E Sessanta

[Doc James Hammond]

Hi Doc, sorry for the rant this morning

Michael

Didn't see any Rant, Michael. I'm looking forward to seeing how you patch up your S60

Doc.

 

[fastchop]

Whoa don’t get me wrong Michael. I’m not accusing. Talk to Wayne about a new wing to get you up again

Michael

 

[fastchop]

Hummmm

Till I can learn to paint

 

[fastchop]

Remaidened today things went very well. I had to dodge thunderstorms. I did 4 launches, no crashes.

 

[fastchop]

Well the smooth release of spars made for easy repair. The crack was only in the outer FRP layer the foam and the inner foam good. I put a 64th birch plywood, doubler inside. Stop drilled the crack, lower side of leding edge.

 

[Doc James Hammond]

Great job, Michael - glad to hear the flying went OK.

Doc.

 

[fastchop]

Hi, I have been out flying two time since last update. And have several more flights on Sess60. It’s a fun plane, I have gotten used to it. If I get too slow with a wing tipped, it does like to stall. I was probably under 20 feet when I had that incident. And so I fly it and I make it do it and it recovers pretty easily. It’s pretty nice flying plane. it does take up some real estate pretty fast. The motor is about 600 watts It will move it.

Michael

 

[smirkracing2024]

Hi, I have been out flying two time since last update. And have several more flights on Sess60. It’s a fun plane, I have gotten used to it. If I get too slow with a wing tipped, it does like to stall. I was probably under 20 feet when I had that incident. And so I fly it and I make it do it and it recovers pretty easily. It’s pretty nice flying plane. it does take up some real estate pretty fast. The motor is about 600 watts It will move it.

Michael

@fastchop Can you say a bit more about the stalls? I am reading that this plane is about 1150g AUW ready to fly. Is yours about in that range? If so, that doesn't sound too heavy for a 1.5m wingspan plane. I have planes with similar specs which are not at all stall-prone. Just curious, as this plane has caught my eye.

 

[fastchop]

Hi smirk, with Mine CG seem to be the biggest issue for the stall once I got center gravity well before 70 it did smooth it up. Keep elevator throws low specially for up. I was having a lot of radio issues with the first generation Taranis. check through My thread flatlander few more updates in it.

 

[Wayne]

I have flown all of Hammonds planes except the 5 meter. They can all be pushed into a stall, like most every good glider, but it is never a surprise when the plane is correctly tuned, it is just a byproduct of letting the plane slow down and pushing a little too hard to gain altitude. These are planes that prefer to keep their noses slightly down and maintaining speed. They are not thermal ships. When they do stall due to low speed climbing, they will typically dop one wing or the other, and you can relax the elevator and they recover quickly.

I consider his gliders very sporty and good fun flying models. Correct elevator throw is important on his and pretty much all high performance models. Seems this is my mantra recently.

A rear CG and less elevator is often times the sweet spot. The further back we push the CG the better the airfoils can perform, but as we push that CG back, YOU also need to reduce the elevator throws. Hammond's planes all like a rear CG.

When you have a very light model or a model with a forward CG you can get away with large elevator throws, but tuning this way IMHO is a poor practice, and does not let the airframe perform to its potential. Pretty much EVERY full scale human carrying aircraft has a very forward CG. They are PIGS, but they are more focused on predictable and rather idiot proof flying to keep humans safe. When you look at parts of full scale aviation where pilots are starting to race them, or perform to a high level (STOL comps, acrobatics) we will see the common step of setting the planes up with rearward CGs, but the pilots need to be aware of what this could mean for them, reducing the safety envelope.

 

[fastchop]

Hi Wayne, sounds about right too me.

 

[fastchop]

Haven’t been on much haven’t had any problems lately either flying on archers no problems at all

 

[Wayne]

That is great to hear.

 

[smirkracing2024]

I have flown all of Hammonds planes except the 5 meter. They can all be pushed into a stall, like most every good glider, but it is never a surprise when the plane is correctly tuned, it is just a byproduct of letting the plane slow down and pushing a little too hard to gain altitude. These are planes that prefer to keep their noses slightly down and maintaining speed. They are not thermal ships. When they do stall due to low speed climbing, they will typically dop one wing or the other, and you can relax the elevator and they recover quickly.

I consider his gliders very sporty and good fun flying models. Correct elevator throw is important on his and pretty much all high performance models. Seems this is my mantra recently.

