• Become a Subscribing Member today!

    PiperForum.com is a vibrant community of Piper owners and pilots with over 1,500+ active members.

    Access to PiperForum.com is subscription based. Subscriptions are only $49.99/year or $6.99/month to gain access to this great community and unmatched library of Piper knowledge.

    Why become a Subscribing Member?

    • Swap technical knowledge, plan meetups and sell planes/parts.
    • We host technical knowledge of general aviation topics and specific topics on J3-Cubs, Cherokees, Comanches, Pacers and more.
    • In addition to an instant community of pilots for you, PiperForum.com is a library of technical topics, airplane builds, images, technical manuals, technical documents and more.

    Become a Subscribing Member and access PiperForum.com in full!

    Subscribe Now

IAS -> CAS calculation when not in POH

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

Pilotdaddy

Well-Known Member
Joined
Apr 15, 2020
Messages
89
Reaction score
24
Part of the CPL flight test is to be able to calculate the Vref for the aircraft. This is done with the formula below...

Vref = 1.3 * Vso (KCAS) * Sqrt (landing weight / gross weight)

I have a 1969 140B which doesn't have an IAS to CAS chart. How do I go about calculating this? I know that the utility of such a precise calculation is probably close to nil, but I just want to be able to do it if asked on the flight test.

Can I safely assume IAS=CAS for this excercise?

So, given Vso = 55mph, landing weight = 1,888 lbs, gross weight = 2,150 lbs...

Vref = 67mph?
 

Latest posts

Back
Top