Dear Sir,

The gas produced by Bacterial colony will be ejected  from spacecraft to propel it.The chemical properties of gas will decide it's ejection method.I' m preparing a complete details regarding this concept.

Here are some rough point.

(1)The food (fuel) for Bacterial colony can be recycled many times to propel the spacecraft for very long time.

(2)This Propulsion system will be very faster than Ionic Propulsion engine.As far as I think it can be 10 to 50 times but will depend on size of Bacterial colony and chemical properties of gas.

(3)There are many species of Bacterias which can survive in the extreme condition s of space.

Dear Sir,

The gas produced by Bacterial colony will be ejected  from spacecraft to propel it.The chemical properties of gas will decide it's ejection method.I' m preparing a complete details regarding this concept.

Here are some rough point.

(1)The food (fuel) for Bacterial colony can be recycled many times to propel the spacecraft for very long time.

(2)This Propulsion system will be very faster than Ionic Propulsion engine.As far as I think it can be 10 to 50 times but will depend on size of Bacterial colony and chemical properties of gas.

(3)There are many species of Bacterias which can survive in the extreme condition s of space.

Right !

Nothing comes from Nothing

Dear Arthur Sir,

I know about it .but I want to tell you that the food for Bacterial colony will be in solid form or liquid form but it means not that the whole food will be converted into gas by Bacterial colony.the bacteria will also produce waste by product as a solid and liquid  form and this waste will be recycled and destroyed bacteria will also work as a food for Bacterial colony.

It will take some time to prepare the concept completely.

The gas (propellent) will be also a waste product of Bacterial colony.

The gas produced by Bacterial colony will be ejected from spacecraft to propel it.The chemical properties of gas will decide it's ejection method.

So essentially, mass taken on board the spacecraft before its journey begins will be gradually ejected. In that regard, it is no different to an ion propulsion system or indeed a chemical rocket burn. The vital question about your idea is: how efficient is it compared to these standard propulsion methods?

Ion propulsion has been shown to be > 90% efficient. Would bringing a certain mass of ion propellant not make more sense than bringing the same mass of nutrients for bacteria?

Dear Ray Butler Sir.

I want to know suppose if Hydrogen+Oxygen mixture is ejecting from the spacecraft without blasting then  will it create same thrust than the thrust created after blasting the mixture.which way will work to increase the velocity of spacecraft?

Vikram, much greater thrust is achieved by burning the Hydrogen+Oxygen mixture - the  gas pressure is far higher in an exhaust plume.

Vikram,

Ray is correct. An efficient rocket has the exhaust moving as quickly as possible (conserve momentum - you want high thrust, right?) so simply ejecting unburned propellant and oxidant is a very unwise thing to do.

An interesting concept.  You might need to bioengineer the bacteria to provide the resilience and gas production needed.  Various bacteria will survive the radiation and temperature extremes, but will not be produce gas when conditions fall out of their active growth ranges for temperature, humidity, substrate and nutrient cofactor availability, or waste levels. You may want to consider mixed cultures rather than axenic ones.

Storing and pressurizing the gas for better control of release is desirable, but will need some design.

Dear Brian Lee Sir,

I agree with you but I have already mentioned that it will take some time to me to present the 

design completely. I' m considering every step in this concept.