A rear CG and less elevator is often times the sweet spot. The further back we push the CG the better the airfoils can perform, but as we push that CG back, YOU also need to reduce the elevator throws. Hammond's planes all like a rear CG.

When you have a very light model or a model with a forward CG you can get away with large elevator throws, but tuning this way IMHO is a poor practice, and does not let the airframe perform to its potential. Pretty much EVERY full scale human carrying aircraft has a very forward CG. They are PIGS, but they are more focused on predictable and rather idiot proof flying to keep humans safe. When you look at parts of full scale aviation where pilots are starting to race them, or perform to a high level (STOL comps, acrobatics) we will see the common step of setting the planes up with rearward CGs, but the pilots need to be aware of what this could mean for them, reducing the safety envelope.

Thanks for all the details @Wayne . I have been window shopping for the Sessanta and I like it.

Do you have pics or links for the exact models you have in stock (in terms of livery). I think the text description on the site and the photos don't match up one for one.

 

[Wayne]

We will get those taken today when the sun pops out.

 

[Wayne]

Photos and names corrected.

 

[smirkracing2024]

Thanks! I am going to spec all everything I need for this plane. Much appreciated.

 

[Doc James Hammond]

I have flown all of Hammonds planes except the 5 meter. They can all be pushed into a stall, like most every good glider, but it is never a surprise when the plane is correctly tuned, it is just a byproduct of letting the plane slow down and pushing a little too hard to gain altitude. These are planes that prefer to keep their noses slightly down and maintaining speed. They are not thermal ships. When they do stall due to low speed climbing, they will typically dop one wing or the other, and you can relax the elevator and they recover quickly.

I consider his gliders very sporty and good fun flying models. Correct elevator throw is important on his and pretty much all high performance models. Seems this is my mantra recently.

A rear CG and less elevator is often times the sweet spot. The further back we push the CG the better the airfoils can perform, but as we push that CG back, YOU also need to reduce the elevator throws. Hammond's planes all like a rear CG.

When you have a very light model or a model with a forward CG you can get away with large elevator throws, but tuning this way IMHO is a poor practice, and does not let the airframe perform to its potential. Pretty much EVERY full scale human carrying aircraft has a very forward CG. They are PIGS, but they are more focused on predictable and rather idiot proof flying to keep humans safe. When you look at parts of full scale aviation where pilots are starting to race them, or perform to a high level (STOL comps, acrobatics) we will see the common step of setting the planes up with rearward CGs, but the pilots need to be aware of what this could mean for them, reducing the safety envelope.

Wayne is entirely correct here. The elevators can be a bit sensitive on my models simply because they are designed to be. The aerofoil I designed for the tailplanes (10%) and the main wing areas (8%) are both high-response sections and were designed as part of an outside Aeroic Composites contract that just happens to be suitable for model gliders. "High Response" means that they don't need as much deflection to work as other sections might, and at 10% (wow!) thickness (Tailplanes), the drag is actually lower than all of the more common 8% sections when the elevators are deflected.

Generally, in thermal climbing and also very much on landings, because the wing planform/section distribution is designed to have a very high potential speed, this also means that it is very forgiving, and that's because the lift is placed where it needs to be and nowhere else. For example, having a lot of lift towards the wingtips (I call this an "Oar" wing) is really no use, as it's not needed there, but can also cause stalls and general bad behaviour as the wing can be said to be unbalanced for its light envelope.

The latest in this development is actually a small step backwards in the new Toccata design, which I did to replace the Typhoon - still going strong - but with technology I developed over 20 years ago now. This all-new model is a compact 2 metre (80 design, and to some might look a little alien if "conventional" technology thinking is followed.

But I can tell you that with this wing shape and section type, it could just be the fastest 2M currently available - and yet it still has perfect manners.

Here is Ryan Jensen with the Toccata.

Cheers,

Doc.

 

[fastchop]

Good morning well I have to say losing my Sessanta was sad. My other thread flatlander explain that if y’all have read through that one. I have a replacement coming could be an upgrade. It’ll be a Toccata. It Will be here monday. Yes it will be powered.

 

[fastchop]

Hey Wayne, the grass pitcure is from your site, but the disassembled plane is from another forum. It was a good deal as far as the money and getting it to me. I will be sending you an order servos