modified chipmunks

[jonesey2k]

Get yourself the DF Bonanza and then add Peter Mcleland's turbocharged engine kit. 35inches of MP up to 18000feet and 350hp Over 200kts TAS at 25000feet

[Rick Piper]

Hi Hinch

It should be very simple to change the chippy to turbocharged just by using the aircraft.cfg.

just adjust these (Bold) to get turbo

this is my guess at what you will get if you strap a turbo onto a Gypsy Major.

This gives 65 HP extra.
An Aerobatic capable carburettor.
in my view a realistic expectation of what you would achieve if the Gypsy Major was strong enough for forced induction.


[piston_engine]
power_scalar = 1.0
cylinder_displacement= 93.425 //373.7 cu in (6.124 litre)
compression_ratio= 6.0
number_of_cylinders= 4
number_of_magnetos= 2
max_rated_rpm= 2700
max_rated_hp= 210
fuel_metering_type= 2
cooling_type= 0
normalized_starter_torque = 0.3
turbocharged= 1
max_design_mp= 38
min_design_mp= 1
critical_altitude= 12000
emergency_boost_type= 0
emergency_boost_mp_offset= 0
emergency_boost_gain_offset= 0
fuel_air_auto_mixture= 0
auto_ignition= 0
max_rpm_mechanical_efficiency_scalar= 1.0
idle_rpm_mechanical_efficiency_scalar= 1.0
max_rpm_friction_scalar= 1.0
idle_rpm_friction_scalar= 1.0
magneto_order_left_right_both = 1
emergency_boost_duration=0 .0
BestPowerSpecificFuelConsumption= 0.49 //SFC at Best Power mixture ratio

Regards
Rick

[hinch]

hi rick,

thanks for that! i wouldn't have known any values hehe. i'll have a flight later and report back. i got myself a nice turbo whiney sound from avsim to add also. i could follow in mr mcleland's steps and 'bandit' it

[Kevin]

The shot gun thing is a cartridge starter, I'd have thought just about all the flying chippies have been converted to electric start as its much easier.

A friend of mine is looking into the possibility of converting his gypsy engine to electric although its not for a chippy (it is for a classic british aircraft though).

James,

You're right - I can't recall the last time I saw a cartridge-starter-equipped civil Chipmunk; I've certainly not flown one. It's quite expensive to buy the cartridges and nowadays there are practical & legal difficulties about storing and using them (firearms regulations ). Removing it was one of the changes usually made on civilianised T Mk10s.

Regarding electric starters: there are several types that can be fitted and your friend would be well advised to research availability of spares. The problem is that with a small number of aircraft and several types of starter, plus decades of use, starter parts are sometimes hard to come by. It's often the clutch that's the problem area, and it is not unusual to hand-swing the prop to save on starter/clutch life: try doing THAT in FS .


Hinch,

brakes to avoid crossover

That I don't understand. The brake lever is on the left side of the cockpit, so to use it you move your left hand from the throttle to the brake: there's no swapping hands and it's quite easy to use, even for someone brought up on toe-brakes.

What can be a bit tricky for an inexperienced pilot on the Chipmunk, is the use of carb heat and flap on a short field touch-and-go. The pilot has to move his left hand from the throttle across to the rhs of the cockpit, just under the sill, to close the carb heat, then put his left hand on the stick and simultaneously his right hand on the flap lever, all without taking his eyes off the runway ahead . Then he has to swap them back in order to open the throttle.

Cheers,

Kevin

[jamesstables]

I think the engine is still fairly low on the list of priorities as yet so not too much serious thought has been given to it. It is fair to say that hand swinging is out of the question for the type concerned.
I can't give too much away yet as he is keen to keep it quiet until we get a workshop built for the project at the museum to avoid any more spotters trying to break into his yard!