DA62 RACC system performance

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Expand view Topic review: DA62 RACC system performance

Re: DA62 RACC system performance

by janders » Thu Oct 21, 2021 5:11 pm

I photograph from my iPhone and when we're in serious photo taking mode, we remove the JetShades momentarily whilst taking photos. (I'm also usually in Chicago where there's not always a whole heck of a lot of sun but always a good crosswind on whatever runway you choose :))

Re: DA62 RACC system performance

by photoSteveZ » Thu Oct 21, 2021 1:06 am

I went with the standard JetShades for my DA62 (I'm in Colorado, where there's a whole heck of a lot of sun most days), and I'm happy with them. I've heard anecdotally that some find the Premium shades too dark and/or add a weird coloration to the outside view. The only thing that bothers me about the JetShades I have is that they're optically a bit 'wavy'. If you're not a photographer like I am, you might not even notice.

Re: DA62 RACC system performance

by UTMark » Mon Aug 30, 2021 1:40 pm

JetShades were a game changer for us… we went with the Premium Option as well.

Re: DA62 RACC system performance

by Donkadillapig » Mon Aug 30, 2021 10:24 am

Concur with Jet Shades comments and performance for the DA40NG as well!!! My a/c goes on as soon as I start the engine in steamy Virginia heat.

Re: DA62 RACC system performance

by Jroseund » Mon Aug 30, 2021 2:58 am

Choose Premium. Your rear passengers will praise you for their comfort over saving a couple of hundred $$$ by doing standard.

Re: DA62 RACC system performance

by CFIDave » Sun Aug 29, 2021 3:56 pm

I got the Premium with darker rear windows.

Re: DA62 RACC system performance

by Dean robert » Sun Aug 29, 2021 2:22 pm

For those of you that have invested in jet shades, did you do the premium package or was the standard package adequate for managing the glare/ solar heating ?

Re: DA62 RACC system performance

by ultraturtle » Sun Jan 10, 2021 10:47 pm

Concur with all of the above. JetShades are the best.

I operate the RACC system only at its maximum output (fan at the highest setting, temperature at its lowest), and have observed the same performance as Dave - zero difference in cruise speed between the system turned off and operating at max blast.

Re: DA62 RACC system performance

by CFIDave » Thu Jan 07, 2021 12:21 am

I also have JetShades for my DA62, which almost makes the under-sized (IMHO inadequate capacity) RACC air conditioning handle summertime heat and humidity on the ground. JetShades do help keep the interior cooler -- highly recommended.

Re: DA62 RACC system performance

by VickersPilot » Wed Jan 06, 2021 7:58 pm

A few points regarding RACC (for now, I speak academically, CFIDave perhaps speaks practically above).

First the aircraft can be optimised to manage heat with easy gains:

The RACC sufficiency is the ratio of [Required BTUs] to [Available BTUs]. Since one can't increase the [Available BTUs], the key is to reduce the [Required BTUs]. I have personally used Kevin Duggan's JetShades and can attest they significantly reduce the greenhouse effect in an aircraft cabin. They also improve thermal stability - removing (reflecting away) the asymmetric solar gain means the aircraft cooling or heat can be evenly distributed. In summary, using JetShades will significantly reduce the [Required BTUs] and more importantly equalises the cooling or heat in the cabin.

Then we refer to the RACC supplement:
http://support.diamond-air.at/fileadmin ... S07-r1.pdf

A few abstracts:
- Takeoff Ground Roll +60m, Takeoff Distance +100m
- Time, Fuel, Distance in Climb +6%
- Rate of Climb -70ftpm
- Cruise - 10kts

Given the above are from the AFM Supplement, one assumes that is worst case (max load on AC). So reducing the load on the AC should in theory, perhaps not in practise, reduce the performance penalties. Further, you're only likely to use the AC at full load with temperatures that are well above ISA, so if one suffers the performance penalty, it's likely to be combined with a hot weather (density alt) penalty.

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