Stampede Station | 273.5m | 67s | Truman | NORR

It's about obstacle limitation surfaces - They are these big fanning areas that extend from runways into the surrounding airspace. If a building is inside the surface, it interferes with landing system signals. I believe that the rehab on 17R/35L extended the surface a bit more / creates a more restrictive glide slope.

This issue was actually known since the summer, I'm surprised it took this long to be addressed. I am no plane expert! But I do know people that work at NAV.

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How is this a problem for us, but not Toronto? Or any other city with supertalls for that matter LOL, a little frustrated but mainly curious. Does this basically make it impossible to build supertalls in Calgary, or would it just have to be elsewhere in Downtown?
 
How is this a problem for us, but not Toronto? Or any other city with supertalls for that matter LOL, a little frustrated but mainly curious. Does this basically make it impossible to build supertalls in Calgary, or would it just have to be elsewhere in Downtown?
It's not clear this is a blanket rule for all buildings in the core, or just a unique factor because of where this one is specifically located in relation to the flight path. Maybe an even taller building could in theory exist further west.

It's one of these "problems" in that it's not really a problem at all until something really outsized and unexpected comes along and runs into a new situation. I'd have to imagine that all but the tallest couple of buildings wouldn't have a common practice to give NavCan a call for comments? I think we only have 5 buildings over 200m so it's hardly a common problem to come across!
 
How is this a problem for us, but not Toronto? Or any other city with supertalls for that matter LOL, a little frustrated but mainly curious. Does this basically make it impossible to build supertalls in Calgary, or would it just have to be elsewhere in Downtown?
Exactly. Billy Bishop is much closer to Pinnacle One than this is to YYC. Maybe in Toronto they got a relaxation a long time ago?
 
Elevation YYC: 3,557 ft
Elevation dt Calgary: 3,428 ft
Distance YYC from dt: 8 km

Elevation YYZ: 569 ft
Elevation Lake Ontario Shoreline: 251 ft
Distance YYZ from dt: 20 km

So dt Calgary likely does pose more of a barrier to air traffic than would dt Toronto. That being said, Newark and LaGuardia are
way closer to Manhattan and for some reason that doesn't pose a problem. JFK is about the same linear distance away as dt Toronto is from YYZ.
 
Isn’t Billy Bishop the old Toronto Island airport? It’s right beside downtown.
The approach for Billy Bishop is over the water. It would interfere with some new development in the port lands but nothing else.
I'm assuming the OLS is also different there because it's used for smaller aircraft at sea level, so they can take a much steeper glide slope. Large aircraft at YYC have to take a much shallower approach, so the floor of the OLS probably clips East down town.
 
An ILS glideslope is usually a standard 3 degrees, exceptions are places like London City Centre that is 5.5 degrees and requires specific training and aircraft limitations that can operate into it. I do not believe Toronto Billy Bishop is not standard. Still feel this is a flimsy excuse for a height limit, that can be easily mitigated with technology today.

And no, larger aircraft do not take a shallower ILS angle than smaller aircraft. It's a precision approach for a reason, and they don't just move a dial to adjust the angle.
 
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YTZ approach is over the water and the largest planes allowed are turboprops. YYZ, I don't think any flight path goes over downtown. Flight paths are mostly over North York, Brampton/Mississauga, and on crosswind planes come in from the lake. It's probably possible for YYC to change some of this, but with all the risks already associated with such a massive project, is Truman going to take on more by trying to get changes to flight paths for slightly more height.
 
The ILS into Billy Bishop is a non-standard 4.8⁰ and requires special certification for aircraft to fly, similar to London City airport. Even the new RNAV approaches have steeper than normal descent angles. All approaches into Calgary have standard 3⁰ slopes. The approaches onto Runway 35L likely have obstacle clearance requirements that spill into the east end of downtown impacting developments such as the new hotels but wouldn't impact developments further west such as Brookfield Place.


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The balconyslop is really really horrendous. It looks super unintentional and slapped on last second, and we lose most of the interest and patterning in the original design. I can respect even trying to differentiate each tower a bit, but they've taken so much character away, it looks randomized instead of elegant, it is significantly less visually coherent and distinct.

I almost wonder, what were they expecting? Where were the balconies, observatory, etc. supposed to go in the original design? Given that these things seem to be tacked on like afterthoughts now, why were they not identified and established originally?
This new draft is a building that does not respect the space it takes up, is failing at the task of being Calgary's two tallest buildings, it will be a stinking corpse before it is born, as Jane Jacobs would say.

I even do like some of the additions, I prefer the new crowns, I like the way the observatory deck is integrated into the new design. I think one more round of refinements that take these elements and integrate them more intentionally could get us closer to the product that we deserve. Here are a few things that need to change:

I don't mind the corner balconies in theory but they look a bit unintentional at the moment, especially given how they jut out of the profile at inconsistent heights across the buildings.
The floor heights too, seem arbitrary, take a look at the SE corner at the top of the W Tower. Just why?
The stronger emphasis on the curves as they approach the bottom only serves to highlight how disjointed these curves actually are, you can clearly see 5 joints where the curves are continuous but their gradients aren't.
The worst however, are the inset balconies, these are just horrendous. Why would we copy Stantec's ugliest feature? It's even off-centre like Stantec is. This is a phenomenally bad blunder that I pray is amended before this actually breaks ground.

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Those side by sides really cement my feelings of disappointment. Especially the loss of the glass patterning and the orientation of the crowns. I wasn't crazy for the original crowns, but the orientation of sloping E-W was much more dramatic and helped the silhouettes. Since you pointed out the balconies sticking out past the building on the corner profile that's all I can see now! Ick! Worse than the inset Stantec balconies.

If there's one positive it's the liquidy looking clear glass section on the south side looping into the podium and central section. I don't mind the new crowns, but wish they had a different orientation and didn't remind me so much of West Village towers.
 
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I really dislike this view. The towers look like a blob with no definition and the corner balconies halfway up give it a very weird shape. I also think the orientation of the swoopy crown makes it look squatter and less dramatic.
 

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