So I talked to Aerolite 103.

Discussion in '2-Stroke Aircaft Engines' started by Armilite, Jul 27, 2019.

Help Support HomeBuiltAirplanes Forum by donating:

  1. Jul 27, 2019 #1

    Armilite

    Armilite

    Armilite

    Well-Known Member

    Joined:
    Sep 6, 2011
    Messages:
    3,022
    Likes Received:
    243
    Location:
    AMES, IA USA
    So by their Info, a 277UL with the right Prop should work also. They only show a 60" & 63" Prop. A Rotax 277UL (26hp@6250rpm) with a 2.58 Redrive at 77F using a 63" x 19 Pitched for 2,322.5 rpm = 227.83 lbs Static Thrust and needs 25.474 hp!

    A Hirth F-33 (28hp@6500rpm) with a 2.5 Redrive at 77F using a 60" x 20 Pitched for 2,500 rpm = 217.18 lbs Static Thrust and needs 27.514 hp!

    Just about any of these GX270+ Honda/Clones could also be used if upgraded to make 25hp+.

    Prop Static Thrust Calc:
    http://godolloairport.hu/calc/strc_eng/index.htm

    Hi Rich.

    So with what Engine is it 235lbs?
    ==> Hirth F-33(28hp).

    What 50hp Engine does it make Part 103 254lbs?
    Hirth F-23(50hp), manual start, reduction drive, no options/upgrades. It will meet the weight limit of 278 lbs with the F23(50hp), but it will zip right past the 63 MPH.

    What is the Smallest HP Engine you have seen used?
    ==> Hirth F33(28hp)

    Here is some additional info regarding weight:
    If you use the F33 engine, the completed aircraft is 10-12 pounds under 254 without a parachute. With a chute, it is approximately 17 pounds under the 278. In either configuration, you can add pretty much whatever options/upgrades you would like and remain under 254/278.

    Using the Hirth F23(50hp), and no options/upgrades, the aircraft will come in right about 278 with a parachute. If you are not familiar with the Part 103 language, it allows you 24 pounds for a parachute system. Since the parachute system only weighs 17, you pick up that other 7 pounds which will offset the additional weight of the F23.

    Having said all that, about 98% of all UL’s are either a few pounds over the 254/278 weights, and/or go faster than 63 MPH, and nobody cares. I have personally asked guys from the FAA about a dozen times “What happens if my UL is over the weight limit.” Their response every single time has been “We have more important things to worry about.” Most owners of a single-seat UL type aircraft opt to install the engine and options they desire, and they still fly it as an Ultralight even if it is a few pounds over 254/278.


    Please let us know if you have any additional questions or need any additional information.

    Dennis

    Aerolite 103, LLC

    Magnum Parachutes, LLC

    U-FLY-IT Light Sport Aircraft, LLC


    386-738-4444 (Hangar)

    740-407-4491 (Cell / Text)

    www.fly103.com

    www.ballisticparachutes.com

    www.uflyit.com

    aerolite@uflyit.com

    magnum@uflyit.com

    sportplane@uflyit.com
    ===============================================

    From: Rich Gillen
    Sent: Thursday, July 25, 2019 11:28 PM
    To: aerolite@uflyit.com
    Subject: Spec's?

    Hello:

    So with what Engine is it 235lbs?

    What 50hp Engine does it make Part 103 254lbs?

    What is the Smallest HP Engine you have seen used?

    IF with Hirth Engines, which Configuration.

    F-33 28hp Weight: 35lbs including exhaust sys. - 40lbs W/re-drive - 45lbs W/elec. start

    F-23 50hp Weight: 78lbs, including reduction unit, full exhaust, and electric start or 71lbs with recoil start reduction unit and full exhaust

    Aerolite 103 Spec's.
    http://www.uflyit.com/aerolite_103_specifications.htm
     
  2. Jul 27, 2019 #2

    Armilite

    Armilite

    Armilite

    Well-Known Member

    Joined:
    Sep 6, 2011
    Messages:
    3,022
    Likes Received:
    243
    Location:
    AMES, IA USA
    The Hirth F-33 (28hp@6500rpm) can be Improved. It uses a Smaller Carb than the Rotax 277UL, Hirth 34mm vs Rotax 36mm. You can see where it starts to Starve for Air at 5800rpm and made Max Power at 6200rpm. This 313cc Engine should probably be making 30hp@5800rpm. The Muffler is also probably too Restricting. If you printed out this Hirth Power Graph and drew a line from HP@3500rpm to HP@5500rpm and then extended it you would see. Extend the graph lines at the different rpms up also.

    If you compare the Rotax 277UL (268cc) with a Muffler to the Hirth F-33 (28hp) with a Muffler, the 277UL actually Dynoed 25.4hp@6000rpm by R&D Aero, that comes in at 67% Volumetric Efficiency. Using 67% but Change the 268cc to 313cc and up the Rpm from 6000rpm to 6500rpm, the Hirth should make 29hp@5800rpm and 32hp@6500rpm if Carbed right and with a better Muffler! Rotax's Muffler is to Restricting for the 277UL also.

