2025/2026 Hybrid Powerunit speculation

[gruntguru]

Just thought of something. Is it possible to replace the MGU-H with a flywheel, maybe even a mechanical one?
Do the regulations ban this?
Going further, is using the exhaust this way to store and deploy power banned?

By the way. What did they add to the regs to ban so called "split turbos"? How long can turbos be?

Flywheel has been done in the early days of regen. Don't know if the current regs permit but it wouldn't compete with MGUK plus Li battery on energy density.

[Tommy Cookers]

.. Is it possible to replace the MGU-H with a flywheel, maybe even a mechanical one?
Do the regulations ban this?
Going further, is using the exhaust this way to store and deploy power banned?

imo 'everybody knew' it was banned wef 2013/2014 ie the current rules
the Williams CVT/flywheel group (Williams Hybrid Power) were then sold in 2014 to GKN
https://www.imeche.org/news-article/wil ... n-010414-2
another https://www.racecar-engineering.com/art ... tems-kers/

[mzso]

Flywheel has been done in the early days of regen. Don't know if the current regs permit but it wouldn't compete with MGUK plus Li battery on energy density.

When I said "replace" I thought of a flywheel for the turbo to combat turbo-lag.

banned wef 2012/2013
to keep out Williams

Typical... Is it banned for drive only, or universally?

[Holm86]

Just thought of something. Is it possible to replace the MGU-H with a flywheel, maybe even a mechanical one?
Do the regulations ban this?
Going further, is using the exhaust this way to store and deploy power banned?

By the way. What did they add to the regs to ban so called "split turbos"? How long can turbos be?

Referring to Drawing 4 of Appendix C3, the turbocharger compressor and turbine must satisfy the
following dimensional constraints. Only compressor and turbine wheels approved by the FIA
Technical Department will be allowed:

a. The compressor exducer blade outer diameter (A) must lie between 100mm and 110mm. For
the avoidance of doubt, no part of the compressor wheel (including blades, hub and any
blade/hub fillet radius) can have a diameter more than the upper limit and the maximum
diameter of the compressor wheel (including blades, hub and any blade/hub fillet radius)
cannot have a diameter smaller than the lower limit.
b. The compressor axial distance from the outside diameter of the inducer blade edge to rear
plane of exducer, at its outer diameter (B) must lie between 30mm and 35mm
c.
The turbine inducer blade outer diameter (C) must lie between 90mm and 100mm. For the
avoidance of doubt, no part of the turbine wheel (including blades, hub and any blade/hub fillet
radius) can have a diameter more than the upper limit and the maximum diameter of the
turbine wheel (including blades, hub and any blade/hub fillet radius) cannot have a diameter
smaller than the lower limit.
d. The turbine axial distance from the outside diameter of the exducer blade edge to forward
plane of inducer, at its outer diameter (D) must lie between 35mm and 40mm
e.
The maximum distance between the rear of the compressor exducer and the front of the
turbine inducer (E) will be 175mm

[mzso]

Wow, reading something like this makes me think F1 should be renamed to Prescription 1.