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        Chapman and Cutler LLP

320 South Canal Street, 27th Floor

Chicago, Illinois 60606

T 312.845.3000

F 312.701.2361

www.chapman.com

December 13, 2022

Mark Cowan

U.S. Securities and Exchange Commission

Division of Investment Management

Disclosure Review Office

100 F Street, N.E.

Washington, D.C. 20549

    Re:
    FT 10447

    40/60 Portfolio Series

    (the “Trust”)

    CIK No. 1943320 File No. 333-268290

Dear Mr. Cowan:

We received your comments
regarding the Registration Statement for the above captioned Trust. This letter serves to respond to your comments.

Comments

General

1.The
Staff notes the disclosure states, “The valuation of the Securities has been determined by the Sponsor.” Please revise this
disclosure consistent with Rule 2a-5(d), which, in the case of a UIT, requires the UIT’s trustee or the UIT’s depositor to
conduct fair value determinations under the rule, or explain how the fair value determination by the Sponsor is consistent with this requirement.

Response:Rule
2a-5(d) provides, in part, “[i]f the fund is a unit investment trust . . . the fund’s trustee or depositor must carry out
the requirements of paragraph (a) of this section.” The Trust notes that First Trust Portfolios L.P. is the Trust’s “Sponsor,”
which is the term used in the Registration Statement to refer to the depositor. The Trust respectfully points the Staff to the cover page
of the S-6 filing, which states that the name of the depositor is First Trust Portfolios L.P. The Trust confirms the disclosure throughout
the Registration Statement is consistent with Rule 2a-5.

Portfolio

2. Please
clarify, if true, that the Trust seeks low risk and low volatility.

Response:The Trust does not
seek low risk and low volatility; therefore, the Trust will not include this disclosure in the “Portfolio Selection Process”
section.

3.The
Staff notes the disclosure states, “3-month price appreciation” under the “Value & International Model” section.
Please add an explanation of how this is factored into the selection process.

Response:The Trust has revised
the above-referenced disclosure as follows:

“- 3-month price appreciation. Companies
are numerically ranked by their stock’s trailing three-month price appreciation.”

4.The
Staff notes the disclosure states, “A lower, but positive, ratio indicates investors are paying less for the cash flow generated
which can be a sign of value” under the “Growth Model” section. If accurate, please revise “a sign of value”
to “a sign of growth.”

Response:The Trust notes the
disclosure, as currently presented, is accurate. The growth and value/international models are multi-factor models encompassing a variety
of factors to provide broad diversification within each sleeve. The “price-to-cash flow” factor is a commonly used metric
for classifying and valuing stocks, which can be used in making a growth determination. The research department considers the “price-to-cash
flow” metric in both models.

5.The
Staff notes the disclosure states, “6-month price appreciation” under the “Growth Model” section. Please add an
explanation of how this is factored into the selection process.

Response:The Trust has revised
the above-referenced disclosure as follows:

“- 6-month price appreciation. Companies
are numerically ranked by their stock’s trailing six-month price appreciation.”

6.Please
consider disclosing how many stocks from each model (i.e., Risk Model, Value & International Model and Growth Model) are made up of
the 30 stocks selected for the portfolio.

Response:The Trust notes the
30 stocks with the best overall ranking from each of the seven style classes are selected. Each stock is filtered through the Risk Model
and either the Value & International Model or Growth Model. Therefore, the Trust respectfully declines to revise the disclosure, as
the disclosure is appropriate for investor comprehension.

7.The
Staff notes the disclosure states, “Where relevant, we review the credit quality of the underlying securities held by the funds.”
Please clarify what is meant by “where relevant.”

Response:The Trust has revised
the above-referenced disclosure as follows:

“In evaluating the fixed income ETFs,
we also review the credit quality of the underlying securities held by the funds.”

8.The
Staff notes the disclosure states, “We prefer to avoid funds with high expenses, as well as funds with higher than average expense
ratios relative to their peers.” Please be more specific as to how these two factors are weighted.

Response:The Trust has revised
the above-referenced disclosure as follows:

“If funds are substantially similar with
regard to their fixed income characteristics, funds with lower expense ratios will be preferred.”

9.Please
consider the placement of the last two paragraphs of the “Portfolio Selection Process” section. Additionally, the Staff notes
there is risk disclosure listed in the next section which covers at least the first noted paragraph. The Staff feels the disclosure should
be in one place or the other.

Response:The disclosure has
been revised as follows:

“Please note that we applied the strategies
which make up a portion of the portfolio for the Trust at a particular time. If we create additional Units of the Trust after the Initial
Date of Deposit we will deposit the Securities originally selected by applying the strategy on the Initial Date of Deposit. This is true
even if a later application of the strategy would have resulted in the selection of different securities. The Securities were selected
as of the strategy’s selection date using closing market prices on such date or, if a particular market was not open for trading
on such date, closing market prices on the day immediately prior to the strategy’s selection date in which such market was open.
In addition, companies which, based on publicly available information as of the date the Securities were selected, are the subject of
an announced business combination which we expect will happen within 12 months of the date of this prospectus, or companies which are
subject to any of the limited circumstances which warrant removal of a Security from the Trust as described under “Removing Securities
from the Trust,” are not eligible for inclusion in a Trust’s portfolio.”

Otherwise, the Trust believes
the disclosure is appropriate for investor comprehension.

10.The
Staff notes the “Additional Portfolio Contents” section lists “foreign securities (including American Depositary Receipts,
Global Depositary Receipts and New York Registry Shares).” Please explain why this is listed when international securities, including
ADRs, are already disclosed above. The Staff believes it is confusing to suggest foreign securities are an additional investment when
a portion of the portfolio is focused on international investments.

Response:The Trust confirms
it will revise the “Additional Portfolio Contents” section to remove types of investments already disclosed in the “Portfolio
Selection Process” section.

Risk Factors

11.If
the funds held by the Trust invest in bonds that reference LIBOR, please add relevant risk disclosure.

Response:In
accordance with the Staff’s comment, if the Trust’s final portfolio has exposure to funds that invest in bonds that reference
LIBOR, appropriate disclosure will be added to the Trust’s prospectus.

12.If
the funds held by the Trust invest in subprime residential mortgage loans, please add relevant risk disclosure.

Response:In
accordance with the Staff’s comment, if the Trust’s final portfolio has exposure to funds that invest in subprime residential
mortgage loans, appropriate disclosure will be added to the Trust’s prospectus.

We appreciate your prompt attention to this Registration
Statement. If you have any questions or comments or would like to discuss our responses to your questions, please feel free to contact
Brian D. Free at (312) 845-3017 or the undersigned at (312) 845-3721.

    Very truly yours,

    Chapman and Cutler llp

    By:
    /s/ Daniel J. Fallon

    Daniel J. Fallon