Originally Posted by emessys

A few years back (2005 or 2007) Yuri attempted an air restart at Joe Nall.

About halfway thru the downline the ailerons fluttered and within a fraction of a second, the entire plane exploded.

It was very impressive.

Unfortunatley, the plane is question was a plane Yuri was demoing for one of the manufacturers at Nall.

Actually, the plane was Yuri's personal plane which was several years old (I think it was a little over 3) and had many hundreds (if not thousands) of flights on it. If you were there, you saw that Yuri is an awesome pilot who is not afraid to push his airframes to the limit. My suspicion there (I didn't see the crash, but saw the remains afterward) was that the failure was a result of accumulated stresses over the airplane's life.

My point is just that any airframe will fail, if pushed long and hard enough.

(It must have been a spectacular crash though...I'm sorry I didn't get to see it.)

Pete

Originally Posted by Howie

You need to make sure the diameter that the magnet rotates on is the same as the original hub.

And why is that important... ?

However, yes... it’s going to have same diameter and placement as original...
and the sensor will be moved to a place underneath the starter bracket...

/Perry

Originally Posted by pcastine

Actually, the plane was Yuri's personal plane which was several years old (I think it was a little over 3) and had many hundreds (if not thousands) of flights on it. If you were there, you saw that Yuri is an awesome pilot who is not afraid to push his airframes to the limit. My suspicion there (I didn't see the crash, but saw the remains afterward) was that the failure was a result of accumulated stresses over the airplane's life.

My point is just that any airframe will fail, if pushed long and hard enough.

(It must have been a spectacular crash though...I'm sorry I didn't get to see it.)

Pete

I believe you are right about it being Yuri's personal plane, now that I think about it.

I saw Yuri fly many times. In fact he used to come to my local club in Brooklyn to watch Tony Cerasani do torque rolls, which had just been "invented" . Tony was quite a pilot, and Yuri learned quickly.

The idea of carrying his plane on a rooftop rack which he mentions in the video as the inspiration for his air start routine also came from a good buddy named Bruce Roland who, to this day, transports his 35% planes to the field on the roof of his BMW. If you pass him on the highway, the prop is always freewheeling.

Originally Posted by Speedbird370

And why is that important... ?

However, yes... it’s going to have same diameter and placement as original...
and the sensor will be moved to a place underneath the starter bracket...

/Perry

Hi Perry
What Howie is referring to is the diameter of the hub that the magnet is placed on is a factor in the function of the ignition system. At a given RPM, the speed at the surface/magnet will vary depending on the diameter/circumference of the hub. With an inductive coil sensor (not Hall Effect), the speed, diameter, polarity, and strength of the magnet are critical to the correct function of the ignition system.
Hope this helps.
Thanks
Dave

Originally Posted by DATech

Hi Perry
What Howie is referring to is the diameter of the hub that the magnet is placed on is a factor in the function of the ignition system. At a given RPM, the speed at the surface/magnet will vary depending on the diameter/circumference of the hub. With an inductive coil sensor (not Hall Effect), the speed, diameter, polarity, and strength of the magnet are critical to the correct function of the ignition system.
Hope this helps.
Thanks
Dave

Hi Dave

Thanks, Very good info !
And that brings to mind another question you might be able to answer...
when looking at the engine from the front, is placement of the inductive coil sensor equally critical ?
even if I move the magnet around to match...
for example, if I place it at 6 o'clock with the sensor "looking" strait up instead of its original position at aprox 10 o'clock ?

Just remeasured the back of the new hub where the magnet will be and its indeed 0,3149 inch larger in
diameter then the original one...
It looks like I have some redesigning to do in this area to make the ignition system work like it should...
o well, back to the lathe...


/Perry

Good info and good catch!

you know this could be heaven sent for warbirds that need nose weight anyway.

Originally Posted by sweetpea

you know this could be heaven sent for warbirds that need nose weight anyway.

And not limited to warbirds only...
If the plane is tailheavy I think it’s better to use active weight, instead of a passive chunk of lead in the nose to get CG were it should be

Yes, you could move everything as far forward in the fuselage as possible…
but really, how fun is that… ?

/Perry

a new video...
tested the system with prop on today

DA 170 starter proptest (0 min 40 sec)

/Perry

That is awesome!

Nice work!

a little side project...
got tired of working on planes at floor level so something to hold it in the right height was necessary,
made of a old table and some two by four wood parts
this works great with everything from a 25% plane up to the 40%ers

/Perry

Boy i really hope this goes into production. Hell even a kickstarter campaign may be helpful for you.

What was the ring gear and donor starter originally part of?
Mark

Originally Posted by airbornrc

What was the ring gear and donor starter originally part of?
Mark

Ring gear is made in-house of high grade steel,
the only part that´s bought externally as one assembly, and then slightly modified for this application,
is the bendix gearbox, and that comes from a motorcycle starter

/Perry