    HIRTH 28HP POWER GRAPH.jpg
     
    Last edited: Jul 28, 2019
  3. Jul 28, 2019 #3

    Armilite

    Armilite

    Armilite

    Well-Known Member

    Joined:
    Sep 6, 2011
    Messages:
    3,022
    Likes Received:
    243
    Location:
    AMES, IA USA
    You can see where the Rotax 277UL is also being affected by the Restrictive Rotax Exhaust Muffler and could maybe use a bigger carb. It was Averaging 2.8hp per every +250rpm till it reached 5500rpm then started losing HP! It made Max 25.4hp@6000rpm. If it was allowed to Breathe and make Avg +2.8hp per +250rpm at 6250rpm it should be making 31.6hp, at 6500rpm it would make 34.4hp with a Good Muffler!

    Hmmm, they wouldn't have Sold many 377UL's (35hp) if People knew their 277UL Single could make close to that 35hp. Till you can put a 277UL on a Dyno, and try a Bigger Carb, and use a less Restrictive Muffler, your guessing. My best guess is the Muffler needs to be changed. Going from Rotaxs Muffler to an R&D Aero, Mild 20% Tuned Pipe went from 25.4hp@6000rpm to 30.5hp@6250rpm. A 5.1hp difference.

    Using R&D Aero Dyno Sheet and the Peak Flow/HP Calc.
    https://www.mk5cortinaestate.co.uk/calculator3.php

    R&D Aero Stock 277UL Dyno Sheet.
    http://www.rotaxservices.com/dyno.html#13

    ROTAX 277 STOCK MUFFLER 67% CARB CFM.jpg
     
    Last edited: Jul 28, 2019
  4. Aug 3, 2019 #4

    Armilite

    Armilite

    Armilite

    Well-Known Member

    Joined:
    Sep 6, 2011
    Messages:
    3,022
    Likes Received:
    243
    Location:
    AMES, IA USA
    Aerolite 103 Virginia to Oshkosh 2019 by a 14 year old!


     
  5. Aug 18, 2019 #5

    Speedboat100

    Speedboat100

    Speedboat100

    Well-Known Member

    Joined:
    Nov 8, 2018
    Messages:
    584
    Likes Received:
    42
    Location:
    Europe
  6. Aug 19, 2019 #6

    mcrae0104

    mcrae0104

    mcrae0104

    Armchair Mafia Conspirator HBA Supporter

    Joined:
    Oct 27, 2009
    Messages:
    2,940
    Likes Received:
    1,945
    Location:
    BDU, BJC
    It is. But sadly, it has no pedals, solar panels, or thermal heat shield for re-entry.
     
  7. Aug 19, 2019 #7

    Speedboat100

    Speedboat100

    Speedboat100

    Well-Known Member

    Joined:
    Nov 8, 2018
    Messages:
    584
    Likes Received:
    42
    Location:
    Europe

    But did you know that Saturn 5 burned over 1 000 000 000 kg of fuel before reaching 10 km altitude ?
     
  8. Aug 19, 2019 #8

    mcrae0104

    mcrae0104

    mcrae0104

    Armchair Mafia Conspirator HBA Supporter

    Joined:
    Oct 27, 2009
    Messages:
    2,940
    Likes Received:
    1,945
    Location:
    BDU, BJC
    No, topspeed100, I didn't, but I'll look into it. That's a lot of pedal power.
     
  9. Aug 19, 2019 #9

    litespeed

    litespeed

    litespeed

    Well-Known Member

    Joined:
    May 21, 2008
    Messages:
    1,390
    Likes Received:
    246
    Location:
    Sydney
    That figure means 1 million tonnes of fuel?

    I do not think so.
     
  10. Aug 19, 2019 #10

    Speedboat100

    Speedboat100

    Speedboat100

    Well-Known Member

    Joined:
    Nov 8, 2018
    Messages:
    584
    Likes Received:
    42
    Location:
    Europe
    Yes sorry..there ought to be 1 000 000 kg.

    This cannot be the way to ever reach the stars with a bigger population...something more intelligent has to emerge pretty soon.
     
  11. Aug 19, 2019 #11

    mcrae0104

    mcrae0104

    mcrae0104

    Armchair Mafia Conspirator HBA Supporter

    Joined:
    Oct 27, 2009
    Messages:
    2,940
    Likes Received:
    1,945
    Location:
    BDU, BJC
    You can play dumb all you like. Everyone knows who you are, Topspeed100.
     
  12. Aug 19, 2019 #12

    Victor Bravo

    Victor Bravo

    Victor Bravo

    Well-Known Member

    Joined:
    Jul 30, 2014
    Messages:
    5,901
    Likes Received:
    4,728
    Location:
    KWHP, Los Angeles CA, USA
    The ISS space station and the capability to shuttle spacecraft parts back and forth between Earth and orbit was all originally envisioned and created to support the more efficient exploration of space, instead of multi million pound VTO rockets like Saturn V.
     

Share This Page

arrow_white