# Isaac spitfire

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#### Darren finlay

##### Member
Hi all, Thanks for the kind welcome to your group. It's that time of year when I get out my Isaac Spitfire plans,do many sketches and calculations and then put them away again.
Having been spurred on by Bill Pratt's Spit and not wanting to break tradition the plans are out again.
The same stuff comes to mind, retracts,Flaps, Mini Merlin etc,etc ,though this time I am considering a shopping list.
Many people on the replica spitfire site have said that the retracts are not possible though my calculations seem to suggest they are.
So my first job is a mock up of the main spar and ribs around the U/C mounting points to prove it all fits.
The Isaac plans have been bounced around for years, with most common complaint being its too small, though for me this means a project that I can realistically afford to finish, not a £200,000 monster that I will never afford the engine for, let alone finish

I am lucky enough to fly a J3L4 from my back garden, so there is no need to rush the little spit, though "Low and Slow" doesn't always get the blood flowing.
At the moment the plan is to finish the Spit as a Seafire47.

Regards Darren
CAA Licence A&C airplanes1

#### topspeed100

##### Banned
Welcome aboard Darren Finlay !

Isaacs Spitfire is very sporty aeroplane. I just named my design a SPITFIRE II for the semielliptical wing made it really look like one etherically.

I have no idea how big the Isaacs Spit is but this little byrd here is now 5 m2 winged.

#### Autodidact

##### Well-Known Member
Speaking of Mini Merlins, I think an Autoflight universal PSRU adapted to a 3.0L Ford duratec v6 would be just about right - about 125-130 hp. All of this (retracts etc.) adds weight, though, but maybe not much if done well...

Someone should design a Sea Fury along the lines of the Isaacs Spit for M14 power!

##### Well-Known Member
HBA Supporter
Welcome! You have found a smart and talented group here.

Any time of year should be good for rolling out Isaac Spitfire plans! I have always been a big fan of his Spit and Fury. Since only a few Spits have been built, I haven't read as much about it as the Fury, but it sure looks like fun! I have sometimes wondered if the Cjetcovik retractable gear would fit, if adapted for the correct geometry. I have a set of the landing gear plans in my "maybe someday" file. Are you thinking of swinging them "inside out" like the originals?

regards, Harry

S

#### SpitfireBuilder91

##### Guest
I still have my plans for the Isaacs - wonder if I can build it in time for the 100th anniversary of the Spit's first flight??

Anyway, maybe this will inspire some folks - and it DOES look good with the sprung aluminium undercarriage...