2200 mah.

irocbsa

My Feedback: (12)

Good point about the ESCs. I would need to get a bigger one though.

I would be concerned about weight on my plane. With the cockpit kit, pilot, aluminum spinner, siren, etc. it weighs 17.5 lbs dry. Not exactly a petite girl.

Firepower R/C

My Feedback: (10)

Update... I have completed a prototype "exploding" Stuka bomb, and will be testing it tomorrow. It looks pretty good, should be a good replacement if anyone needs one. I will post pictures tomorrow.

Firepower R/C

My Feedback: (10)

Here are some pics of the first Stuka "exploding" bomb prototype. I have since constructed another one that has molded in flanges on the bomb case for the bomb fins... it greatly eases assembly and is tougher, too. I will upload pics of the latest one later. I took this bomb outside and chucked it as high & far as I could, and it is tough and flies great. It also splits on impact every time.

Please, give me your thoughts.

Rich

Ed

Looks great. What do you load it with ?

Ed

Firepower R/C

My Feedback: (10)

Flower, talc, marking chalk, snap-n-pops , whatever...

Firepower R/C

My Feedback: (10)

Here is pics of the second proto in primer (half of it anyway)... notice the flanges for the fins. Better?

irocbsa

My Feedback: (12)

Looking great.

Firepower R/C

My Feedback: (10)

hey Irocbsa, any progress on the ESC mod for the siren?

Firepower R/C

My Feedback: (10)

It's been a while, but I haven't given up. New prototypes have been made with slight adjustments to shape & function, and now the bomb has the trapeze lugs fitted. This is a Sc 250 Kg bomb, FYI... not a 500 as I said earlier.

irocbsa

My Feedback: (12)

I'm still interested if you finish the project.

I now have a 50A ESC powered by a 14.4 4s 2000mAh Lipo and it really makes the siren scream.

mcjustis

Here's a picture of one I made for a friend. He's got it mounted, but not had it in the air yet. It is quite loud and my wife tells me she can hear it's annoying tone from about half a mile away. It has a brake servo on the back of the housing to stop it when not wanting it to scream. Just dropping a random post here.
Martin

irocbsa

My Feedback: (12)

Beautiful work. If you could mass produce those I'm sure there would be a market for them.